CN1088001A - 具有光阻挡层的高效空间光调制器 - Google Patents

具有光阻挡层的高效空间光调制器 Download PDF

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CN1088001A
CN1088001A CN93109152A CN93109152A CN1088001A CN 1088001 A CN1088001 A CN 1088001A CN 93109152 A CN93109152 A CN 93109152A CN 93109152 A CN93109152 A CN 93109152A CN 1088001 A CN1088001 A CN 1088001A
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substrate
light
electrode
metal layer
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杰弗里B·桑普塞尔
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Texas Instruments Inc
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L27/00Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/14Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation
    • H01L27/144Devices controlled by radiation
    • H01L27/146Imager structures
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09FDISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/37Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being movable elements
    • G09F9/372Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being movable elements the positions of the elements being controlled by the application of an electric field
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/136Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362Active matrix addressed cells
    • G02F1/136277Active matrix addressed cells formed on a semiconductor substrate, e.g. of silicon
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00Details of semiconductor or other solid state devices
    • H01L23/552Protection against radiation, e.g. light or electromagnetic waves
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133509Filters, e.g. light shielding masks
    • G02F1/133512Light shielding layers, e.g. black matrix
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F2203/00Function characteristic
    • G02F2203/12Function characteristic spatial light modulator
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01LSEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/0001Technical content checked by a classifier
    • H01L2924/0002Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00

Abstract

一种具有接收光并具有挡住光(22)到达衬底的 金属层(24)的光有源区的半导体器件。该衬底包含 寻址电路(12)、(14)和(16),如果通过与光接触而形 成光生载流子,则这些电路能经受漏电流。一金属层 (24)被淀积作为器件的整体部分用于防止光到达衬 底。

Description

本发明涉及空间光调制器,尤其涉及半导体空间光调制器。
空间光调制器典型地由可个别寻址的线阵或面阵的单元组成。作为举例有:液晶显示单元、电-光调制器,磁-光调制器和数字式微镜(也称为可形变镜器件)。空间光调制器典型地有某种寻址电路、该电路允许每个单元被单独寻址。例如,液晶显示器,当它们处于透射状态时具有使晶体材料透射或阻碍透射的电极。这些电极也可有某种存贮结构与它们相联,使电极存贮确定每个单元状态的数据。
依赖其中设有它们寻址电路的半导体材料的空间光调制器存在着问题。这就是,必须使用直接照射这些单元的光源,入射到半导体如硅上的光产生载流子,这能导致寻址和存贮电路(如果使用的话)具有由这些光生载流子产生的漏电流。
通过将双层(double-level)金属寻址线应用于动态随机存取存贮器(DRAM)能减少光生载流子的产生。通常包含使用一层金属于水平互连和另一层金属用于垂直互连如数据线、地址线和电源供给的这一工艺过程一定会复盖着大部分的基片。遗憾的是,用于空间光调制器的光量能透过一复盖层,而引起漏电的光生载流子对半导体光调制器仍然是个问题。
这里揭示的本发明包含用于半导体空间光调制器的制造方法和结构,这种方法和结构显著地减少了半导体材料中产生的光生载流子。为与空间光调制器的结构相适配,一层光阻挡金属取一定图形。该层阻挡着入射到调制器上的照明的相当大的一部分,并防止光与半导体材料的接触。另外,它通过减少对针孔缺陷的敏感性使寻址电路各层之间的短路危害减至最小。
为了更完整理解本发明及其进一步的优点,现在结合附图进行如下详细描述。其中,
图1A-1B表示一空间光调制器的寻址电路的已有技术实施例和一光阻挡层的实施例;
图2表示制造具有光阻挡图的空间光调制器的方法流程图;
图3A-3F一层接一层地表示具有光阻挡层的空间光调制器阵列的顶视图。
先前,CMOS动态随机存取存贮器(DRAM)用双层(double    level)金属工艺来克服在半导体基片中光生载流子问题。通常,这种方式工作在光以低强度照射器件时的情况。对于需要空间光调制器利用中等强度至高强度光聚焦在它们上面的系统,在基片中仍然出现产生超量的光生载流子。
具有双层金属的寻址电路的一个例子示于图1A中。基片10上有一源极16、一漏极12和一栅极14。所示寻址电路用于数字式微镜,且由电极层18组成,该电极与基片10中的每个寻址晶体管的源极16相接触。光子20撞击电极层18并由金属将其挡住。光子22没有被电极层挡住并通过氧化层21与基片接触。光子22在基片中产生光生载流子且漏电流流出该晶体管,最终导致该电极失去它的寻址数据。
图1B表示应用本发明一实施例的数字式微镜器件。基片10有源极16、漏极12和栅极14。一个新的取一定图形的金属层或其它不透光的导电材料形成一阻挡层24。阻挡层24能由氧化层23支撑,它形成一定图形使寻址层与晶体管源极16相接触。电极层18现在位于阻挡层之上,在氧化层25上。当光子20撞到电极上,它仍被阻挡。另外,当光子22撞到器件上,它穿过电极层并撞到光阻挡层24上,也被阻挡。
这种阻挡特性也排除了大多数的针孔危害(pinhole    risk)。在图1B中,人们能看到:在器件的大部分表面上在氧化层25中存在着针孔缺陷,这会使电极层18与阻挡层24短路。穿过氧化层25的接触图型结构已将与这种缺陷关联的危害减至最小程度,层18的每个几何结构的大部分区域与位于其下的层24的那部分等电位。针孔危害被限制到一个小小的重叠区域,如27和29,只有在这些区域中,层18和24的重叠部分才处于不同电位。
图2详细描述了制造过程一实施例的流程图。准备好衬底,它是一种半导体,通常在步骤26将其制成薄片。在步骤28中形成最终激励镜元件的寻址电路。对于设计者而言,不管这些寻址电路是植入的晶体管还是做成的薄膜,它们通常包括在衬底上的电有源层内。作为这步骤的部分,该金属层,如果不是先前用于形成电有源区域的话,也淀积在基片上形成与该电有源区域的接触。步骤30用氧化物复盖寻址电路以允许淀积光阻挡层。
在步骤32中,淀积光阻挡层并形成一定的图形以避免与电有源区接触。当这种光阻挡层处于与镜元件和着陆电极不同电位时,不希望光阻挡层与这些区域接触。寻址电极希望处于变化的电位。最后,在步骤36中,开始标准的光调制器的制造过程。在数字式微镜情况下,这种制造过程的完成是淀积电极层和梁金属(beam    metal),用一厚层的光阻材料复盖它们形成一隔离层,再淀积柱和绞链层,镜金属,然后做成一定图形和蚀刻使镜元件通过最近由厚层占有的空间自由运动。
在图3中,一层接一层地显示了数字式微镜器件的顶视图。图3A表明器件的第一层,即基片区38,它大略对应于调制器制造其上的衬底面积。区域40表示给电极以信号使调制器元件作出响应的电有源区,例如图1A和1B中的漏极16。在图3B中,图3A的层用氧化物复盖,且使其成一定图形构成与图3A的电有源区的接触42。图3C表明光阻挡层44,它是图3B中构成接触上面的一层。长虚线将用来表示这一层,而图3A中的点线表示电有源区,实线表示接触。请注意,在复盖与电有源区的接触的金属片44和金属46的剩余部分之间存在间隙。这是因为对这些区域要求有不同的电压。内金属层将处于寻址电位,而外层处于被寻址元件的电位。
图3D显示了又一接触层。这些接触48接触图3C的内金属片44。另外,接触图3C的金属层46的接触50将维持调制器的有源区金属在地电位。这些接触50每一个连接到阵列中四个不同的镜子,这里仅显示了其中的一个,于是仅用短线表示。在图3E中,淀积调制器有源区。柱金属(post    metal)和着陆电极(landing    electrodes)52与图3D的接触50相接触,使它们接地,且寻址电极54与图3D的内接触48相接触。短虚线表明图3E中的电极层。
最后,在图3F中,整个寻址电路用图3A-3E一个挨一个叠放来表示。点线区40是图3A的植入物。由于那些接触位于基片上的相同格栅上,所以实线方块实际上代表两层接触,即图3B和图3D的层。最后柱上的图3D的接触50和形成寻址电极54的最后一层电极金属加在一起构成了元件的寻址电路。从这点开始该调制器的标准制造。如果调制器不是数字式微镜,当删除图3E和3F中的梁金属时,柱的接触将有更大的差别。
于是,虽然这里对具有光阻挡层的半导体光调制器的特定实施例作了详细描述,但这种具体描述不能看作对本发明的范围的限定,本发明将由如下权利要求书加以限定。

Claims (10)

1、一种半导体器件,它包含:
a,一衬底;
b,在所述基片中的电有源区;
c,基本上阻挡全部到达所述衬底的光第一金属层,它至少包含两个区域、一个区域至少与所述基片中的所述电有源区之一相接触,另一区域避开与所述电有源区相接触;和
d,形成着陆电极和寻址电极的第二金属层,其中所述寻址电极与接触所述电有源区的所述一个区域相连,而所述着陆电极与避开与所述电有源区的所述另一区域相连接。
2、如权利要求1或10所述器件,其特征在于,所述衬底是硅。
3、如权利要求1或10所述器件,其特征在于,所述电有源区域进一步包含晶体管的源极和漏极。
4、如权利要求9所述的器件,其特征在于,所述接收光的光有源区是数字式微镜器件的镜面部分。
5、一种制造半导体器件的方法,它包含:
a,准备一片衬底;
b,在所述基片上形成电有源区;
c,在所述电有源区上淀积一金属层,以使所述金属层具有:至少一个与所述电有源区接触的区域,和一个避开与所述电有源区接触的分开区域;
d,规定一构成着陆和地址电极的第二金属层,使得所述着陆电极避开与所述第一金属层的所述电有源区接触的所述区域相接触,且所述寻址电极与所述第一金属层的所述电有源区相接触的所述区域相接触;和
e,开发一光有源区以便所述区使所述第一和第二金属层,所述电有源区和所述衬底挡住撞击所述光有源区的光。
6、如权利要求5所述方法,其特征在于,所述形成步骤进一步包含在所述基片中形成晶体管。
7、如权利要求5所述方法,其特征在于,所述开发步骤进一步包含用光阻材料复盖所述第二金属层,淀积一附加金属层,使所述附加金属层成一定图表以形成铰链和柱,且除掉几乎所有的所述光阻材料。
8、如权利要求1所述半导体器件,其特征在于,所述第二金属层基本上挡住到达所述第一金属层的所述一区域和另一区域之间间隔的几乎全部的光。
9、如权利要求1或10所述半导体器件,其特征在于,它进一步包含在所述半导体器件的表面上的光有源区,所述光有源区接收来自一光源的光以便由所述光有源区使所述第二金属层,所述第一金属层,所述电有源区和所述衬底部分地蔽屏掉来自所述光源的光。
10、一种半导体器件,它包含:
a,一衬底;
b,在所述衬底中的电有源区;
c,阻挡光到达所述衬底的第一金属层;
d,形成着陆电极和寻址电极的第二金属层,所述第二金属层复盖了没有被所述第一金属层和所述第一金属层的重叠部分所复盖的几乎全部的区域,其中所述第一金属层和第二金属层一起挡住几乎所有的到达所述衬底的光。
CN93109152A 1992-08-11 1993-07-27 具有光阻挡层的高效空间光调制器 Expired - Fee Related CN1041019C (zh)

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US07/928,251 US5818095A (en) 1992-08-11 1992-08-11 High-yield spatial light modulator with light blocking layer
US928,251 1992-08-11

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CN1088001A true CN1088001A (zh) 1994-06-15
CN1041019C CN1041019C (zh) 1998-12-02

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US (2) US5818095A (zh)
EP (1) EP0582850B1 (zh)
JP (1) JPH06169102A (zh)
KR (1) KR100277451B1 (zh)
CN (1) CN1041019C (zh)
DE (1) DE69325213T2 (zh)
TW (1) TW288212B (zh)

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EP0582850B1 (en) 1999-06-09
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KR940006276A (ko) 1994-03-23
US5597736A (en) 1997-01-28
DE69325213T2 (de) 1999-11-25
EP0582850A1 (en) 1994-02-16
KR100277451B1 (ko) 2001-02-01
TW288212B (zh) 1996-10-11
US5818095A (en) 1998-10-06

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