CN105047723B - 一种薄膜晶体管、其制作方法、阵列基板及显示装置 - Google Patents

一种薄膜晶体管、其制作方法、阵列基板及显示装置 Download PDF

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CN105047723B
CN105047723B CN201510601156.XA CN201510601156A CN105047723B CN 105047723 B CN105047723 B CN 105047723B CN 201510601156 A CN201510601156 A CN 201510601156A CN 105047723 B CN105047723 B CN 105047723B
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layer film
region
ohmic contact
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CN105047723A (zh
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熊胜楠
郑云友
李伟
张益存
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BOE Technology Group Co Ltd
Beijing BOE Display Technology Co Ltd
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Abstract

本发明公开了一种薄膜晶体管、其制作方法、阵列基板及显示装置,该方法包括:在衬底基板上依次形成栅极图形、栅极绝缘层薄膜、有源层薄膜、欧姆接触层薄膜、位于待形成的沟道区域内的第一刻蚀阻挡模块、源漏极金属层薄膜;利用第一刻蚀阻挡模块遮挡对应于待形成的沟道区域的有源层薄膜和欧姆接触层薄膜,通过湿法刻蚀形成包括源极和漏极的图形;通过干法刻蚀工艺形成包括欧姆接触层和有源层的图形。本发明在第一刻蚀阻挡模块可以保护对应于待形成的沟道区域的有源层薄膜的基础上,只通过湿法刻蚀工艺完成对源漏极金属层的刻蚀,刻蚀均匀,避免了干法刻蚀工艺对于源漏极金属层进行刻蚀时,刻蚀不均匀,设备损耗大,出现良率低的问题。

Description

一种薄膜晶体管、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,尤指一种薄膜晶体管、其制作方法、阵列基板及显示装置。
背景技术
通常,薄膜晶体管(Thin-film Transistor,TFT)在阵列基板中起到具有十分重要的作用。
目前,在薄膜晶体管的制作工艺中,具体包括:步骤一、如图1a所示,在衬底基板01上依次形成栅极02的图形、栅绝缘层薄膜03、有源层薄膜04、欧姆接触层薄膜05、源漏极金属层薄膜06以及光刻胶层薄膜07,对光刻胶层薄膜07进行曝光显影,得到光刻胶完全去除区域a、光刻胶部分保留区域b和光刻胶完全保留区域c,光刻胶完全去除区域a对应于除待形成有源层图形的区域之外的区域,光刻胶部分保留区域b对应于待形成的沟道区域,光刻胶完全保留区域c对应于待形成源极、漏极图形的区域,其中光刻胶部分保留区域的光刻胶可以避免对应于待形成的沟道区域的有源层薄膜04在下一步刻蚀工艺中受损;步骤二、如图1b所示,在湿刻设备中,通过湿法刻蚀工艺将光刻胶完全去除区域a的源漏极金属层薄膜06刻蚀掉,此时源漏极金属层薄膜06经过了一次湿法刻蚀,但并未形成源极、漏极的图形;步骤三、如图1c所示,在干刻设备中分别对光刻胶完全去除区域a的欧姆接触层薄膜05和有源层薄膜04进行干法刻蚀,对光刻胶部分保留区域b的光刻胶进行灰化,以及对光刻胶部分保留区域b的源漏极金属层薄膜06和欧姆接触层薄膜05进行干法刻蚀,得到有源层041、源极061、漏极062、欧姆接触层051等图形,此时源漏极金属层薄膜06又经过了一次干法刻蚀,才形成源极、漏极的图形;步骤四、如图1d所示,将剩余的光刻胶进行剥离。
在现有的TFT阵列基板制作工艺的上述步骤中,源漏极金属层薄膜经过了一次湿法刻蚀和一次干法刻蚀,其中在干法刻蚀工艺中对于与沟道区域对应的源漏极金属层进行刻蚀的时候有着各种弊端,例如干刻设备对金属层的刻蚀较困难,且刻蚀不均匀,设备损耗大,出现良率低的问题,难于适用于量产。
发明内容
有鉴于此,本发明实施例提供一种薄膜晶体管、其制作方法、阵列基板及显示装置,只通过利用湿法刻蚀对源漏极金属层进行刻蚀,刻蚀均匀,提高了产能。
因此,本发明实施例提供了一种薄膜晶体管的制作方法,包括:在衬底基板上依次形成栅极的图形、栅极绝缘层薄膜、有源层薄膜和欧姆接触层薄膜;
在所述欧姆接触层薄膜上位于待形成的沟道区域内形成第一刻蚀阻挡模块;
在形成所述第一刻蚀阻挡模块的衬底基板上形成源漏极金属层薄膜;
利用所述第一刻蚀阻挡模块遮挡对应于待形成的沟道区域的有源层薄膜和欧姆接触层薄膜,通过湿法刻蚀工艺在所述源漏极金属层薄膜形成包括源极和漏极的图形;
通过干法刻蚀工艺在所述欧姆接触层薄膜形成欧姆接触层的图形,以及在所述有源层薄膜形成有源层的图形。
在一种可能的实现方式中,在本发明实施例提供的上述薄膜晶体管的制作方法中,在所述欧姆接触层薄膜上位于待形成的沟道区域内形成第一刻蚀阻挡模块,具体包括:
在所述欧姆接触层薄膜上形成第一光刻胶层薄膜,对所述第一光刻胶层薄膜进行曝光显影,得到光刻胶完全保留区域和光刻胶完全去除区域;
所述光刻胶完全保留区域对应于待形成的沟道区域,所述光刻胶完全去除区域对应于除所述沟道区域以外的其他区域;
所述第一光刻胶层薄膜的光刻胶完全保留区域的光刻胶为第一刻蚀阻挡模块。
在一种可能的实现方式中,在本发明实施例提供的上述薄膜晶体管的制作方法中,利用所述第一刻蚀阻挡模块遮挡对应于待形成的沟道区域的有源层薄膜和欧姆接触层薄膜,通过湿法刻蚀工艺在所述源漏极金属层薄膜形成包括源极和漏极的图形,具体包括:
在所述源漏极金属层薄膜上对应待形成源极和漏极图形的区域形成第二刻蚀阻挡模块;
以所述第二刻蚀阻挡模块为掩膜,利用所述第一刻蚀阻挡模块遮挡对应于待形成的沟道区域的有源层薄膜和欧姆接触层薄膜,对所述源漏极金属层进行一次湿法刻蚀工艺,形成包括源极和漏极的图形。
在一种可能的实现方式中,在本发明实施例提供的上述薄膜晶体管的制作方法中,在所述源漏极金属层薄膜上对应待形成源极和漏极图形的区域形成第二刻蚀阻挡模块,具体包括:
在所述源漏极金属层薄膜上形成第二光刻胶层薄膜,对所述第二光刻胶层薄膜进行曝光显影,得到光刻胶完全保留区域和光刻胶完全去除区域;
所述光刻胶完全保留区域对应于待形成源极和漏极图形的区域,所述光刻胶完全去除区域对应于除待形成源极和漏极图形的区域以外的其他区域;
所述第二光刻胶层薄膜的光刻胶完全保留区域的光刻胶为第二刻蚀阻挡模块。
在一种可能的实现方式中,在本发明实施例提供的上述薄膜晶体管的制作方法中,通过干法刻蚀工艺在所述欧姆接触层薄膜形成欧姆接触层的图形,以及在所述有源层薄膜形成有源层的图形,具体包括:
以所述第一刻蚀阻挡模块和第二刻蚀阻挡模块为掩膜,通过一次干法刻蚀工艺刻蚀掉除对应于待形成沟道区域、源极和漏极图形的区域以外的欧姆接触层薄膜;
去除掉所述第一刻蚀阻挡模块;
以所述第二刻蚀阻挡模块为掩膜,通过一次干法刻蚀工艺刻蚀掉对应于待形成沟道区域的欧姆接触层薄膜,以及刻蚀掉除对应于待形成沟道区域、源极和漏极图形的区域以外的有源层薄膜,在所述欧姆接触层薄膜形成欧姆接触层的图形,以及在所述有源层薄膜形成有源层的图形。
在一种可能的实现方式中,在本发明实施例提供的上述薄膜晶体管的制作方法中,去除掉第一刻蚀阻挡模块,具体包括:
对所述第一刻蚀阻挡模块进行灰化处理。
在一种可能的实现方式中,在本发明实施例提供的上述薄膜晶体管的制作方法中,在所述欧姆接触层薄膜形成欧姆接触层的图形,以及在所述有源层薄膜形成有源层的图形之后,还包括:
对所述第二刻蚀阻挡模块进行剥离。
本发明实施例还提供了一种薄膜晶体管,所述薄膜晶体管使用本发明实施例提供的上述制作方法制作。
本发明实施例还提供了一种阵列基板,包括本发明实施例提供的上述薄膜晶体管。
本发明实施例还提供了一种显示装置,包括本发明实施例提供的上述阵列基板。
本发明实施例的有益效果包括:
本发明实施例提供的一种薄膜晶体管、其制作方法、阵列基板及显示装置,该方法包括:首先在衬底基板上依次形成栅极的图形、栅极绝缘层薄膜、有源层薄膜和欧姆接触层薄膜;然后在欧姆接触层薄膜上位于待形成的沟道区域内形成第一刻蚀阻挡模块;之后在形成第一刻蚀阻挡模块的衬底基板上形成源漏极金属层薄膜;再利用第一刻蚀阻挡模块遮挡对应于待形成的沟道区域的有源层薄膜和欧姆接触层薄膜,通过湿法刻蚀工艺在源漏极金属层薄膜形成包括源极和漏极的图形;最后通过干法刻蚀工艺在欧姆接触层薄膜形成欧姆接触层的图形,以及在有源层薄膜形成有源层的图形。本发明实施例提供的制作方法中,在第一刻蚀阻挡模块可以保护对应于待形成的沟道区域的有源层薄膜的基础上,只通过湿法刻蚀工艺完成对源漏极金属层的刻蚀,刻蚀均匀,避免了干法刻蚀工艺对于源漏极金属层进行刻蚀时,刻蚀不均匀,设备损耗大,出现良率低的问题。
附图说明
图1a至图1d分别为现有技术中薄膜晶体管的制作方法在各步骤执行后的结构示意图;
图2为本发明实施例提供的薄膜晶体管的制作方法流程图之一;
图3为本发明实施例提供的薄膜晶体管的制作方法流程图之二;
图4a至图4i分别为本发明实施例提供的薄膜晶体管的制作方法在各步骤执行后的结构示意图。
具体实施方式
下面结合附图,对本发明实施例提供的薄膜晶体管、其制作方法、阵列基板及显示装置的具体实施方式进行详细地说明。
其中,附图中各膜层的厚度和形状不反映薄膜晶体管的真实比例,目的只是示意说明本发明内容。
本发明实施例提供了一种薄膜晶体管的制作方法,如图2所示,包括:
S201、在衬底基板上依次形成栅极的图形、栅极绝缘层薄膜、有源层薄膜和欧姆接触层薄膜;
S202、在欧姆接触层薄膜上位于待形成的沟道区域内形成第一刻蚀阻挡模块;
S203、在形成第一刻蚀阻挡模块的衬底基板上形成源漏极金属层薄膜;
S204、利用第一刻蚀阻挡模块遮挡对应于待形成的沟道区域的有源层薄膜和欧姆接触层薄膜,通过湿法刻蚀工艺在源漏极金属层薄膜形成包括源极和漏极的图形;
S205、通过干法刻蚀工艺在欧姆接触层薄膜形成欧姆接触层的图形,以及在有源层薄膜形成有源层的图形。
在本发明实施例提供的上述薄膜晶体管的制作方法中,该方法包括:首先在衬底基板上依次形成栅极的图形、栅极绝缘层薄膜、有源层薄膜和欧姆接触层薄膜;然后在欧姆接触层薄膜上位于待形成的沟道区域内形成第一刻蚀阻挡模块;之后在形成第一刻蚀阻挡模块的衬底基板上形成源漏极金属层薄膜;再利用第一刻蚀阻挡模块遮挡对应于待形成的沟道区域的有源层薄膜和欧姆接触层薄膜,通过湿法刻蚀工艺在源漏极金属层薄膜形成包括源极和漏极的图形;最后通过干法刻蚀工艺在欧姆接触层薄膜形成欧姆接触层的图形,以及在有源层薄膜形成有源层的图形。本发明实施例提供的制作方法中,在第一刻蚀阻挡模块可以保护对应于待形成的沟道区域的有源层薄膜的基础上,只通过湿法刻蚀工艺完成对源漏极金属层的刻蚀,形成包括源极和漏极的图形,刻蚀均匀,避免了干法刻蚀工艺对于源漏极金属层进行刻蚀时,刻蚀不均匀,设备损耗大,出现良率低的问题。
在具体实施时,在本发明实施例提供的上述薄膜晶体管的制作方法中,为了简化工艺,步骤S202在欧姆接触层薄膜上位于待形成的沟道区域内形成第一刻蚀阻挡模块,具体可以采用如下方式实现:
在欧姆接触层薄膜上形成第一光刻胶层薄膜,对第一光刻胶层薄膜进行曝光显影,得到光刻胶完全保留区域和光刻胶完全去除区域;光刻胶完全保留区域对应于沟道区域,光刻胶完全去除区域对应于除沟道区域以外的其他区域;此时,第一光刻胶层薄膜的光刻胶完全保留区域的光刻胶可以作为第一刻蚀阻挡模块。
具体地,第一刻蚀阻挡模块的材料为光刻胶,则形成第一刻蚀阻挡模块的图形只需进行曝光显影工序即可,无需刻蚀工艺,可以简化工艺,节省成本,减少资源浪费。
在具体实施时,在本发明实施例提供的上述薄膜晶体管的制作方法中,为了确保能够实现通过湿法刻蚀工艺形成包括源极和漏极的图形,如图3所示,步骤S204利用所述第一刻蚀阻挡模块遮挡对应于待形成的沟道区域的有源层薄膜和欧姆接触层薄膜,通过湿法刻蚀工艺在源漏极金属层薄膜形成包括源极和漏极的图形,具体可以采用如下方式实现:
S301、在源漏极金属层薄膜上对应待形成源极和漏极图形的区域形成第二刻蚀阻挡模块;
S302、以第二刻蚀阻挡模块为掩膜,利用第一刻蚀阻挡模块遮挡对应于待形成的沟道区域的有源层薄膜和欧姆接触层薄膜,对源漏极金属层进行一次湿法刻蚀工艺,形成包括源极和漏极的图形。
具体地,设置的第一阻挡模块和第二阻挡模块可以有效阻挡刻蚀过程中对膜层的损坏,且第一阻挡模块可以保护对应于待形成的沟道区域的有源层薄膜和欧姆接触层薄膜(不需要刻蚀的部分),第二阻挡模块可以使待形成的沟道区域的源漏极金属层(需要刻蚀的部分)充分裸露,便于进行步骤S302中的湿法刻蚀工艺,利于形成源极和漏极的图形,不会出现刻蚀不均匀,设备损耗大的问题。
在具体实施时,在本发明实施例提供的上述薄膜晶体管的制作方法中,为了简化工艺,步骤S301在源漏极金属层薄膜上对应待形成源极和漏极图形的区域形成第二刻蚀阻挡模块,具体可以采用如下方式实现:
在源漏极金属层薄膜上形成第二光刻胶层薄膜,对第二光刻胶层薄膜进行曝光显影,得到光刻胶完全保留区域和光刻胶完全去除区域;光刻胶完全保留区域对应于待形成源极和漏极图形的区域,光刻胶完全去除区域对应于除待形成源极和漏极图形的区域以外的其他区域;此时第二光刻胶层薄膜的光刻胶完全保留区域的光刻胶可以作为第二刻蚀阻挡模块。
具体地,第二刻蚀阻挡模块的材料为光刻胶,则形成第二刻蚀阻挡模块的图形只需进行曝光显影工序即可,无需刻蚀工艺,可以简化工艺,节省成本,减少资源浪费。
在具体实施时,在本发明实施例提供的上述薄膜晶体管的制作方法中,为了简化工艺,步骤S205工艺在欧姆接触层薄膜形成欧姆接触层的图形,以及在有源层薄膜形成有源层的图形,具体可以采用如下方式实现:
S303、以第一刻蚀阻挡模块和第二刻蚀阻挡模块为掩膜,通过一次干法刻蚀工艺刻蚀掉除对应于待形成沟道区域、源极和漏极图形的区域以外的欧姆接触层薄膜;
S304、去除掉第一刻蚀阻挡模块;
S305、以第二刻蚀阻挡模块为掩膜,通过一次干法刻蚀工艺刻蚀掉对应于待形成沟道区域的欧姆接触层薄膜,以及刻蚀掉除对应于待形成沟道区域、源极和漏极图形的区域以外的有源层薄膜,在欧姆接触层薄膜形成欧姆接触层的图形,以及在有源层薄膜形成有源层的图形。
具体地,首先通过一次干法刻蚀工艺对除对应于待形成沟道区域、源极和漏极图形的区域以外的欧姆接触层薄膜进行刻蚀,然后去除掉第一刻蚀阻挡模块,最后通过一次干法刻蚀工艺对对应于待形成沟道区域的欧姆接触层薄膜和除对应于待形成沟道区域、源极和漏极图形的区域以外的有源层薄膜进行刻蚀,同时形成包括有源层和欧姆接触层的图形。上述步骤中主要优点在于缩短了整体时间、节约了原料,较之传统工艺减少了工艺间隔时间,提高了良率。
在具体实施时,在本发明实施例提供的上述薄膜晶体管的制作方法中,步骤S304去除掉第一刻蚀阻挡模块,具体可以采用如下方式实现:
对第一刻蚀阻挡模块进行灰化处理;此时,针对第一刻蚀阻挡模块的材料为光刻胶时,进行灰化处理。
在具体实施时,在本发明实施例提供的上述薄膜晶体管的制作方法中,执行步骤S305在欧姆接触层薄膜形成欧姆接触层的图形,以及在有源层薄膜形成有源层的图形之后,还可以包括:
S306、对第二刻蚀阻挡模块进行剥离。此时,针对第二刻蚀阻挡模块的材料为光刻胶时,进行剥离。将第二刻蚀阻挡模块进行剥离后,可以得到完整的无残留的源极和漏极的图形。
下面以一个具体的实例详细的说明本发明实施例提供的薄膜晶体管的制作方法,制作薄膜晶体管的具体步骤如下:
步骤一、在衬底基板上依次形成栅极的图形、栅极绝缘层薄膜、有源层薄膜、以及欧姆接触层薄膜;
在具体实施时,如图4a所示,首先在衬底基板1上采用溅射或热蒸发的方法沉积一层栅金属膜,栅金属膜可以选用Cr、Cu、Ti、Ta、Mo等金属或合金,由多层金属组成的栅金属层也能满足需要,通过一次光刻工艺后,形成栅极2的图形;然后通过等离子体增强化学气相沉积法(PECVD)方法连续沉积一定厚度的栅绝缘层薄膜3,栅绝缘层薄膜3可以选用氧化物、氮化物或者氧氮化合物;接着在栅绝缘层薄膜3上通过溅射或热蒸发的方法沉积一定厚度的有源层薄膜4,该有源层薄膜4可以为金属氧化物半导体层,金属氧化物半导体层可以采用非晶硅、多晶硅、微晶硅或其他氧化物半导体层材料;之后在有源层薄膜4上通过溅射或热蒸发的方法沉积一定厚度的欧姆接触层薄膜5,该欧姆接触层薄膜5可以为n+型a-Si:H薄膜;
步骤二、在欧姆接触层薄膜上位于待形成的沟道区域内形成第一刻蚀阻挡模块;
在具体实施时,如图4b所示,在完成步骤一的衬底基板1上通过PECVD方法沉积一定厚度的第一光刻胶层薄膜(PR),经过一次曝光显影后,得到光刻胶完全保留区域和光刻胶完全去除区域;光刻胶完全保留区域对应于沟道区域,光刻胶完全去除区域对应于除沟道区域以外的其他区域;此时,第一光刻胶层薄膜的光刻胶完全保留区域的光刻胶可以作为第一刻蚀阻挡模块61;
步骤三、在形成第一刻蚀阻挡模块的衬底基板上形成源漏极金属层薄膜;
在具体实施时,如图4c所示,在完成步骤二的衬底基板1上采用溅射或热蒸发的方法,镀上一定厚度的金属膜层为源漏极金属层薄膜7;
步骤四、在源漏极金属层薄膜上对应待形成源极和漏极图形的区域形成第二刻蚀阻挡模块;
在具体实施时,如图4d所示,在完成步骤三的衬底基板1上通过PECVD方法沉积一定厚度的第二光刻胶层薄膜(PR),经过一次曝光显影后,得到光刻胶完全保留区域和光刻胶完全去除区域;光刻胶完全保留区域对应于待形成源极和漏极图形的区域,光刻胶完全去除区域对应于除待形成源极和漏极图形的区域以外的其他区域;此时第二光刻胶层薄膜的光刻胶完全保留区域的光刻胶可以作为第二刻蚀阻挡模块62;
步骤五、以第二刻蚀阻挡模块为掩膜,利用第一刻蚀阻挡模块遮挡对应于待形成的沟道区域的有源层薄膜和欧姆接触层薄膜,对源漏极金属层进行一次湿法刻蚀工艺,形成包括源极和漏极的图形;
在具体实施时,如图4e所示,在湿刻设备中,以第二刻蚀阻挡模块62为掩膜,利用第一刻蚀阻挡模块61遮挡对应于待形成的沟道区域的有源层薄膜和欧姆接触层薄膜,对源漏极金属层薄膜7通过一次湿法刻蚀工艺去除源漏极金属层薄膜7的与沟道区域对应的部分,以及除与待形成有源层的区域以外对应的部分,形成源极71和漏极72的图形;
步骤六、以第一刻蚀阻挡模块和第二刻蚀阻挡模块为掩膜,通过一次干法刻蚀工艺刻蚀掉除对应于待形成沟道区域、源极和漏极图形的区域以外的欧姆接触层薄膜;
在具体实施时,如图4f所示,在干刻设备中,通过一次干法刻蚀工艺对除对应于待形成沟道区域、源极和漏极图形的区域以外的欧姆接触层薄膜5进行刻蚀(此刻蚀工艺后,有源层薄膜4有残留);
步骤七、去除掉第一刻蚀阻挡模块;
在具体实施时,如图4g所示,在干刻设备中,对第一刻蚀阻挡模块61进行灰化处理,去除掉第一刻蚀阻挡模块61;
步骤八、以第二刻蚀阻挡模块为掩膜,通过一次干法刻蚀工艺刻蚀掉对应于待形成沟道区域的欧姆接触层薄膜,以及刻蚀掉除对应于待形成沟道区域、源极和漏极图形的区域以外的有源层薄膜,在欧姆接触层薄膜形成欧姆接触层的图形,以及在有源层薄膜形成有源层的图形;
在具体实施时,如图4h所示,在干刻设备中,通过一次干法刻蚀工艺对对应于待形成沟道区域的欧姆接触层薄膜5和除对应于待形成沟道区域、源极和漏极图形的区域以外的有源层薄膜4进行刻蚀,同时形成包括有源层41和欧姆接触层51的图形;通过刻蚀条件及时间可以在对对应于待形成沟道区域的欧姆接触层薄膜刻蚀结束时,使除对应于待形成沟道区域、源极和漏极图形的区域以外的有源层薄膜刚好完全被刻蚀掉;上述步骤中主要优点在于缩短了整体时间、节约了原料,较之传统工艺减少工艺间隔时间提高良率;
步骤九、对第二刻蚀阻挡模块进行剥离;
在具体实施时,如图4i所示,在湿刻设备中,对源极71和漏极72上方的第二刻蚀阻挡模块62进行剥离。
至此,经过具体实例提供的上述步骤一至步骤九制作出了本发明实施例提供的上述薄膜晶体管。
基于同一发明构思,本发明实施例还提供了一种薄膜晶体管,由于该结构解决问题的原理与前述一种薄膜晶体管的制作方法相似,因此该结构的实施可以参见薄膜晶体管的制作方法的实施,重复之处不再赘述。
基于同一发明构思,本发明实施例还提供了一种阵列基板,包括本发明实施例提供的上述薄膜晶体管。在具体实施时,本发明实施例提供的阵列基板中一般还会具有诸如钝化层、平坦层、像素电极等其他膜层结构,以及在衬底基板上还一般形成有栅线、数据线、公共电极线等结构,这些具体结构可以有多种实现方式,在此不做限定。
基于同一发明构思,本发明实施例还提供了一种显示装置,包括本发明实施例提供的上述阵列基板,该显示装置可以为: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。对于该显示装置的其它必不可少的组成部分均为本领域的普通技术人员应该理解具有的,在此不做赘述,也不应作为对本发明的限制。该显示装置的实施可以参见上述阵列基板、薄膜晶体管的实施例,重复之处不再赘述。
本发明实施例提供的一种薄膜晶体管、其制作方法、阵列基板及显示装置,该方法包括:首先在衬底基板上依次形成栅极的图形、栅极绝缘层薄膜、有源层薄膜和欧姆接触层薄膜;然后在欧姆接触层薄膜上位于待形成的沟道区域内形成第一刻蚀阻挡模块;之后在形成第一刻蚀阻挡模块的衬底基板上形成源漏极金属层薄膜;再利用第一刻蚀阻挡模块遮挡对应于待形成的沟道区域的有源层薄膜和欧姆接触层薄膜,通过湿法刻蚀工艺在源漏极金属层薄膜形成包括源极和漏极的图形;最后通过干法刻蚀工艺在欧姆接触层薄膜形成欧姆接触层的图形,以及在有源层薄膜形成有源层的图形。本发明实施例提供的制作方法中,在第一刻蚀阻挡模块可以保护对应于待形成的沟道区域的有源层薄膜的基础上,只通过湿法刻蚀工艺完成对源漏极金属层的刻蚀,刻蚀均匀,避免了干法刻蚀工艺对于源漏极金属层进行刻蚀时,刻蚀不均匀,设备损耗大,出现良率低的问题。
显然,本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精神和范围。这样,倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的范围之内,则本发明也意图包含这些改动和变型在内。

Claims (7)

1.一种薄膜晶体管的制作方法,其特征在于,包括:
在衬底基板上依次形成栅极的图形、栅极绝缘层薄膜、有源层薄膜和欧姆接触层薄膜;
在所述欧姆接触层薄膜上位于待形成的沟道区域内形成第一刻蚀阻挡模块;
在形成所述第一刻蚀阻挡模块的衬底基板上形成源漏极金属层薄膜;
利用所述第一刻蚀阻挡模块遮挡对应于待形成的沟道区域的有源层薄膜和欧姆接触层薄膜,通过湿法刻蚀工艺在所述源漏极金属层薄膜形成包括源极和漏极的图形;
通过干法刻蚀工艺在所述欧姆接触层薄膜形成欧姆接触层的图形,以及在所述有源层薄膜形成有源层的图形。
2.如权利要求1所述的制作方法,其特征在于,在所述欧姆接触层薄膜上位于待形成的沟道区域内形成第一刻蚀阻挡模块,具体包括:
在所述欧姆接触层薄膜上形成第一光刻胶层薄膜,对所述第一光刻胶层薄膜进行曝光显影,得到光刻胶完全保留区域和光刻胶完全去除区域;
所述光刻胶完全保留区域对应于待形成的沟道区域,所述光刻胶完全去除区域对应于除所述沟道区域以外的其他区域;
所述第一光刻胶层薄膜的光刻胶完全保留区域的光刻胶为第一刻蚀阻挡模块。
3.如权利要求1所述的制作方法,其特征在于,利用所述第一刻蚀阻挡模块遮挡对应于待形成的沟道区域的有源层薄膜和欧姆接触层薄膜,通过湿法刻蚀工艺在所述源漏极金属层薄膜形成包括源极和漏极的图形,具体包括:
在所述源漏极金属层薄膜上对应待形成源极和漏极图形的区域形成第二刻蚀阻挡模块;
以所述第二刻蚀阻挡模块为掩膜,利用所述第一刻蚀阻挡模块遮挡对应于待形成的沟道区域的有源层薄膜和欧姆接触层薄膜,对所述源漏极金属层进行一次湿法刻蚀工艺,形成包括源极和漏极的图形。
4.如权利要求3所述的制作方法,其特征在于,在所述源漏极金属层薄膜上对应待形成源极和漏极图形的区域形成第二刻蚀阻挡模块,具体包括:
在所述源漏极金属层薄膜上形成第二光刻胶层薄膜,对所述第二光刻胶层薄膜进行曝光显影,得到光刻胶完全保留区域和光刻胶完全去除区域;
所述光刻胶完全保留区域对应于待形成源极和漏极图形的区域,所述光刻胶完全去除区域对应于除待形成源极和漏极图形的区域以外的其他区域;
所述第二光刻胶层薄膜的光刻胶完全保留区域的光刻胶为第二刻蚀阻挡模块。
5.如权利要求3所述的制作方法,其特征在于,通过干法刻蚀工艺在所述欧姆接触层薄膜形成欧姆接触层的图形,以及在所述有源层薄膜形成有源层的图形,具体包括:
以所述第一刻蚀阻挡模块和第二刻蚀阻挡模块为掩膜,通过一次干法刻蚀工艺刻蚀掉除对应于待形成沟道区域、源极和漏极图形的区域以外的欧姆接触层薄膜;
去除掉所述第一刻蚀阻挡模块;
以所述第二刻蚀阻挡模块为掩膜,通过一次干法刻蚀工艺刻蚀掉对应于待形成沟道区域的欧姆接触层薄膜,以及刻蚀掉除对应于待形成沟道区域、源极和漏极图形的区域以外的有源层薄膜,在所述欧姆接触层薄膜形成欧姆接触层的图形,以及在所述有源层薄膜形成有源层的图形。
6.如权利要求5所述的制作方法,其特征在于,去除掉第一刻蚀阻挡模块,具体包括:
对所述第一刻蚀阻挡模块进行灰化处理。
7.如权利要求5所述的制作方法,其特征在于,在所述欧姆接触层薄膜形成欧姆接触层的图形,以及在所述有源层薄膜形成有源层的图形之后,还包括:
对所述第二刻蚀阻挡模块进行剥离。
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