US20080258196A1 - Semiconductor structure of a display device and method for fabricating the same - Google Patents
Semiconductor structure of a display device and method for fabricating the same Download PDFInfo
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- US20080258196A1 US20080258196A1 US12/020,598 US2059808A US2008258196A1 US 20080258196 A1 US20080258196 A1 US 20080258196A1 US 2059808 A US2059808 A US 2059808A US 2008258196 A1 US2008258196 A1 US 2008258196A1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body
- H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
- H01L27/1248—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs with a particular composition or shape of the interlayer dielectric specially adapted to the circuit arrangement
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/136213—Storage capacitors associated with the pixel electrode
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/02—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier
- H01L27/12—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body
- H01L27/1214—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
- H01L27/1255—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components specially adapted for rectifying, oscillating, amplifying or switching and having at least one potential-jump barrier or surface barrier; including integrated passive circuit elements with at least one potential-jump barrier or surface barrier the substrate being other than a semiconductor body, e.g. an insulating body comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs integrated with passive devices, e.g. auxiliary capacitors
Definitions
- the invention relates to a display device and method for fabricating the same and more particularly to a pixel capacitor structure of a display device and method for fabricating the same.
- a new structure capable of increasing storage capacitance without sacrificing the aperture ratio of a pixel, or maintaining the storage capacitance while increasing the aperture ratio of a pixel is desirable.
- a semiconductor structure of a display device comprises: a substrate with a thin film transistor region and a pixel capacitor region; a thin film transistor, a source electrode plug and a drain electrode plug formed on the thin film transistor region of the substrate, wherein the thin film transistor comprises a gate electrode, a source electrode, a drain electrode, a channel, and a gate dielectric layer, and the source electrode plug and the drain electrode plug electrically connected to the source electrode and the drain electrode, respectively; and a pixel capacitor formed on the pixel capacitor region of the substrate, wherein the pixel capacitor comprises a bottom electrode formed on a bottom dielectric layer, an interlayer dielectric layer formed on the substrate and the bottom electrode, a top electrode formed on the interlayer, dielectric layer, wherein the top electrode electrically connects to the bottom electrode, a capacitor dielectric layer formed on the substrate and the top electrode, and a transparent electrode formed on the capacitor dielectric layer over the top electrode and electrically connected to the drain electrode plug.
- a pixel capacitor structure comprises: a semiconductor layer formed on a substrate; a bottom dielectric layer formed on the semiconductor layer; a bottom electrode formed on the bottom dielectric layer; an interlayer dielectric layer formed on the bottom electrode; a top electrode formed on the dielectric layer and electrically connected to the bottom electrode via a first plug, wherein the first plug passes through the interlayer dielectric layer; a capacitor dielectric layer formed on the top electrode; a planarization layer formed on the capacitor dielectric layer and an opening exposing the capacitor dielectric layer directly over the top electrode; and a transparent electrode formed on the capacitor dielectric layer directly over the top electrode, wherein the transparent electrode electrically connects to the semiconductor layer via a second plug.
- An exemplary embodiment of a method for fabricating the semiconductor structure of the display device comprises: providing a substrate with a thin film transistor region and a pixel capacitor region; forming a first semiconductor layer on the thin film transistor region of the substrate; forming a gate dielectric layer on the substrate; forming a gate electrode on the gate dielectric layer within the thin film transistor region and a bottom electrode on the gate dielectric layer within the pixel capacitor region; performing a heavily doped ion implantation on the first semiconductor layer to form a source electrode and a drain electrode, and performing a light doped ion implantation on the first semiconductor layer to form a light doped region, wherein the undoped first semiconductor layer is defined as a channel region; forming an interlayer dielectric layer on the substrate, forming; first and second contact holes respectively exposing the source electrode and the drain electrode and a third contact hole exposing the bottom electrode; forming a source electrode plug and a drain electrode plug passing through the first and second contact holes
- FIGS. 1 a - 1 i are sectional diagrams of the method for fabricating a semiconductor structure of display device according to an embodiment of the invention.
- FIG. 2 is a sectional diagram of a semiconductor structure of a display device according to another embodiment of the invention.
- FIG. 3 is a sectional diagram of a semiconductor structure of a display device according to yet another embodiment of the invention.
- FIGS. 1 a to 1 i show the steps of a method for fabricating a semiconductor structure of a display device according to an embodiment of the invention.
- a substrate 10 with thin film transistor region 12 and a pixel capacitor region 14 is provided.
- the substrate 10 can be transparent substrate, such as glass substrate or plastic substrate.
- the substrate 10 has a first semiconductor layer 16 on the thin film transistor region 12 and a second semiconductor layer 18 on the pixel capacitor region 14 .
- the first semiconductor layer 16 and the second semiconductor layer 18 can be of the same material and formed by the same process. Suitable materials of the first and second semiconductor layers can be polycrystalline silicon or amorphous silicon.
- a heavily doped ion implantation is performed to the first semiconductor layer 16 to form a source electrode (heavily doped region) 21 , a drain electrode (heavily doped region) 22 .
- a gate dielectric layer 27 bottom dielectric layer
- a gate electrode 28 is formed on the gate dielectric layer 27 over a channel region. It should be noted that the plane area of the gate electrode 28 is smaller than that of the channel region 20 .
- a conductive layer is formed on the gate dielectric layer 27 of the pixel capacitor region 14 , serving as a bottom electrode 29 .
- a lightly doped ion implantation is performed to the first semiconductor layer 16 to form lightly doped regions 23 .
- the second semiconductor layer 18 is simultaneously subjected to the heavily doped ion implantation to form a heavily doped semiconductor layer 25 .
- the source electrode 21 , the drain electrode 22 , and the heavily doped semiconductor layer 25 are formed by heavily doped ion implantation with one photo-mask.
- the lightly doped regions 23 are formed by lightly doped ion implantation with the gate electrode 28 serving as a mask.
- the source electrode 21 and drain electrode 22 can be formed by heavily doped ion implantation with the gate electrode 28 as mask.
- the gate electrode 28 is etched to be reduced and the first semiconductor layer is subjected to a lightly doped ion implantation with the reduced gate electrode 28 serving as a mask.
- the gate electrode 28 and the bottom electrode 29 are of the same material and formed by the same process. Suitable materials of the gate electrode 28 and the bottom electrode 29 can be Mo, W, Al, Ti, Cr, and combinations thereof.
- the gate dielectric layer 27 comprises a dielectric layer, with a material such as silicon oxide, with a thickness between 50 nm ⁇ 200 nm, for example 100 mn.
- the interlayer dielectric layer 30 can comprise a first dielectric layer 31 and a second dielectric layer 32 , wherein the first dielectric layer 31 can be silicon oxide or silicon nitride with a thickness between 50 nm to 300 nm, and the second dielectric layer 32 can silicon oxide or silicon nitride with a thickness between 50 nm to 300 nm.
- the interlayer dielectric layer 30 and the gate dielectric layer 27 are patterned to form a first contact hole 41 and a second contact hole 42 passing through the interlayer dielectric layer 30 and the gate dielectric layer 27 respectively exposing the source electrode 21 and the drain electrode 22 , and a third contact hole 43 passing through the dielectric layer 30 exposing the surface of the bottom electrode 29 .
- a conductive layer (not shown) is formed on the substrate 10 and fills the first contact hole 41 , the second contact hole 42 , and the third contact hole 43 .
- the conductive layer is patterned to form a source line (not shown), a source electrode plug 44 and a drain electrode plug 45 , respectively, electrically connected to the source electrode 21 and drain electrode 22 via the first and second contact hole 41 and 42 .
- a top electrode 46 is simultaneously formed and, electrically connects through the third contact hole 43 to the bottom electrode 29 via the plug 47 .
- the bottom electrode 29 and the top electrode 46 comprises a first capacitor electrode with a first electric potential.
- the top electrode 46 and the bottom electrode 29 can be the same or different material and comprises Mo (molybdenum), W (tungsten), Al (aluminum), Ti (titanium), Cr (chromium), alloy, or multi-layer structure thereof.
- the capacitor dielectric layer 50 can be dielectric material, such as oxide-containing silicon, nitride-containing silicon, or multi-layer structure with a thickness between 50 nm to 200 nm, for example 100 nm.
- the planarization layer 55 can be organic material, such as polymer material, with a thickness of 2000 nm ⁇ 4000 nm and formed by spin-coating, printing or screen printing.
- the planarization layer 55 is patterned by a photo-mask to form a fourth contact hole 61 over the drain electrode plug 45 and a first opening 62 over the top electrode 46 .
- the patterned planarization layer 55 has different thicknesses.
- the planarization layer 55 over the drain electrode plug 45 is completely removed to form a contact hole 61 exposing the capacitor dielectric layer 50 over the drain electrode plug 45 .
- the unpatterned planarization layer 55 has a first thickness t 1 .
- the planarization layer 55 on the top electrode 46 is partially removed to remain a planarization layer 56 with a second thickness t 2 .
- the first thickness t 1 can be between 2000 nm ⁇ 4000 nm
- the second thickness t 2 can be 200 nm ⁇ 500 nm.
- the photo-mask for forming the fourth contact hole 61 and the first opening 62 can be a halftone mask or Gray-tone mask.
- the capacitor dielectric layer 50 and the planarization layer 55 are etched by anisotropic etching with the patterned planarization layer 55 serving as a mask, forming a fifth contact hole 71 passing through the capacitor dielectric layer 50 and the planarization layer 55 exposing the drain electrode plug 45 , and a second opening 72 passing through the planarization layer 55 exposing the surface 73 of the capacitor dielectric layer 50 formed on the top electrode 46 .
- the planarization layer 56 with the second thickness t 2 can be removed during the anisotropic etching procedure, and the planarization layer 55 with the first thickness can be etched so that the planarization layer 55 ′ on the capacitor dielectric layer 50 outside the fifth contact hole 71 and the second opening 72 remains.
- a transparent conductive layer is formed on the capacitor dielectric layer 50 and filled into the fifth contact hole 71 and the second opening 72 , serving as pixel electrode 80 , thus fabrication of a semiconductor structure of a display device with high capacity storage is completed, requiring at least six photolithography steps according to the embodiment.
- the pixel electrode 80 is electrically connected to the drain electrode 22 via the drain electrode plug 45 .
- the pixel electrode 80 formed in the second opening 72 and the heavily doped second semiconductor layer 25 comprises a second capacitor electrode with a second electrical potential.
- the transparent electrode can comprise ITO (indium tin oxide), IZO (indium zinc oxide), AZO (aluminum zinc oxide), ZnO (zinc oxide), GaN (gallium nitride), GaInN (gallium indium nitride), CdS (cadmium sulfide), ZnS (zinc sulfide), CdSe (cadmium selenide), or ZnSe (zinc selenide).
- ITO indium tin oxide
- IZO indium zinc oxide
- AZO aluminum zinc oxide
- ZnO zinc oxide
- GaN gallium nitride
- GaInN gallium indium nitride
- CdS cadmium sulfide
- ZnS zinc sulfide
- CdSe cadmium selenide
- ZnSe zinc selenide
- the pixel capacitor of the invention can comprise: a second semiconductor layer 25 formed on the substrate 10 ; a bottom dielectric layer (gate dielectric layer) 27 formed on the second semiconductor layer 27 ; a bottom electrode 29 formed on the bottom dielectric layer 27 ; an interlayer dielectric layer 30 formed on the bottom electrode 29 ; a plug 47 passing through the dielectric layer 30 and contact to bottom electrode 29 ; a top electrode 46 formed on the dielectric layer 30 and electrically connected to the bottom electrode 29 via the plug 47 ; the capacitor dielectric layer 50 formed on the top electrode 46 ; the planarization layer 55 formed on the capacitor dielectric layer 50 with a second opening 72 exposing the capacitor dielectric layer 50 directly over the top electrode 46 ; and the transparent electrode 80 formed on the capacitor dielectric layer 50 over the top electrode 46 , wherein the transparent electrode 80 electrically connects to the drain electrode 22 and the second semiconductor layer 25 via the drain electrode plug 45 .
- the pixel capacitor comprises a pixel electrode, thereby increasing the capacity storage without reducing the area of the display area (pixel electrode area).
- the first capacitor electrode and the second capacitor electrode comprise two capacitors in different locations. Therefore, the capacity storage can be increased and the aperture rate of the pixel electrode can be kept.
- a heavily doped semiconductor layer can be simultaneously formed to increase capacity storage of the capacitor when forming the source electrode and drain electrode by heavily doped ion implantation.
- the second semiconductor layer can also be an undoped semiconductor layer 33 , and the thickness and material of the capacitor dielectric layer 50 can be modified to increase capacity storage.
- the pixel capacitor can also only consist of the top electrode 46 and the pixel electrode 80 , and the thickness and material of the capacitor dielectric layer 50 can be modified to increase capacity storage.
Abstract
A semiconductor structure of a display device and the method for fabricating the same are provided. The semiconductor structure is formed on a substrate having a TFT region and a pixel capacitor region thereon. A TFT, including a gate electrode, a source electrode, a drain electrode, a channel layer, and a gate insulating layer, is formed on the TFT region of the substrate. A pixel capacitor is formed on the pixel capacitor region, wherein the pixel capacitor comprises a bottom electrode formed on a bottom dielectric layer, an interlayer dielectric layer formed on the bottom electrode, a top electrode formed on the interlayer dielectric layer, a contact plug passing through the interlayer dielectric layer and electrically connected to the top and bottom electrodes, a capacitor dielectric layer formed on the top electrode, a transparent electrode formed on the capacitor dielectric layer and electrically connected to the drain electrode.
Description
- 1. Field of the Invention
- The invention relates to a display device and method for fabricating the same and more particularly to a pixel capacitor structure of a display device and method for fabricating the same.
- 2. Description of the Related Art
- With increasing resolution of LCDs, it has become important to increase the aperture ratio of each pixel for improved performance. To increase the aperture ratio, the plane area of the storage capacitor must be reduced, and the occupied area of pixel electrodes must be enlarged as much as possible. Nevertheless, for TFT-LCD displays, as resolution increases, requirements for reducing the pixel size and plane area of the storage capacitor result in problems such as flickering, low color contrast and cross-talk.
- Accordingly, a new structure capable of increasing storage capacitance without sacrificing the aperture ratio of a pixel, or maintaining the storage capacitance while increasing the aperture ratio of a pixel is desirable.
- An exemplary embodiment a semiconductor structure of a display device comprises: a substrate with a thin film transistor region and a pixel capacitor region; a thin film transistor, a source electrode plug and a drain electrode plug formed on the thin film transistor region of the substrate, wherein the thin film transistor comprises a gate electrode, a source electrode, a drain electrode, a channel, and a gate dielectric layer, and the source electrode plug and the drain electrode plug electrically connected to the source electrode and the drain electrode, respectively; and a pixel capacitor formed on the pixel capacitor region of the substrate, wherein the pixel capacitor comprises a bottom electrode formed on a bottom dielectric layer, an interlayer dielectric layer formed on the substrate and the bottom electrode, a top electrode formed on the interlayer, dielectric layer, wherein the top electrode electrically connects to the bottom electrode, a capacitor dielectric layer formed on the substrate and the top electrode, and a transparent electrode formed on the capacitor dielectric layer over the top electrode and electrically connected to the drain electrode plug.
- According to another embodiment of the invention, a pixel capacitor structure comprises: a semiconductor layer formed on a substrate; a bottom dielectric layer formed on the semiconductor layer; a bottom electrode formed on the bottom dielectric layer; an interlayer dielectric layer formed on the bottom electrode; a top electrode formed on the dielectric layer and electrically connected to the bottom electrode via a first plug, wherein the first plug passes through the interlayer dielectric layer; a capacitor dielectric layer formed on the top electrode; a planarization layer formed on the capacitor dielectric layer and an opening exposing the capacitor dielectric layer directly over the top electrode; and a transparent electrode formed on the capacitor dielectric layer directly over the top electrode, wherein the transparent electrode electrically connects to the semiconductor layer via a second plug.
- Methods for fabricating a semiconductor structure of a display device are provided. An exemplary embodiment of a method for fabricating the semiconductor structure of the display device comprises: providing a substrate with a thin film transistor region and a pixel capacitor region; forming a first semiconductor layer on the thin film transistor region of the substrate; forming a gate dielectric layer on the substrate; forming a gate electrode on the gate dielectric layer within the thin film transistor region and a bottom electrode on the gate dielectric layer within the pixel capacitor region; performing a heavily doped ion implantation on the first semiconductor layer to form a source electrode and a drain electrode, and performing a light doped ion implantation on the first semiconductor layer to form a light doped region, wherein the undoped first semiconductor layer is defined as a channel region; forming an interlayer dielectric layer on the substrate, forming; first and second contact holes respectively exposing the source electrode and the drain electrode and a third contact hole exposing the bottom electrode; forming a source electrode plug and a drain electrode plug passing through the first and second contact holes to electrically contact the source electrode and the drain electrode, respectively; forming a top electrode electrically contacted to the bottom electrode via the third contact hole; sequentially forming a capacitor dielectric layer and a planarization layer on the substrate; patterning the capacitor dielectric layer and the planarization layer to form a fourth contact hole passing through the capacitor dielectric layer and the planarization layer exposing the drain electrode plug and an opening passing through the planarization layer exposing the capacitor dielectric layer directly over the top electrode; and forming a pixel electrode filled the fourth contact hole and the opening and electrically connected to the drain electrode.
- A detailed description is given in the following embodiments with reference to the accompanying drawings.
- The invention can be more fully understood by reading the subsequent detailed description and examples with references made to the accompanying drawings, wherein:
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FIGS. 1 a-1 i are sectional diagrams of the method for fabricating a semiconductor structure of display device according to an embodiment of the invention. -
FIG. 2 is a sectional diagram of a semiconductor structure of a display device according to another embodiment of the invention. -
FIG. 3 is a sectional diagram of a semiconductor structure of a display device according to yet another embodiment of the invention. - The following description is of the best-contemplated mode of carrying out the invention. This description is made for the purpose of illustrating the general principles of the invention and should not be taken in a limiting sense. The scope of the invention is best determined by reference to the appended claims.
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FIGS. 1 a to 1 i show the steps of a method for fabricating a semiconductor structure of a display device according to an embodiment of the invention. - First, referring to
FIG. 1 a, asubstrate 10 with thinfilm transistor region 12 and apixel capacitor region 14 is provided. Thesubstrate 10 can be transparent substrate, such as glass substrate or plastic substrate. Thesubstrate 10 has afirst semiconductor layer 16 on the thinfilm transistor region 12 and asecond semiconductor layer 18 on thepixel capacitor region 14. Thefirst semiconductor layer 16 and thesecond semiconductor layer 18 can be of the same material and formed by the same process. Suitable materials of the first and second semiconductor layers can be polycrystalline silicon or amorphous silicon. - Next, referring to
FIG. 1 b, a heavily doped ion implantation is performed to thefirst semiconductor layer 16 to form a source electrode (heavily doped region) 21, a drain electrode (heavily doped region) 22. Next, a gate dielectric layer 27 (bottom dielectric layer) is blanketly formed on thesubstrate 10, and agate electrode 28 is formed on the gatedielectric layer 27 over a channel region. It should be noted that the plane area of thegate electrode 28 is smaller than that of thechannel region 20. A conductive layer is formed on the gatedielectric layer 27 of thepixel capacitor region 14, serving as abottom electrode 29. Next, a lightly doped ion implantation is performed to thefirst semiconductor layer 16 to form lightly dopedregions 23. Further, when performing the heavily doped ion implantation on thefirst semiconductor layer 16, thesecond semiconductor layer 18 is simultaneously subjected to the heavily doped ion implantation to form a heavily dopedsemiconductor layer 25. In an embodiment of the invention, thesource electrode 21, thedrain electrode 22, and the heavily dopedsemiconductor layer 25 are formed by heavily doped ion implantation with one photo-mask. The lightly dopedregions 23 are formed by lightly doped ion implantation with thegate electrode 28 serving as a mask. - Further, in another embodiment of the invention, the
source electrode 21 anddrain electrode 22 can be formed by heavily doped ion implantation with thegate electrode 28 as mask. After performing the heavily doped ion implantation, thegate electrode 28 is etched to be reduced and the first semiconductor layer is subjected to a lightly doped ion implantation with the reducedgate electrode 28 serving as a mask. Thegate electrode 28 and thebottom electrode 29 are of the same material and formed by the same process. Suitable materials of thegate electrode 28 and thebottom electrode 29 can be Mo, W, Al, Ti, Cr, and combinations thereof. The gatedielectric layer 27 comprises a dielectric layer, with a material such as silicon oxide, with a thickness between 50 nm˜200 nm, for example 100 mn. - Next, referring to
FIG. 1 c, an interlayerdielectric layer 30 is blanketly formed on thesubstrate 10. The interlayerdielectric layer 30 can comprise a firstdielectric layer 31 and a seconddielectric layer 32, wherein the firstdielectric layer 31 can be silicon oxide or silicon nitride with a thickness between 50 nm to 300 nm, and the seconddielectric layer 32 can silicon oxide or silicon nitride with a thickness between 50 nm to 300 nm. - Next, referring to
FIG. 1 d, the interlayerdielectric layer 30 and the gatedielectric layer 27 are patterned to form afirst contact hole 41 and asecond contact hole 42 passing through the interlayerdielectric layer 30 and the gatedielectric layer 27 respectively exposing thesource electrode 21 and thedrain electrode 22, and athird contact hole 43 passing through thedielectric layer 30 exposing the surface of thebottom electrode 29. - Next, referring to
FIG. 1 e, a conductive layer (not shown) is formed on thesubstrate 10 and fills thefirst contact hole 41, thesecond contact hole 42, and thethird contact hole 43. Next, the conductive layer is patterned to form a source line (not shown), asource electrode plug 44 and adrain electrode plug 45, respectively, electrically connected to thesource electrode 21 anddrain electrode 22 via the first andsecond contact hole top electrode 46 is simultaneously formed and, electrically connects through thethird contact hole 43 to thebottom electrode 29 via theplug 47. Thebottom electrode 29 and thetop electrode 46 comprises a first capacitor electrode with a first electric potential. Thetop electrode 46 and thebottom electrode 29 can be the same or different material and comprises Mo (molybdenum), W (tungsten), Al (aluminum), Ti (titanium), Cr (chromium), alloy, or multi-layer structure thereof. - Next, referring to
FIG. 1 f, a capacitordielectric layer 50 and aplanarization layer 55 are formed on thesubstrate 10. The capacitordielectric layer 50 can be dielectric material, such as oxide-containing silicon, nitride-containing silicon, or multi-layer structure with a thickness between 50 nm to 200 nm, for example 100 nm. Theplanarization layer 55 can be organic material, such as polymer material, with a thickness of 2000 nm˜4000 nm and formed by spin-coating, printing or screen printing. - Next, referring to
FIG. 1 g, theplanarization layer 55 is patterned by a photo-mask to form afourth contact hole 61 over thedrain electrode plug 45 and afirst opening 62 over thetop electrode 46. It should be noted that the patternedplanarization layer 55 has different thicknesses. Theplanarization layer 55 over thedrain electrode plug 45 is completely removed to form acontact hole 61 exposing the capacitordielectric layer 50 over thedrain electrode plug 45. Theunpatterned planarization layer 55 has a first thickness t1. Theplanarization layer 55 on thetop electrode 46 is partially removed to remain aplanarization layer 56 with a second thickness t2. Herein, the first thickness t1 can be between 2000 nm˜4000 nm, and the second thickness t2 can be 200 nm˜500 nm. The photo-mask for forming thefourth contact hole 61 and thefirst opening 62 can be a halftone mask or Gray-tone mask. - Next, referring to
FIG. 1 h, the capacitordielectric layer 50 and theplanarization layer 55 are etched by anisotropic etching with the patternedplanarization layer 55 serving as a mask, forming afifth contact hole 71 passing through the capacitordielectric layer 50 and theplanarization layer 55 exposing thedrain electrode plug 45, and asecond opening 72 passing through theplanarization layer 55 exposing thesurface 73 of the capacitordielectric layer 50 formed on thetop electrode 46. Theplanarization layer 56 with the second thickness t2 can be removed during the anisotropic etching procedure, and theplanarization layer 55 with the first thickness can be etched so that theplanarization layer 55′ on the capacitordielectric layer 50 outside thefifth contact hole 71 and the second opening 72 remains. - Finally, referring to
FIG. 1 i, a transparent conductive layer is formed on the capacitordielectric layer 50 and filled into thefifth contact hole 71 and thesecond opening 72, serving aspixel electrode 80, thus fabrication of a semiconductor structure of a display device with high capacity storage is completed, requiring at least six photolithography steps according to the embodiment. Specifically, thepixel electrode 80 is electrically connected to thedrain electrode 22 via thedrain electrode plug 45. It should be noted that thepixel electrode 80 formed in thesecond opening 72 and the heavily dopedsecond semiconductor layer 25 comprises a second capacitor electrode with a second electrical potential. The transparent electrode can comprise ITO (indium tin oxide), IZO (indium zinc oxide), AZO (aluminum zinc oxide), ZnO (zinc oxide), GaN (gallium nitride), GaInN (gallium indium nitride), CdS (cadmium sulfide), ZnS (zinc sulfide), CdSe (cadmium selenide), or ZnSe (zinc selenide). - Still referring to
FIG. 1 i, the pixel capacitor of the invention can comprise: asecond semiconductor layer 25 formed on thesubstrate 10; a bottom dielectric layer (gate dielectric layer) 27 formed on thesecond semiconductor layer 27; abottom electrode 29 formed on thebottom dielectric layer 27; aninterlayer dielectric layer 30 formed on thebottom electrode 29; aplug 47 passing through thedielectric layer 30 and contact tobottom electrode 29; atop electrode 46 formed on thedielectric layer 30 and electrically connected to thebottom electrode 29 via theplug 47; thecapacitor dielectric layer 50 formed on thetop electrode 46; theplanarization layer 55 formed on thecapacitor dielectric layer 50 with asecond opening 72 exposing thecapacitor dielectric layer 50 directly over thetop electrode 46; and thetransparent electrode 80 formed on thecapacitor dielectric layer 50 over thetop electrode 46, wherein thetransparent electrode 80 electrically connects to thedrain electrode 22 and thesecond semiconductor layer 25 via thedrain electrode plug 45. - It should be noted that the pixel capacitor comprises a pixel electrode, thereby increasing the capacity storage without reducing the area of the display area (pixel electrode area). Further, the first capacitor electrode and the second capacitor electrode comprise two capacitors in different locations. Therefore, the capacity storage can be increased and the aperture rate of the pixel electrode can be kept. Moreover, a heavily doped semiconductor layer can be simultaneously formed to increase capacity storage of the capacitor when forming the source electrode and drain electrode by heavily doped ion implantation.
- According to another embodiment of the invention, referring to
FIG. 2 , the second semiconductor layer can also be anundoped semiconductor layer 33, and the thickness and material of thecapacitor dielectric layer 50 can be modified to increase capacity storage. Further, according to yet another embodiment of the invention, referring toFIG. 3 , the pixel capacitor can also only consist of thetop electrode 46 and thepixel electrode 80, and the thickness and material of thecapacitor dielectric layer 50 can be modified to increase capacity storage. - While the invention has been described by way of example and in terms of preferred embodiment, it is to be understood that the invention is not limited thereto. To the contrary, it is intended to cover various modifications and similar arrangements (as would be apparent to those skilled in the art). Therefore, the scope of the appended claims should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements.
Claims (31)
1. A method for fabricating a semiconductor structure of a display device, comprising:
providing a substrate with a thin film transistor region and a pixel capacitor region;
forming a first semiconductor layer on the thin film transistor region of the substrate;
forming a gate dielectric layer on the substrate;
forming a gate electrode on the gate dielectric layer within the thin film transistor region and a bottom electrode on the gate dielectric layer within the pixel capacitor region;
performing a heavily doped ion implantation on the first semiconductor layer to form a source electrode and a drain electrode, wherein the undoped first semiconductor layer defines as a channel region;
forming an interlayer dielectric layer on the substrate;
forming first and second contact holes respectively exposing the source electrode and the drain electrode and a third contact hole exposing the bottom electrode;
forming a source electrode plug and a drain electrode plug passing through the first and second contact holes to electrically contact to the source electrode and the drain electrode, respectively;
forming a top electrode electrically contacted to the bottom electrode via the third contact hole;
sequentially forming a capacitor dielectric layer and a planarization layer on the substrate;
patterning the capacitor dielectric layer and the planarization layer to form a fourth contact hole passing through the capacitor dielectric layer and the planarization layer exposing the drain electrode plug and an opening passing through the planarization layer exposing the capacitor dielectric layer directly over the top electrode; and
forming a pixel electrode filled in the fourth contact hole and the opening and electrically connected to t he drain electrode.
2. The method as claimed in claim 1 , wherein the top electrode and bottom electrode comprises a first capacitor electrode.
3. The method as claimed in claim 1 , wherein the steps for forming the first semiconductor layer on the thin film transistor region of the substrate further comprises:
simultaneously forming a second semiconductor layer on the pixel capacitor region of the substrate.
4. The method as claimed in claim 3 , wherein the second semiconductor layer and the pixel electrode comprises a second capacitor electrode.
5. The method as claimed in claim 3 . after forming a second semiconductor layer further comprising:
performing a heavily doped ion implantation on the second semiconductor layer.
6. The method as claimed in claim 3 , wherein the first semiconductor layer electrically connects to the second semiconductor layer.
7. The method as claimed in claim 3 , wherein the first and second semiconductor layers are of the same material and formed by the same process.
8. The method as claimed in claim 3 , wherein the first and second semiconductor layers are simultaneously subjected to heavily doped ion implantation.
9. The method as claimed in claim 1 , further comprising:
performing a lightly doped ion implantation on the first semiconductor layer to form a lightly doped region.
10. The method as claimed in claim 9 , wherein the first semiconductor layer is subjected to the heavily doped ion implantation and the lightly doped ion implantation with the gate electrode serving as a mask.
11. The method as claimed in claim 1 , wherein the fourth contact hole and the opening are formed simultaneously by one photolithography step.
12. The method as claimed in claim 1 , wherein the photolithography step for forming the fourth contact hole and the opening employs a halftone mask or Gray-tone mask.
13. The method as claimed in claim 1 , wherein the gate electrode and the bottom electrode are of the same material and formed by the same process.
14. The method as claimed in claim 1 , wherein the source electrode plug, drain electrode plug, and the top electrode are of the same material and formed by the same process.
15. A semiconductor structure of display device, comprising:
a substrate with a thin film transistor region and a pixel capacitor region;
a thin film transistor, a source electrode plug and a drain electrode plug formed on the thin film transistor region of the substrate, wherein the thin film transistor comprises a gate electrode, a source electrode, a drain electrode, a channel, and a gate dielectric layer, and the source electrode plug and the drain electrode plug electrically connected to the source electrode and the drain electrode, respectively;
a pixel capacitor is formed on the pixel capacitor region of the substrate, wherein the pixel capacitor comprises:
a bottom electrode formed on a bottom dielectric layer;
an interlayer dielectric layer formed on the substrate and the bottom electrode;
a top electrode formed on the interlayer dielectric layer, wherein the top electrode electrically connected to the bottom electrode;
a capacitor dielectric layer is formed on the substrate and the top electrode; and
a transparent electrode formed on the capacitor dielectric layer over the top electrode and electrically connected to the drain electrode plug.
16. The semiconductor structure of display device as claimed in claim 15 , further comprising a semiconductor layer on the substrate, directly under the bottom electrode.
17. The semiconductor structure of display device as claimed in claim 16 , wherein the semiconductor layer is electrically connected to the drain electrode.
18. The semiconductor structure of display device as claimed in claim 16 , wherein the semiconductor layer comprises a heavily doped semiconductor layer.
19. The semiconductor structure of display device as claimed in claim 15 , wherein the dielectric layer comprises oxide-containing silicon, nitride-containing silicon, and a combination thereof.
20. The semiconductor structure of display device as claimed in claim 15 , wherein the transparent electrode comprises ITO, IZO, AZO, ZnO, GaN, GaInN, CdS, ZnS, CdSe, or ZnSe.
21. The semiconductor structure of display device as claimed in claim 15 , wherein the top electrode and the bottom electrode comprises Mo, W, Al, Ti, Cr, and combinations thereof.
22. The semiconductor structure of display device as claimed in claim 15 , wherein the gate electrode and the bottom electrode are of the same material and formed by the same process.
23. The semiconductor structure of display device as claimed in claim 15 , wherein the source electrode plug, the drain electrode plug and the top electrode are of the same material and formed by the same process.
24. A pixel structure, comprising:
a semiconductor layer formed on a substrate;
a bottom dielectric layer formed on the semiconductor layer;
a bottom electrode formed on the bottom dielectric layer;
an interlayer dielectric layer formed on the bottom electrode;
a top electrode formed on the dielectric layer and electrically connected to the bottom electrode via a first plug, wherein the first plug passes through the interlayer dielectric layer;
a capacitor dielectric layer formed on the top electrode;
a planarization layer formed on the capacitor dielectric layer and an opening exposing the capacitor dielectric layer directly over the top electrode; and
a transparent electrode formed on the capacitor dielectric layer directly over the top electrode, wherein the transparent electrode electrically connects to the semiconductor layer via a second plug.
25. The pixel capacitor structure as claimed in claim 24 , wherein the semiconductor layer comprises a heavily doped semiconductor layer.
26. The pixel structure as claimed in claim 24 , wherein the dielectric layer comprises oxide-containing silicon, nitride-containing silicon, and a combination thereof.
27. The pixel structure as claimed in claim 24 , wherein the capacitor dielectric layer comprises oxide-containing silicon, nitride-containing silicon, and a combination thereof.
28. The pixel structure as claimed in claim 24 , wherein the transparent electrode comprises ITO, IZO, AZO, ZnO, GaN, GaInN, CdS, ZnS, CdSe, or ZnSe.
29. The pixel structure as claimed in claim 24 , wherein the top electrode and the bottom electrode comprises Mo, W, Al, Ti, Cr, and combinations thereof.
30. The pixel structure as claimed in claim 24 , wherein the bottom electrode and top electrode comprises a first capacitor electrode.
31. The pixel structure as claimed in claim 24 , wherein the semiconductor layer and the transparent electrode comprises a second capacitor electrode.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/815,513 US8202770B2 (en) | 2007-04-20 | 2010-06-15 | Semiconductor structure of a display device and method for fabricating the same |
US13/471,713 US8378404B2 (en) | 2007-04-20 | 2012-05-15 | Semiconductor structure of a display device and method for fabricating the same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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TW096114024A TWI337754B (en) | 2007-04-20 | 2007-04-20 | Semiconductor structure of display device and method for fabricating the same |
TW96114024 | 2007-04-20 |
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US12/815,513 Division US8202770B2 (en) | 2007-04-20 | 2010-06-15 | Semiconductor structure of a display device and method for fabricating the same |
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US20080258196A1 true US20080258196A1 (en) | 2008-10-23 |
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US12/815,513 Active 2028-03-23 US8202770B2 (en) | 2007-04-20 | 2010-06-15 | Semiconductor structure of a display device and method for fabricating the same |
US13/471,713 Active US8378404B2 (en) | 2007-04-20 | 2012-05-15 | Semiconductor structure of a display device and method for fabricating the same |
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US13/471,713 Active US8378404B2 (en) | 2007-04-20 | 2012-05-15 | Semiconductor structure of a display device and method for fabricating the same |
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Also Published As
Publication number | Publication date |
---|---|
US8202770B2 (en) | 2012-06-19 |
TWI337754B (en) | 2011-02-21 |
US20120223312A1 (en) | 2012-09-06 |
US20100244111A1 (en) | 2010-09-30 |
US8378404B2 (en) | 2013-02-19 |
TW200842930A (en) | 2008-11-01 |
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