Patent ID: 7195960
Filing Date: 2007-03-27
Classification: G02F,H01L

Abstract:
1. A method of manufacturing a transistor, comprising: forming a semiconductor film on a substrate; forming an intrinsic portion and a first impurity portion in the semiconductor film by applying a first impurity atom to the semiconductor film, the intrinsic portion not including the first impurity atom, the first impurity portion including the first impurity atom; forming an insulator film over the semiconductor film; forming a gate electrode over the insulator film to define the first impurity portion as three portions, a first portion of the first impurity portion overlapping with the gate electrode, and a second portion of the first impurity portion and a third portion of the first impurity portion not overlapping with the gate electrode, the first portion of the first impurity portion being positioned between the second portion of the first impurity portion and the third portion of the first impurity portion, and to define the intrinsic portion as three portions, a first portion of the intrinsic portion overlapping with the gate electrode, and a second portion of the intrinsic portion and a third portion of the intrinsic portion not overlapping with the gate electrode, the first portion of the intrinsic portion being positioned between the second portion of the intrinsic portion and the third portion of the intrinsic portion; and forming a second impurity portion in the semiconductor film by applying a second impurity atom to the semiconductor film using the gate electrode as a mask, the second portion of the intrinsic portion being turned into a first portion of the second impurity portion by the applying the second impurity atom, the third portion of the intrinsic portion being turned into a second portion of the second impurity portion by the applying the second impurity atom, the second portion of the first impurity portion protruding into the first portion of the second impurity portion, and the third portion of the first impurity portion protruding into the second portion of the second impurity portion.