Patent ID: 8377766
Filing Date: 2013-02-19
Classification: G03F,H01L

Abstract:
1. A method of making a source/drain electrode and a channel of a thin film transistor, comprising: providing a substrate and sequentially forming a semiconductor layer and a metal layer on the substrate; providing a photo-mask, wherein the photo-mask comprises: forming a photoresist layer on the metal layer and using the photo-mask to perform an exposure process on the photoresist layer, wherein the first opaque pattern and the second opaque pattern of the photo-mask correspond to a first region of the photoresist layer, the transparent single slit of the photo-mask corresponds to a second region of the photoresist layer, and the translucent pattern of the photo-mask corresponds to a third region of the photoresist layer; performing a development process on the photoresist layer to remove a portion of the photoresist layer to uncover the metal layer, wherein, after the development process, a thickness of the photoresist layer of the first region is thicker than a thickness of the photoresist layer of the second region and a thickness of the photoresist layer of the third region; removing the metal layer and the semiconductor layer uncovered by the photoresist layer; performing an ashing process on the photoresist layer to reduce the thickness of the photoresist layer of the first region and removing the photoresist layer of the second region and the photoresist layer of the third region to uncover the metal layer; removing the metal layer and a portion of the semiconductor layer uncovered by the photoresist layer to define a source electrode, a drain electrode, a channel and an extension portion; and removing the photoresist layer.