Patent ID: 9059214
Filing Date: 2015-06-16
Classification: H01L

Abstract:
1. A method for manufacturing a thin film transistor (TFT) with a polysilicon active layer, comprising: depositing an amorphous silicon layer on a substrate, and patterning the amorphous silicon layer so as to form an active layer comprising a source region, a drain region and a channel region; depositing an inducing metal layer on the source region and the drain region; performing a first thermal treatment on the active layer provided with the inducing metal layer so that the source region and the drain region are crystallized under the effect of the inducing metal by metal inducing crystallization (MIC) and the channel region is crystallized by metal-induced lateral crystallization (MILC); doping the source region and the drain region with a first impurity for collecting the inducing metal, and doping the source region and the drain region with a second impurity according to the conductive type of the source region and the drain region; and performing a second thermal treatment on the doped active layer so that the first impurity absorbs the inducing metal remained in the channel region and the second impurity is activated by the second thermal treatment, wherein the inducing metal layer is deposited after the amorphous silicon layer is patterned.