WO2020088368A1 - 薄膜晶体管及其制作方法、阵列基板、显示装置 - Google Patents
薄膜晶体管及其制作方法、阵列基板、显示装置 Download PDFInfo
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Abstract
Description
Claims (19)
- 一种薄膜晶体管,包括:设置于基板上的有源层以及与所述有源层电接触的源极和漏极;其中,所述源极和所述漏极均包括层叠设置的第一子电极和第二子电极,且所述第一子电极相对于所述第二子电极靠近所述有源层;所述源极和所述漏极中的至少一者的第二子电极与所述有源层在所述基板上的正投影的交叠区域的面积,小于其第一子电极与所述有源层在所述基板上的正投影的交叠区域的面积。
- 根据权利要求1所述的薄膜晶体管,其中,所述有源层包括:与所述源极的第一子电极电接触的第一接触部分,与所述漏极的第一子电极电接触的第二接触部分,及位于所述第一接触部分和所述第二接触部分之间的非接触部分;沿第一方向,所述源极的第二子电极靠近所述非接触部分的边缘,与所述漏极的第二子电极靠近所述非接触部分的边缘之间的距离,至少在部分区域大于所述非接触部分在所述第一方向上的长度;其中,所述第一方向为平行于所述基板且由所述第一接触部分指向所述第二接触部分的方向。
- 根据权利要求2所述的薄膜晶体管,其中,所述源极和所述漏极中至少一者的第二子电极靠近所述非接触部分的边缘在任意位置处,到所述非接触部分的距离均大于零。
- 根据权利要求3所述的薄膜晶体管,其中,所述源极和所述漏极中至少一者的第二子电极靠近所述非接触部分的边缘在任意位置处,到所述非接触部分的距离相等。
- 根据权利要求4所述的薄膜晶体管,其中,在所述源极的第二子电极靠近所述非接触部分的边缘在任意位置处,到所述非接触部分的距离相等,且所述漏极的第二子电极靠近所述非接触部分的边缘在任意位置处,到所述非接触部分的距离相等的情况下,所述源极的第二子电极靠近所述非接触部分的边缘到所述非接触部分的距离,与所述漏极的第二子电极靠近所述非接触部分的边缘到所述非接触部分的距离相等。
- 根据权利要求2~5中任一项所述的薄膜晶体管,其中,所述源极和所述漏极中的至少一者的第二子电极靠近所述非接触部分的边缘在任意位 置处,到所述非接触部分的距离为2μm~7μm。
- 根据权利要求2~5中任一项所述的薄膜晶体管,其中,所述源极和所述漏极中的至少一者的第二子电极靠近所述非接触部分的边缘,到所述非接触部分的距离,大于或等于相应的接触部分在所述第一方向上的长度;其中,所述相应的接触部分为与该第二子电极距离最近的接触部分。
- 根据权利要求1所述的薄膜晶体管,其中,所述源极和所述漏极中至少一者的第二子电极具有至少一个镂空部,所述至少一个镂空部在所述基板上的正投影位于所述有源层在所述基板上的正投影范围之内。
- 根据权利要求1~8中任一项所述的薄膜晶体管,其中,所述薄膜晶体管包括依次设置于所述基板上的栅极、栅极绝缘层、所述有源层、源漏图案层;所述源漏图案层包括所述源极和所述漏极。
- 根据权利要求1所述的薄膜晶体管,其中,所述第二子电极的材质包括铜、铝和银中的至少一种。
- 一种阵列基板,包括权利要求1~10任一项所述的薄膜晶体管。
- 一种显示装置,包括权利要求11所述的阵列基板。
- 一种薄膜晶体管的制作方法,包括:在基板上形成有源层;在形成有所述有源层的基板上形成源极和漏极;其中,所述源极和所述漏极分别与所述有源层电接触;所述源极和所述漏极均包括层叠设置的第一子电极和第二子电极,且所述第一子电极相对于所述第二子电极靠近所述有源层;所述源极和所述漏极中的至少一者的第二子电极与所述有源层在所述基板上的正投影的交叠区域的面积,小于其第一子电极与所述有源层在所述基板上的正投影的交叠区域的面积。
- 根据权利要求13所述的薄膜晶体管的制作方法,其中,所述在基板上形成有源层之前,还包括:在基板上依次形成栅极和栅极绝缘层。
- 根据权利要求14所述的薄膜晶体管的制作方法,其中,所述在基板上依次形成栅极、栅极绝缘层包括:在形成有所述有源层的基板上依次形成第一导电层和第二导电层,并通过构图工艺对所述第一导电层和所述第二导电层进行构图,形成初始源极和初始漏极;其中,所述初始源极和所述初始漏极均包括由所述第一导 电层形成第一子电极和由所述第二导电层形成的初始第二子电极;在形成有所述初始源极和所述初始漏极的基板上形成阻蚀层,通过研磨工艺对所述阻蚀层进行研磨,或者通过构图工艺对所述阻蚀层进行构图,暴露出所述初始源极和所述初始漏极的初始第二子电极与所述有源层交叠的部分的表面;采用刻蚀工艺,从暴露出的表面,对所述初始源极和所述初始漏极的初始第二子电极进行刻蚀,形成所述源极和所述漏极;其中,所述源极和所述漏极均包括所述第一子电极和由所述初始第二子电极形成的第二子电极。
- 根据权利要求15所述的薄膜晶体管的制作方法,其中,在通过研磨工艺对所述阻蚀层进行研磨的情况下,所述研磨工艺包括化学研磨工艺和机械研磨工艺中的至少一种。
- 根据权利要求15所述的薄膜晶体管的制作方法,其中,在对所述初始源极和所述初始漏极的初始第二子电极进行刻蚀的过程中,所使用的刻蚀液能够与所述初始第二子电极发生反应,不与所述第一子电极发生反应。
- 根据权利要求15所述的薄膜晶体管的制作方法,其中,在对所述初始源极和所述初始漏极的初始第二子电极进行刻蚀的过程中,通过控制刻蚀参数,使得所形成的源极和漏极的第二子电极在靠近所述有源层的非接触部分的边缘,到所述非接触部分的距离为2μm~7μm;其中所述刻蚀参数包括刻蚀速率和刻蚀时间中的至少一者。
- 根据权利要求13或14所述的薄膜晶体管的制作方法,其中,所述在形成有所述有源层的基板上形成源极和漏极,包括:在形成有所述有源层的基板上形成第一导电层,并通过构图工艺对所述第一导电层进行构图,形成所述源极和所述漏极的第一子电极;在形成有所述源极和所述漏极的第一子电极的基板上形成第二导电层,并通过构图工艺对所述第二导电层进行构图,形成所述源极和所述漏极中的第二子电极。
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