Patent ID: 8008718
Filing Date: 2011-08-30
Classification: H01L

Abstract:
1. A semiconductor device comprising: a P-type thin film transistor having an LDD structure, an N-type thin film transistor having an off-set gate structure, and a substrate, the P-type thin film transistor including: a first semiconductor layer having a P-type low concentration impurity region; a first gate insulating film; and a first gate electrode on the substrate in this order, and further including: a first sidewall spacer formed on a side surface of the first gate electrode; and a P-type high concentration impurity layer having higher impurity concentration of a P-type impurity than that of the P-type low concentration impurity region; and the N-type thin film transistor including: a second semiconductor layer; a second gate insulating film; and a second gate electrode on the substrate in this order, and further including: a second sidewall spacer formed on a side surface of the second gate electrode; an N-type low concentration impurity layer; and an N-type high concentration impurity layer having higher impurity concentration of an N-type impurity than that of the N-type low concentration impurity layer; wherein the N-type low concentration impurity layer and the N-type high concentration impurity layer are stacked on the second semiconductor layer in a region other than a region below the second gate electrode and the second sidewall spacer, the P-type low concentration impurity region is formed in a region other than a region below the first gate electrode, the P-type high concentration impurity layer is formed on the P-type low concentration impurity region of the first semiconductor layer in a region other than a region below the first gate electrode and the first sidewall spacer, the P-type high concentration impurity layer contains the P-type impurity together with the N-type impurity contained in the N-type low concentration impurity layer and the N-type high concentration impurity layer, and a sum of a thickness of the N-type low concentration impurity layer and a thickness of the N-type high concentration impurity layer is substantially equal to a thickness of the P-type high concentration impurity layer.