CN105355588A - Tft阵列基板的制备方法、tft阵列基板及显示装置 - Google Patents

Tft阵列基板的制备方法、tft阵列基板及显示装置 Download PDF

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CN105355588A
CN105355588A CN201510638669.8A CN201510638669A CN105355588A CN 105355588 A CN105355588 A CN 105355588A CN 201510638669 A CN201510638669 A CN 201510638669A CN 105355588 A CN105355588 A CN 105355588A
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polysilicon layer
patterning
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source
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CN105355588B (zh
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肖军城
赵莽
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Wuhan China Star Optoelectronics Technology Co Ltd
TCL Huaxing Photoelectric Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
Wuhan China Star Optoelectronics Technology Co Ltd
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Priority to US14/890,698 priority patent/US9899528B2/en
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Abstract

本发明提供了一种TFT阵列基板的制备方法、TFT阵列基板及显示装置,该制备方法包括以下步骤:在衬底上形成栅极图案层;在栅极图案层上形成栅极绝缘层;在栅极绝缘层上形成图案化的多晶硅层,图案化的多晶硅层与栅极图案层连接;在图案化的多晶硅层的两侧分别形成源极重掺杂区和漏极重掺杂区,图案化的多晶硅层的中部区域为沟道区;在图案化的多晶硅层上形成隔离层;在隔离层上,采用一光罩通过光刻工艺以形成源、漏极图案层,源、漏极图案层与图案化的多晶硅层连接,光罩遮挡沟道区的一侧,采用同一光罩在未被遮挡的沟道区的另一侧形成轻掺杂区。本发明能够降低生产成本,且具有很强的设计灵活性。

Description

TFT阵列基板的制备方法、TFT阵列基板及显示装置
技术领域
本发明涉及液晶技术领域,特别是涉及一种TFT阵列基板的制备方法、TFT阵列基板及显示装置。
背景技术
随着低温多晶硅(LTPS)半导体薄膜晶体管(TFT)的发展,以及由于LTPS半导体本身超高载流子迁移率的特性,相应的面板周边集成电路也成为大家关注的焦点,并且很多人投入到SystemonPanel(SOP)的相关技术研究,并逐步成为现实。与此同时,由于LTPS半导体高迁移率的因素,其漏电特性相对于A-Si而言变得很差,漏电成为在LTPS设计中不可忽略的一部分。
如图1图2所示,图1是现有技术的TFT阵列基板的制备方法的流程示意图2是现有技术的TFT阵列基板的制备方法的工艺流程。现有技术中,具有底栅结构的LTPS-TFT的制备方法包括以下步骤:
S10,在衬底40上形成栅极图案层41。
S11,在栅极图案层41上形成栅极绝缘层42。
S12,在栅极绝缘层42上形成图案化的多晶硅层43,图案化的多晶硅层43与栅极图案层41连接。
S13,在图案化的多晶硅层43的两侧分别形成源极重掺杂区431和漏极重掺杂区432。
S14,采用一光罩在所述源极重掺杂区431内侧形成源极轻掺杂区434,在所述漏极重掺杂区432内侧形成漏极轻掺杂区433,源极轻掺杂区434和漏极轻掺杂区433之间为沟道区430。
S15,在所述图案化的多晶硅层43上形成隔离层44。
S16,在隔离层44上形成源、漏极图案层45,并将源、漏极图案层45连接到图案化的多晶硅层43上。
该制备方法中,在步骤S14形成轻掺杂区的时候,需要专门设计一光罩对需要形成轻掺杂区的区域之外的区域进行遮挡,而使得该方法的成本较高。
发明内容
本发明提供一种TFT阵列基板的制备方法、TFT阵列基板及显示装置,能够解决现有技术存在的需要专门设计一个光罩用于形成轻掺杂区导致制备成本高的问题。
为解决上述技术问题,本发明采用的一个技术方案是:提供一种TFT阵列基板的制备方法,该制备方法包括以下步骤:在衬底上形成栅极图案层;在所述栅极图案层上形成栅极绝缘层;在所述栅极绝缘层上形成图案化的多晶硅层,所述图案化的多晶硅层与所述栅极图案层连接;在所述图案化的多晶硅层的两侧分别形成源极重掺杂区和漏极重掺杂区,所述图案化的多晶硅层的中部区域为沟道区;在所述图案化的多晶硅层上形成隔离层;在所述隔离层上,采用一光罩通过光刻工艺形成源、漏极图案层,所述源、漏极图案层与所述图案化的多晶硅层连接,所述光罩遮挡所述沟道区的一侧,采用同一所述光罩在未被遮挡的所述沟道区的另一侧形成轻掺杂区。
其中,在所述隔离层上,采用一光罩通过光刻工艺以形成源、漏极图案层的步骤包括:在所述隔离层上淀积金属以形成金属层;在所述金属层上涂光刻胶;采用紫外光通过一光罩对所述光刻胶进行曝光;对所述光刻胶进行显影,以使所述光刻胶形成图案,所述光刻胶形成的图案遮挡了所述金属层的一部分,所述金属层的另一部分则显露出来;对显露出来的所述金属层的部位进行蚀刻,以形成所述源、漏极图案层;采用同一所述光罩对未被遮挡的所述沟道区的另一侧进行离子注入以形成所述轻掺杂区;剥离所述光刻胶。
其中,在所述栅极图案层上形成栅极绝缘层的步骤之后,还包括:在所述栅极绝缘层上形成栅极贯通孔,并在所述栅极贯通孔内填充导电材料;在所述栅极绝缘层上形成图案化的多晶硅层,所述图案化的多晶硅层与所述栅极图案层连接的步骤中,所述图案化的多晶硅层通过所述栅极贯通孔内的导电材料与所述栅极图案层进行连接。
其中,在所述图案化的多晶硅层上形成隔离层的步骤之后,还包括:在所述隔离层上、对应于所述源极重掺杂区的位置处形成源极贯通孔,在对应于所述漏极重掺杂区的位置处形成漏极贯通孔;在所述隔离层上淀积金属以形成金属层的步骤中,金属填充到所述源极贯通孔和所述漏极贯通孔而使所述源、漏极图案层与所述多晶硅层进行连接。
其中,在所述栅极绝缘层上形成图案化的多晶硅层的步骤包括:在所述栅极绝缘层上沉积非晶硅层;将所述非晶硅层转化为多晶硅层;将所述多晶硅层蚀刻为图案化的多晶硅层。
其中,将所述非晶硅层转化为多晶硅层的步骤中,采用准分子激光退火或者固相结晶的方法将所述非晶硅层转化为多晶硅层。
为解决上述技术问题,本发明采用的另一个技术方案是:提供一种TFT阵列基板,该阵列基板包括:衬底、栅极图案层、栅极绝缘层、图案化的多晶硅层、隔离层以及源、漏极图案层。其中,栅极图案层形成于衬底之;栅极绝缘层形成于所述栅极图案层之上;图案化的多晶硅层形成于所述栅极绝缘层之上,所述多晶硅层与所述栅极图案层连接,所述图案化的多晶硅层的两侧分别为源极重掺杂区和漏极重掺杂区,所述图案化的多晶硅层的中部区域为沟道区;隔离层形成于所述图案化的多晶硅层之上;源、漏极图案层形成于所述隔离层之上,所述源、漏极图案层与所述图案化的多晶硅层连接,所述源、漏极图案层的图案遮挡所述沟道区的一侧,未被所述源、漏极图案层遮挡的所述沟道区的另一侧为轻掺杂区。
其中,所述栅极绝缘层上设有栅极贯通孔,所述栅极贯通孔内填充有导电材料,图案化的多晶硅层通过所述栅极贯通孔内的导电材料与所述图案化的栅极图案层进行连接。
其中,所述隔离层上、对应于所述源极重掺杂区的位置处设有源极贯通孔,在对应于所述漏极重掺杂区的位置处设有漏极贯通孔,所述源、漏极图案层由金属形成,该金属填充所述源极贯通孔和所述漏极贯通孔而使所述源、漏极图案层与所述图案化的多晶硅层连接。
为解决上述技术问题,本发明采用的又一个技术方案是:提供一种显示装置,该显示装置包括上述TFT阵列基板。
本发明的有益效果是:区别于现有技术的情况,本发明的TFT阵列基板的制备方法在形成源、漏极图案层的时候采用的光罩的形状遮挡了沟道区的一侧的,使得在形成轻掺杂区的时候可以采用同一光罩在沟道区的另一侧形成,从而无需再设计一个用于形成轻掺杂区的光罩,节省了光罩的设计,从而节省了成本。此外,该制备方法具有很强的设计灵活性,可以通过光罩遮挡沟道区的面积大小来控制轻掺杂区的面积大小,从而能灵活控制轻掺杂区降低漏电流的效果。
附图说明
图1是现有技术的TFT阵列基板的制备方法的流程示意
图2是现有技术的TFT阵列基板的制备方法的工艺流程
图3是本发明TFT阵列基板的制备方法第一实施例的流程示意
图4是本发明TFT阵列基板的制备方法第一实施例的工艺流程
图5图3中步骤S102的流程示意
图6图3中步骤S105的流程示意
图7是本发明TFT阵列基板的制备方法第二实施例中的流程示意
图8是本发明一种TFT阵列基板实施例的截面的层状结构示意
图9是本发明一种显示装置实施例的结构示意
具体实施方式
下面结合附图和具体实施方式对本发明进行详细说明。
请参阅图3图4图3是本发明TFT阵列基板的制备方法第一实施例的流程示意图4是本发明TFT阵列基板的制备方法第一实施例的工艺流程
具体地,本发明TFT阵列基板的制备方法包括以下步骤:
S100,在衬底20上形成栅极图案层21。
举例而言,该栅极图案层21的形成如下:在衬底20上淀积金属以形成栅极金属层。栅极的金属通常为铝及铝合金,或者铝层、钨层、铬层叠加后形成的金属化合物导电层。然后在栅极金属层上涂光刻胶。再采用光罩对光刻胶进行光刻,以使光刻胶形成所需的图案,光刻胶形成的图案遮挡栅极金属层的一部分,未被遮挡的另一部分栅极金属层则显露出来。对显露出来的栅极金属层的部位进行蚀刻,以形成所需的栅极图案。最后,剥离光刻胶,从而形成栅极图案层21。
S101,在栅极图案层21上形成栅极绝缘层22。
步骤S101中,通过CVD或者PECVD技术形成栅极绝缘层22,栅极绝缘层22为一层结构,例如,SiO2层。当然,该栅极绝缘层22也可以是双层结构,例如,SiO2层和叠加的SiNx层。
S102,在栅极绝缘层22上形成图案化的多晶硅层23,图案化的多晶硅层23与栅极图案层22连接。
具体而言,如图5所示,图5图3中步骤S102的流程示意。图案化的多晶硅层23的形变包括以下步骤:
S1020,在栅极绝缘层22上沉积非晶硅层。
S1021,将非晶硅层转化为多晶硅层。
步骤S1021中,采用准分子激光退火或者固相结晶的方法将非晶硅层转化为多晶硅层。
S1022,将多晶硅层蚀刻为图案化的多晶硅层23。
步骤S1022具体包括以下步骤:
在多晶硅层上涂光刻胶26,再采用光罩对光刻胶26进行光刻,以使光刻胶26形成所需的图案,光刻胶26形成的图案遮挡了多晶硅层的一部分,未被遮挡的另一部分多晶硅层则显露出来。对显露出来的多晶硅层的部位进行蚀刻,以形成所需的多晶硅层的图案。最后,剥离光刻胶26。从而形成图案化多晶硅层23。
S103,在图案化的多晶硅层23的两侧分别形成源极重掺杂区231和漏极重掺杂区232,图案化的多晶硅层23的中部区域为沟道区230。
具体而言,步骤S103中,首先在图案化多晶硅层230上涂光刻胶,再通过曝光、显影等工艺将图案化的多晶硅层23的、需要形成源极重掺杂区231和漏极重掺杂区232的位置显露出来,然后通过离子注入法在该位置注入离子以形成源极重掺杂区231和漏极重掺杂区232。
S104,在图案化的多晶硅层23上形成隔离层24。
步骤S104中,隔离层24为通过CVD或者PECVD技术形成的SiO2层。该隔离层24覆盖在图案化的多晶硅层23之上,用于隔绝图案化的多晶硅层23和源、漏极图案层25。
S105,在隔离层24上,采用一光罩通过光刻工艺形成源、漏极图案层25,源、漏极图案层25与图案化的多晶硅层23连接,光罩遮挡沟道区230的一侧,采用同一光罩在未被遮挡的沟道区230的另一侧形成轻掺杂区233。
步骤S105中,源、漏极图案层25的具体形成过程请参阅图6,该过程包括以下步骤:
S1050,在隔离层24上淀积金属以形金属层。
步骤S1050是通过溅射工艺形成的,例如,溅射铝或铬等金属形成金属层。
S1051,在金属层上涂光刻胶。
本实施例中,步骤S1051采用的是旋转涂胶工艺。其中,光刻胶的厚度为
S1052,采用紫外光通过一光罩对光刻胶进行曝光。
本实施例中采用的是正性光刻胶,用紫外线通过该光罩照射光刻胶,其中,光罩遮挡了光刻胶的一部分,另一部分则显露出来,显露出来的部分光刻胶由于被紫外线照射而变软,被光罩遮挡住的光刻胶则不发生变化。
S1053,对光刻胶进行显影,以使光刻胶形成图案,光刻胶形成的图案遮挡了金属层的一部分,金属层的另一部分则显露出来。
步骤S1053中,采用显影液除去光刻胶的软化部分。
S1054,对显露出来的金属层的部位进行蚀刻,以形成源、漏极图案层25。
其中,蚀刻是为了去除不需要的金属以使金属层形成图案。蚀刻工艺包括湿刻和干刻,湿刻是用腐蚀液进行处理,以除去不需要的金属。干刻则是用减压下的气体放电,使之反应形成气态的处理。
S1055,采用同一光罩对未被遮挡的沟道区230的另一侧进行离子注入以形成轻掺杂区233。
轻掺杂漏区233(LightlyDopedDrain,LDD)结构,是为了减弱漏区电场、以改进热电子退化效应所采取的一种结构,即是在沟道中设置一个轻掺杂的漏区,让该轻掺杂的漏区也承受部分电压,这种结构可防止热电子退化效应。随着栅宽度的不断减小,栅结构下的沟道长度也不断减小,晶体管中沟道长度的减小增加了源漏间电荷击穿的可能性,并引起不希望的沟道电流。
步骤S1055中,继续使用步骤S1052中使用的光罩,保持其位置不动,该光罩遮挡了沟道的一侧,本实施例中,光罩遮挡的是沟道区230的靠近源极重掺杂区231的一侧,而沟道区230上、靠近漏极重掺杂区232的一侧则显露出来。通过离子注入使沟道区230上显露出来的一侧形成轻掺杂区233。由此本步骤采用的是步骤S1052的光罩,因而节省了该步骤的光罩的设计,降低了成本。
S1056,剥离光刻胶。
剥离光刻胶之后,源、漏极金属图案层25得以显露出来。其中,剥离工艺可以采用湿法剥离和干法剥离。湿法剥离是用剥离液除去形成图形时使用的光刻胶。干法剥离则是在减压条件下用氧气放电的方式使光刻胶氧化,形成气体状态而被除去,或者用臭氧和UV照射使光刻胶氧化形成挥发态气体而被除去。
本发明的方法制备的TFT为具有单边轻掺杂区233的TFT。当要求该轻掺杂区233达到跟双边轻掺杂区一样的降低漏电流的效果时,可以通过光罩的设计使光罩遮挡沟道区的较小的面积,从而获得较大的轻掺杂区233来实现,较大的轻掺杂区233可以达到双边轻掺杂区一样的降低漏电流的效果。
本实施例的TFT阵列基板上TFT的为N型TFT,图案化的多晶硅层23的源极重掺杂区231和漏极重掺杂区232掺杂了五价元素(如磷),沟道区230未掺杂杂质元素。磷元素取代晶格中硅原子的位置,就形成了N型半导体。在N型半导体中,自由电子为多子,空穴为少子,主要靠自由电子导电。自由电子主要由杂质原子提供,空穴由热激发形成。掺入的杂质越多,多子(自由电子)的浓度就越高,导电性能就越强。
值得一提的是,本发明的制备方法也适用于P型TFT,通常,P型TFT的源极重掺杂区和漏极重掺杂区掺杂的是三价元素(如硼),使之取代晶格中硅原子的位子,就形成P型半导体。在P型半导体中,空穴为多子,自由电子为少子,主要靠空穴导电。空穴主要由杂质原子提供,自由电子由热激发形成。掺入的杂质越多,多子(空穴)的浓度就越高,导电性能就越强。
区别于现有技术,本发明的TFT阵列基板的制备方法在形成源、漏极图案层的时候采用的光罩的形状遮挡了沟道区的一侧的,使得在形成轻掺杂区的时候可以采用同一光罩在沟道区的另一侧形成,从而无需再设计一个用于形成轻掺杂区的光罩,节省了光罩的设计,从而节省了成本。此外,该制备方法具有很强的设计灵活性,可以通过光罩遮挡沟道区的面积大小来控制轻掺杂区的面积大小,从而能灵活控制轻掺杂区降低漏电流的效果。
请参阅图7图7是本发明TFT阵列基板的制备方法第二实施例中的流程示意
本实施例的TFT的制备方法包括以下步骤:
S200,在衬底上形成栅极图案层。
S201,在栅极图案层上形成栅极绝缘层。
S202,在栅极绝缘层上形成栅极贯通孔,在栅极贯通孔内填充导电材料。
S203,在栅极绝缘层上形成图案化的多晶硅层,图案化的多晶硅层通过栅极贯通孔内的导电材料与栅极图案层进行连接。
S204,在图案化的多晶硅层的两侧分别形成源极重掺杂区和漏极重掺杂区,图案化的多晶硅层的中部区域为沟道区。
S205,在图案化的多晶硅层上形成隔离层。
S206,在隔离层上、对应于源极重掺杂区的位置处形成源极贯通孔,在对应于漏极重掺杂区的位置处形成漏极贯通孔。
S207,在隔离层上形成金属层,采用一光罩通过光刻工艺将该金属层形成源、漏极图案层,其中,该金属层填充到源极贯通孔和漏极贯通孔而使源、漏极图案层与图案化的多晶硅层连接。该光罩遮挡沟道区的一侧,采用同一光罩在未被遮挡的沟道区的另一侧形成轻掺杂区。
请参阅图8图8是本发明一种TFT阵列基板实施例的截面的层状结构示意
本发明提供了一种TFT阵列基板,该阵列基板包括衬底10、栅极图案层11、栅极绝缘层12、图案化的多晶硅层13、隔离层14以及源、漏极图案层15。
具体地,衬底10可以是玻璃基板,该玻璃基板材质均匀,具有高透明度和低反射率,并且有好的热稳定性,从而能在多次高温工艺之后保持性质稳定。由于TFT制造工艺中用到的化学药品很多,因而,该玻璃基板需具有很好的化学耐药性。该玻璃基板还需要具有足够的机械强度,还需要有很好的精密机械加工特性以及要有优良的电学绝缘特性。
栅极图案层11形成在衬底10上,栅极层图案层11通常是采用铝以及铝合金、或者铝层、钨层、铬层叠加后形成的金属化合物导电层,先形成栅极金属层,然后蚀刻成栅极图案层11。
栅极绝缘层12覆盖在栅极图案层11之上,栅极绝缘层12可以为一层,也可以是两层,第一层可以是SiO,SiN或AlO,厚度在175-300nm左右。本实施例的栅极绝缘层12包括一层SiO2层。
本实施例中,在栅极绝缘层12上设有栅极贯通孔(未示),栅极贯通孔内填充有导电材料。
图案化的多晶硅层13形成在栅极绝缘层12之上,图案化的多晶硅层13与栅极图案层11连接,具体地,该图案化的多晶硅层13通过栅极贯通孔内的导电材料与栅极图案层11连接。图案化的多晶硅层13的两侧分别为源极重掺杂区131和漏极重掺杂区132,图案化的多晶硅层13的中部区域为沟道区130。
隔离层14覆盖在图案化的多晶硅层13上,用于隔离图案化多晶硅层13和源、漏极图案层15。本实施例的隔离层14为SiO2层。
本实施例中,隔离层14上、对应于源极重掺杂区131的位置处设有源极贯通孔141,在对应于漏极重掺杂区132的位置处设有漏极贯通孔142。
源、漏极图案层15设在隔离层14之上,源、漏极图案层15与图案化的多晶硅层13连接。具体而言,源、漏极图案层15由金属形成,在形成源、漏极图案层15的时候,该金属填充源极贯通孔141和漏极贯通孔142而使源、漏极图案层15与图案化的多晶硅层13连接。源、漏极图案层15的图案遮挡沟道区130的一侧,未被源、漏极图案层15遮挡的沟道区130的另一侧为轻掺杂区133。
源、漏极图案层15采用铝合金,或者金属铝,或者金属铬制作而成,其中,源极与像素电极相接,漏极与数据信号线相接。
请参阅图9图9是本发明一种显示装置实施例的结构示意
本发明提供的显示装置包括外壳31和上述TFT阵列基板32。
本发明节省了形成轻掺杂区步骤中的光罩的设计,从而节省了成本,并且具有很强的设计灵活性,能灵活控制轻掺杂区降低漏电流。
以上仅为本发明的实施方式,并非因此限制本发明的专利范围,凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换,或直接或间接运用在其他相关的技术领域,均同理包括在本发明的专利保护范围内。

Claims (10)

1.一种TFT阵列基板的制备方法,其特征在于,包括以下步骤:
在衬底上形成栅极图案层;
在所述栅极图案层上形成栅极绝缘层;
在所述栅极绝缘层上形成图案化的多晶硅层,所述图案化的多晶硅层与所述栅极图案层连接;
在所述图案化的多晶硅层的两侧分别形成源极重掺杂区和漏极重掺杂区,所述图案化的多晶硅层的中部区域为沟道区;
在所述图案化的多晶硅层上形成隔离层;
在所述隔离层上,采用一光罩通过光刻工艺形成源、漏极图案层,所述源、漏极图案层与所述图案化的多晶硅层连接,所述光罩遮挡所述沟道区的一侧,采用同一所述光罩在未被遮挡的所述沟道区的另一侧形成轻掺杂区。
2.根据权利要求1所述的方法,其特征在于,在所述隔离层上,采用一光罩通过光刻工艺形成源、漏极图案层的步骤包括:
在所述隔离层上淀积金属以形成金属层;
在所述金属层上涂光刻胶;
采用紫外光通过一光罩对所述光刻胶进行曝光;
对所述光刻胶进行显影,以使所述光刻胶形成图案,所述光刻胶形成的图案遮挡了所述金属层的一部分,所述金属层的另一部分则显露出来;
对显露出来的所述金属层的部位进行蚀刻,以形成所述源、漏极图案层;
采用同一所述光罩对未被遮挡的所述沟道区的另一侧进行离子注入以形成所述轻掺杂区;
剥离所述光刻胶。
3.根据权利要求2所述的方法,其特征在于,在所述栅极图案层上形成栅极绝缘层的步骤之后,还包括:在所述栅极绝缘层上形成栅极贯通孔,并在所述栅极贯通孔内填充导电材料;
在所述栅极绝缘层上形成图案化的多晶硅层,所述图案化的多晶硅层与所述栅极图案层连接的步骤中,所述图案化的多晶硅层通过所述栅极贯通孔内的导电材料与所述栅极图案层进行连接。
4.根据权利要求3所述的方法,其特征在于,在所述图案化的多晶硅层上形成隔离层的步骤之后,还包括:在所述隔离层上、对应于所述源极重掺杂区的位置处形成源极贯通孔,在对应于所述漏极重掺杂区的位置处形成漏极贯通孔;
在所述隔离层上淀积金属以形成金属层的步骤中,金属填充到所述源极贯通孔和所述漏极贯通孔而使所述源、漏极图案层与所述多晶硅层进行连接。
5.根据权利要求4所述的方法,其特征在于,在所述栅极绝缘层上形成图案化的多晶硅层的步骤包括:
在所述栅极绝缘层上沉积非晶硅层;
将所述非晶硅层转化为多晶硅层;
将所述多晶硅层蚀刻为图案化的多晶硅层。
6.根据权利要求5所述的方法,其特征在于,将所述非晶硅层转化为多晶硅层的步骤中,采用准分子激光退火或者固相结晶的方法将所述非晶硅层转化为多晶硅层。
7.一种TFT阵列基板,其特征在于,包括:
衬底;
形成于衬底之上的栅极图案层;
形成于所述栅极图案层之上的栅极绝缘层;
形成于所述栅极绝缘层之上的图案化的多晶硅层,所述图案化的多晶硅层与所述栅极图案层连接,所述图案化的多晶硅层的两侧分别为源极重掺杂区和漏极重掺杂区,所述图案化的多晶硅层的中部区域为沟道区;
形成于所述图案化的多晶硅层之上的隔离层;
形成于所述隔离层之上的源、漏极图案层,所述源、漏极图案层与所述图案化的多晶硅层连接,所述源、漏极图案层的图案遮挡所述沟道区的一侧,未被所述源、漏极图案层遮挡的所述沟道区的另一侧为轻掺杂区。
8.根据权利要求7所述的TFT阵列基板,其特征在于,所述栅极绝缘层上设有栅极贯通孔,所述栅极贯通孔内填充有导电材料,图案化的多晶硅层通过所述栅极贯通孔内的导电材料与所述栅极图案层进行连接。
9.根据权利要求8所述的TFT阵列基板,其特征在于,所述隔离层上、对应于所述源极重掺杂区的位置处设有源极贯通孔,在对应于所述漏极重掺杂区的位置处设有漏极贯通孔,所述源、漏极图案层由金属形成,该金属填充所述源极贯通孔和所述漏极贯通孔而使所述源、漏极图案层与所述图案化的多晶硅层连接。
10.一种显示装置,其特征在于,包括权利要求7至9任一项所述的TFT阵列基板。
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