CN103236402B - 薄膜晶体管及其制作方法、阵列基板及显示装置 - Google Patents

薄膜晶体管及其制作方法、阵列基板及显示装置 Download PDF

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CN103236402B
CN103236402B CN201310153184.0A CN201310153184A CN103236402B CN 103236402 B CN103236402 B CN 103236402B CN 201310153184 A CN201310153184 A CN 201310153184A CN 103236402 B CN103236402 B CN 103236402B
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oxide semiconductor
semiconductor layer
film transistor
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CN103236402A (zh
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姜春生
方婧斐
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BOE Technology Group Co Ltd
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Abstract

本发明涉及显示技术领域,公开了一种薄膜晶体管制作方法,在基板上形成包括:栅极、栅绝缘层、氧化物半导体层、源漏极层的图形,在形成所述氧化物半导体层图形之后,在所述氧化物半导体层的表面形成金属氧化物的刻蚀阻挡层的图形。本发明的薄膜晶体管制作方法在氧化物半导体层上形成金属氧化物作为刻蚀阻挡层层,金属氧化物能够有效地阻挡外界水汽对氧化物薄膜晶体管的影响,而且在制作时也不会对氧化物半导体层产生损害,从而不会影响氧化物薄膜晶体管性能。

Description

薄膜晶体管及其制作方法、阵列基板及显示装置
技术领域
本发明涉及显示技术领域,特别涉及一种薄膜晶体管及其制作方法、阵列基板及显示装置。
背景技术
氧化物薄膜晶体管(ThinFilmTransistor,TFT)与非晶硅TFT均可作为驱动管用于有机发光二极管(OrganicLight-EmittingDiode,OLED)面板及高分子发光二极管(polymerlight-emittingdiode,PLED)面板等显示面板中。氧化物TFT与非晶硅TFT相比,其载流子浓度是非晶硅TFT的10倍。另外,氧化物TFT可通过磁控溅射(Sputter)的方法制备,因此采用氧化物TFT无需大幅改变现有的液晶面板生产线。同时,由于没有离子注入及激光晶化等工艺所需设备的限制,相对于多晶硅技术,氧化物TFT更有利于大面积的显示面板的生产。
现在国际上氧化物TFT的工艺如下(底栅工艺)形成图1的TFT结构。在玻璃基板110上沉积栅金属并刻蚀形成栅极120,沉积栅绝缘层130及氧化物半导体层140,氧化物半导体通常为铟镓锌氧化物(indiumgalliumzincoxide,IGZO)。利用湿刻对氧化物半导体层140进行刻蚀,随后沉积SiOx(硅的氧化物),形成刻蚀阻挡层(ESL)150并刻蚀,最后形成源极160和漏极170。
在现有的SiOx刻蚀阻挡层的制备过程中,反应气氛中的气体分子进入等离子体中,被分解为离子,同时这些带电离子具有非常高的能量,其在经过等离子体喷射至背板表面时会有轰击效应。这种现象会在作为基体的IGZO薄膜表面形成缺陷,在器件的使用过程中,导致TFT的半导体性能恶化。另外,SiOx作为的材料,不能很好地防止水汽向有缘层(氧化物半导体层)扩散(例如:将两块相同工艺,同为SiOx为刻蚀阻挡层材料的背板放入不同的湿度气氛中。经过一段时间后,两块显示面板的半导体特性将有很大的不同,在干燥气氛中的显示面板明显优于湿润气氛中的显示面板)。另外SiOx薄膜的制备一般为化学气相沉积(CVD),此设备是显示背板工业中的主要沉积设备,价格昂贵,占地面积大,而且耗能很大。
发明内容
(一)要解决的技术问题
本发明要解决的技术问题是:如何制作一种有效防水汽的刻蚀阻挡层,以保证影响TFT特性。
(二)技术方案
为解决上述技术问题,本发明提供了一种薄膜晶体管制作方法,在基板上形成包括:栅极、栅绝缘层、氧化物半导体层、源漏极层的图形,在形成所述氧化物半导体层图形之后,在所述氧化物半导体层的表面形成金属氧化物的刻蚀阻挡层的图形。
其中,在氧化物半导体层的表面形成金属氧化物的刻蚀阻挡层的图形的步骤具体包括:
在形成有所述氧化物半导体层的基板表面形成金属层;
通过构图工艺,形成金属氧化物的刻蚀阻挡层的图形。
其中,在形成有所述氧化物半导体层的基板表面形成金属层的步骤具体为:将所述含有金属离子的溶液注射到形成有所述氧化物半导体层的基板表面,并通过化学镀工艺在所述氧化物半导体层表面形成所述金属层。
其中,对所述金属层进行氧化处理形成金属氧化物的刻蚀阻挡层的图形;
所述氧化处理为对形成金属层的基板加热烘干,同时通入氧气。
其中,所述含有金属离子的溶液中包括:络合剂、稳定剂、表面活性剂、加速剂以及PH值调节剂中至少一种。
其中,所述金属氧化物为Al2O3
本发明还提供了一种薄膜晶体管,包括:形成在基板上的栅极、栅绝缘层、氧化物半导体层及源漏极层,还包括形成在氧化物半导体层的背离所述基板表面的由金属氧化物制成的刻蚀阻挡层。
其中,所述金属氧化物为Al2O3
本发明还提供了一种阵列基板,包括上述的薄膜晶体管。
本发明还提供了一种显示装置,包括上述的阵列基板。
(三)有益效果
本发明的薄膜晶体管制作方法在氧化物半导体层上形成金属氧化物作为刻蚀阻挡层,金属氧化物能够有效地阻挡外界水汽对氧化物薄膜晶体管的影响,而且在制作时也不会对氧化物半导体层产生损害,从而不会影响氧化物薄膜晶体管性能。
附图说明
图1是现有技术的一种薄膜晶体管结构示意图;
图2是本发明实施例的薄膜晶体管制作方法中在基板上形成栅极、栅绝缘层和氧化物半导体层的示意图;
图3是在图2的基础上形成含有铝离子的溶液示意图;
图4是在图3的基础上含铝离子的溶液形成铝薄膜的示意图;
图5是在图4的基础上铝薄膜氧化形成氧化铝的示意图;
图6是形成源漏电极后最终形成薄膜晶体管的结构示意图。
具体实施方式
下面结合附图和实施例,对本发明的具体实施方式作进一步详细描述。以下实施例用于说明本发明,但不用来限制本发明的范围。
本发明的薄膜晶体管制作方法中,在基板之上形成包括:栅极、栅绝缘层、氧化物半导体层、源漏极层的图形,在形成所述氧化物半导体层的图形之后,在其表面形成金属氧化物的刻蚀阻挡层的图形,即刻蚀阻挡层为金属氧化物材料制成。
本实施例中以底栅型TFT为例进行说明,制作方法具体包括如下步骤:
步骤一,如图2所示,在基板上210依次形成包括栅极220、栅绝缘层230及氧化物半导体层240的图形。其中形成过程可以是通过构图工艺(如:包括光刻胶涂敷、曝光、显影、刻蚀、光刻胶剥离等工艺)形成。氧化物半导体可以为IGZO。
步骤二,在氧化物半导体层上形成刻蚀阻挡层的图形,所述刻蚀阻挡层由金属氧化物制成。具体步骤如下:
首先在形成有所述氧化物半导体层的基板表面形成金属层;其次通过构图工艺,形成金属氧化物的刻蚀阻挡层的图形。
如图3和4所示,本实施例中,在形成有所述氧化物半导体层的基板表面形成金属层的步骤具体包括:在形成有所述氧化物半导体层的基板表面覆盖含有金属离子的溶液,并通过化学镀工艺在所述氧化物半导体层240表面形成金属层250'。
本实施例中,采用旋涂设备将所述含有金属离子的溶液注射到形成所述氧化物半导体层之后的基板表面。采用旋涂的方式相对于现有技术中化学气相沉积SiOx薄膜制作刻蚀阻挡层的方式成本低,旋涂设备占地面积小,方便实施,而且耗能较小。
如图5所示,本实施例中,通过构图工艺,形成金属氧化物的刻蚀阻挡层的图形具体为:对所述金属层250'进行氧化处理,以形成金属氧化物的刻蚀阻挡层250。
由于金属薄膜沉积后,金属薄膜表面有较多的旋涂液体,在氧化处理前还可以先对残留的溶液进行清洗,氧化处理可以采用对形成金属层250'的基板加热烘干,并同时通入足量氧气(使金属完全氧化)的方式进行。
所述含有金属离子的溶液中还可以包括:络合剂、稳定剂、表面活性剂、加速剂以及PH值调节剂中一种或两种或多种。
由于铝(Al)具有易被氧化的化学特性,因此本实施例中优选旋涂含有Al3+的化学溶液,可以是含有Al3+的盐溶液,如含Al3+的硫酸盐溶液,如图3所示,溶液中还包括
优选地,溶液中还包括:络合剂、稳定剂、表面活性剂、加速剂以及PH值调节剂。络合剂(可以为:乙二胺四乙酸或酒石酸)一方面可使铝离子的极化增大,使所得的镀层结晶细致光滑;另一方面可使旋涂的溶液稳定。稳定剂(可以为:Na2S)可以保证Al离子稳定。表面活性剂的作用是降低溶液的表面张力,使反应产生的氢气很容易从析出的铝层表面脱离而降低氢脆作用。氧化处理完成后最终形成Al2O3的刻蚀阻挡层250。
步骤三,形成源漏极层(源极260和漏极270)的图形,最终形成的氧化物TFT的结构示意图如图6所示。
本实施例中,金属氧化物的刻蚀阻挡层能够有效地阻挡外界水汽对氧化物TFT的影响,而且在制作过程中也不会对氧化物半导体层产生损害,从而不会影响氧化物TFT的性能。
本发明的薄膜晶体管制作方法不限于制作底栅型TFT,对于顶栅型TFT同样适用,不同的是各层在基板上形成的顺序不同,对于顶栅型TFT,在基板上依次形成遮光层、绝缘的隔离层、源漏极层,氧化物半导体层、刻蚀阻挡层、栅绝缘层及栅极。形成的刻蚀阻挡层的具体步骤和底栅型类似,此处不再赘述。
本发明中所提到的构图工艺是指将一整层薄膜或涂层通过一定的工艺过程,使该薄膜或涂层形成预定的图形形状的过程。
本发明还提供了一种薄膜晶体管,该薄膜晶体管可以按上述方法制作。该薄膜晶体管包括:形成在基板上的栅极、栅绝缘层、氧化物半导体层及源漏极层。为了更好地保护氧化物半导体层,使得TFT的性能在制作过程中不受影响,制成后不受外界水汽的影响,还包括形成在氧化物半导体层的背离所述基板表面的由金属氧化物制成的刻蚀阻挡层。
对于底栅型TFT,刻蚀阻挡层位于氧化物半导体层和源漏极层之间。对于顶栅型TFT,刻蚀阻挡层位于氧化物半导体层和栅绝缘层之间。
本发明还提供了一种阵列基板,包括栅线、数据线及栅线和数据线交叉形成的像素单元阵列,每个像素单元包括上述的薄膜晶体管。
本发明还提供了一种显示装置,上述的阵列基板,该显示装置可以为:液晶面板、电子纸、OLED面板、PLED面板、手机、平板电脑、电视机、显示器、笔记本电脑、数码相框、导航仪等任何具有显示功能的产品或部件。
以上实施方式仅用于说明本发明,而并非对本发明的限制,有关技术领域的普通技术人员,在不脱离本发明的精神和范围的情况下,还可以做出各种变化和变型,因此所有等同的技术方案也属于本发明的范畴,本发明的专利保护范围应由权利要求限定。

Claims (10)

1.一种薄膜晶体管制作方法,在基板上形成包括:栅极、栅绝缘层、氧化物半导体层、源漏极层的图形,其特征在于,在形成所述氧化物半导体层图形之后,在所述氧化物半导体层的表面形成金属氧化物的刻蚀阻挡层的图形;
所述刻蚀阻挡层覆盖沟道区和沟道区以外的区域。
2.如权利要求1所述的薄膜晶体管制作方法,其特征在于,在氧化物半导体层的表面形成金属氧化物的刻蚀阻挡层的图形的步骤具体包括:
在形成有所述氧化物半导体层的基板表面形成金属层;
通过构图工艺,形成金属氧化物的刻蚀阻挡层的图形。
3.如权利要求2所述的薄膜晶体管制作方法,其特征在于,在形成有所述氧化物半导体层的基板表面形成金属层的步骤具体为:将含有金属离子的溶液注射到形成有所述氧化物半导体层的基板表面,并通过化学镀工艺在所述氧化物半导体层表面形成所述金属层。
4.如权利要求3所述的薄膜晶体管制作方法,其特征在于,对所述金属层进行氧化处理形成金属氧化物的刻蚀阻挡层的图形;
所述氧化处理为对形成金属层的基板加热烘干,同时通入氧气。
5.如权利要求3所述的薄膜晶体管制作方法,其特征在于,所述含有金属离子的溶液中包括:络合剂、稳定剂、表面活性剂、加速剂以及PH值调节剂中至少一种。
6.如权利要求1~5中任一项所述的薄膜晶体管制作方法,其特征在于,所述金属氧化物为Al2O3
7.一种薄膜晶体管,包括:形成在基板上的栅极、栅绝缘层、氧化物半导体层及源漏极层,其特征在于,还包括形成在氧化物半导体层的背离所述基板表面的由金属氧化物制成的刻蚀阻挡层;
所述刻蚀阻挡层覆盖沟道区和沟道区以外的区域。
8.如权利要求7所述的薄膜晶体管,其特征在于,所述金属氧化物为Al2O3
9.一种阵列基板,其特征在于,包括如权利要求7或8所述的薄膜晶体管。
10.一种显示装置,其特征在于,包括如权利要求9所述的阵列基板。
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