Patent ID: 8368142
Filing Date: 2013-02-05
Classification: H01L

Abstract:
1. A semiconductor device comprising: a substrate; and a thin film transistor over the substrate, wherein the thin film transistor comprises: wherein the semiconductor layer comprises needle-shaped or column-shaped crystals which are substantially aligned in a direction parallel to a length direction of the channel formation region, wherein the channel formation region comprises a substantially intrinsic region and an impurity region, wherein the substantially intrinsic region extends continuously from the source region to the drain region, wherein the impurity region extends continuously from the source region to the drain region, wherein the substantially intrinsic region is in contact with the source region and the drain region, wherein the impurity region is in contact with the source region and the drain region, and wherein a standard deviation of S-value of the thin film transistor is within 10 mV/dec for an N-channel type and 15 mV/dec for a P-channel type.