WO2003054970A1 - Organischer feld-effekt-transistor mit verschobener schwellwertspannung und verwendung dazu - Google Patents
Organischer feld-effekt-transistor mit verschobener schwellwertspannung und verwendung dazu Download PDFInfo
- Publication number
- WO2003054970A1 WO2003054970A1 PCT/DE2002/004520 DE0204520W WO03054970A1 WO 2003054970 A1 WO2003054970 A1 WO 2003054970A1 DE 0204520 W DE0204520 W DE 0204520W WO 03054970 A1 WO03054970 A1 WO 03054970A1
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- WIPO (PCT)
- Prior art keywords
- ofet
- threshold voltage
- layer
- intermediate layer
- electronic
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K10/00—Organic devices specially adapted for rectifying, amplifying, oscillating or switching; Organic capacitors or resistors having a potential-jump barrier or a surface barrier
- H10K10/40—Organic transistors
- H10K10/46—Field-effect transistors, e.g. organic thin-film transistors [OTFT]
- H10K10/462—Insulated gate field-effect transistors [IGFETs]
- H10K10/464—Lateral top-gate IGFETs comprising only a single gate
Definitions
- the invention relates to an organic field-effect transistor with a shifted threshold voltage.
- a key parameter in organic field effect transistors is the location of the threshold voltage. This voltage indicates the gate voltage at which the current channel of the transistor is formed or becomes conductive. If this is close to 0V, two problems arise when building integrated circuits from these OFETs: two instead of just one voltage supply are required and about twice the number of transistors is required, since the output voltages of the logic elements have to be shifted before additional ones can be used Logic elements can be controlled. The consequences of these problems include a greatly increased power consumption, which is particularly the case with applications such as RF-ID tags (radio frequency
- the threshold voltage is close to 0V.
- the threshold voltage is even at positive voltages (CD.Sheraw, J.A.
- the object of the invention is therefore to provide a possibility for shifting the threshold voltage in OFETs, in particular in those whose threshold voltage is close to 0 V or in the positive range. It is also an object of the invention to disclose uses of OFETs with a shifted threshold voltage.
- the subject matter of the invention is an OFET comprising at least one substrate, structured source / drain electrodes, which are embedded in an organic semiconductor layer, adjoining them an insulator layer and a gate electrode, an intermediate layer being located between the semiconductor layer and the insulator layer there Space charge zone generated.
- a "space charge zone” is an area in which there are no free charge carriers.
- the intermediate layer creates a space charge zone that prevents the formation of a conductive current channel at low gate voltages.
- the normal generation of a current channel only takes place for larger gate voltages.
- This shifts the threshold voltage without having to accept the disadvantages such as reducing the ON / OFF ratio etc. or lower output currents.
- Whether the shift in the threshold voltage is 2V, 5V or more than 10V depends on the thickness and the donor concentration of the intermediate layer and can be adjusted as required by a suitable choice. This is an important advantage of the invention notification.
- Another advantage of the invention is that OFETs with this intermediate layer are significantly less sensitive to unintentional background doping of the semiconductor, since this is actively compensated for by the intermediate layer. This simplifies the manufacture of OFETs, since it is then possible, for example, to dispense with manufacture in the absence of oxygen.
- the intermediate layer is made of small, polarizable molecules with an internal dipole moment (e.g. di-sulfide dipole molecules) or of silanes, fullerenes or perylenes.
- an internal dipole moment e.g. di-sulfide dipole molecules
- silanes, fullerenes or perylenes e.g. silanes, fullerenes or perylenes.
- the intermediate layer is a few to a few tens of nanometers thick.
- the intermediate layer can either be applied to the semiconductor layer (in the case of top-gate OFETs) or to the insulator layer (in the case of bottom-gate OFETs).
- This application can be done by spin coating, pouring on, printing, steaming, immersing in a solution or by some other method of application.
- the invention can be applied to both p- and n-type OFETs.
- n-type OFETs are currently in the focus of interest, the following explanation is limited to p-type OFETs using figures which show exemplary embodiments of the invention.
- Figures la to lc show the prior art for comparison; Figures 2a to 2c show the same views in an embodiment of the invention.
- FIG. 1 a shows a cross section through a conventional OFET with a substrate 8 (for example a plastic film) structured source / drain electrodes 7, the organic semiconductor layer 6, the insulator layer 2 and the gate electrode 1.
- FIG. 1b shows the associated position of the LUMO or HOMO energies for the layer sequence gate electrode / insulator / semiconductor: LUMO- Energy 3 (corresponds to the energetic position of the conduction band), HOMO energy 5 (corresponds to the energetic position of the valence band) and Fermi level 4.
- An increase in the gate voltage by ⁇ Ui leads to an accumulation of the charge carriers at the interface between iso- lator and semiconductor (9 in Figure lc). This leads to an increase in the energy levels in the organic semiconductor layer 6 near the interface. The increase in the gate voltage thus leads directly to the formation of a current channel 9 in the OFET.
- FIG. 2a shows the structure of an OFET according to an embodiment of the invention.
- the space charge-generating layer 10 is located between the insulator layer 2 and the semiconducting layer 6.
- the main properties of this layer are a low work function, a Fermi level which is close to the LUMO 3 and a high number of donors. Because of these properties, the charge carriers of the adjacent semiconductor layer are bound to these donors. This creates a space charge zone. ie an area in which there are no free charge carriers.
- This space charge zone can be seen in FIG. 2b by the downward bent LUMO and HOMO levels 3 and 4 near the semiconductor / insulator interface. If the gate voltage is increased at this OFET, no current channel can be generated at low voltages, because all donors must first be filled with holes.
- the difference between the voltage ⁇ Ui (in FIG. 1c) and ⁇ U 2 (in FIG. 2c) corresponds to the shift in the threshold voltage.
- the content of the invention is the introduction of a very thin, non-conductive layer between the semiconducting material and the insulator in the OFET. The invention makes it possible for the first time to shift the threshold voltage of an OFET and at the same time to simplify the manufacture of the OFET, since it is possible to dispense with the exclusion of oxygen during manufacture.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/498,610 US7064345B2 (en) | 2001-12-11 | 2002-09-12 | Organic field effect transistor with off-set threshold voltage and the use thereof |
DE50214320T DE50214320D1 (de) | 2001-12-11 | 2002-12-09 | Organischer feld-effekt-transistor mit verschobener schwellwertspannung und verwendung dazu |
EP02805263A EP1454362B1 (de) | 2001-12-11 | 2002-12-09 | Organischer feld-effekt-transistor mit verschobener schwellwertspannung und verwendung dazu |
JP2003555592A JP2005513802A (ja) | 2001-12-11 | 2002-12-09 | オフセット閾値電圧を有する有機電界効果トランジスタおよびその使用 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10160732A DE10160732A1 (de) | 2001-12-11 | 2001-12-11 | Organischer Feld-Effekt-Transistor mit verschobener Schwellwertspannung und Verwendung dazu |
DE10160732.6 | 2001-12-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003054970A1 true WO2003054970A1 (de) | 2003-07-03 |
Family
ID=7708749
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2002/004520 WO2003054970A1 (de) | 2001-12-11 | 2002-12-09 | Organischer feld-effekt-transistor mit verschobener schwellwertspannung und verwendung dazu |
Country Status (5)
Country | Link |
---|---|
US (1) | US7064345B2 (de) |
EP (1) | EP1454362B1 (de) |
JP (1) | JP2005513802A (de) |
DE (2) | DE10160732A1 (de) |
WO (1) | WO2003054970A1 (de) |
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- 2002-12-09 WO PCT/DE2002/004520 patent/WO2003054970A1/de active Application Filing
- 2002-12-09 DE DE50214320T patent/DE50214320D1/de not_active Expired - Lifetime
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Cited By (5)
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JP2005175254A (ja) * | 2003-12-12 | 2005-06-30 | National Institute Of Advanced Industrial & Technology | ドーピング方法およびそれを用いた半導体素子 |
JP2006090983A (ja) * | 2004-09-27 | 2006-04-06 | Univ Of Tokyo | 面状素子モジュールおよびその製造方法並びに面状素子装置 |
JP2006147785A (ja) * | 2004-11-18 | 2006-06-08 | Matsushita Electric Ind Co Ltd | 電子デバイスおよびそれを用いた電子機器 |
JP2006196856A (ja) * | 2005-01-15 | 2006-07-27 | Samsung Sdi Co Ltd | 薄膜トランジスタ、その製造方法及びそれを備えた平板表示装置 |
US7671359B2 (en) | 2005-01-15 | 2010-03-02 | Samsung Mobile Display Co., Ltd. | Thin film transistor, a method for preparing the same and a flat panel display employing the same |
Also Published As
Publication number | Publication date |
---|---|
DE50214320D1 (de) | 2010-05-12 |
US7064345B2 (en) | 2006-06-20 |
US20050211972A1 (en) | 2005-09-29 |
EP1454362A1 (de) | 2004-09-08 |
JP2005513802A (ja) | 2005-05-12 |
EP1454362B1 (de) | 2010-03-31 |
DE10160732A1 (de) | 2003-06-26 |
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