SEMICONDUCTOR DEVICE

摘要

PROBLEM TO BE SOLVED: To make structures of transistors arranged in various kinds of circuits proper depending on functions of the circuits to improve performance characteristics and reliability of a semiconductor device and achieve low power consumption, and reduces the number of processes to reduce manufacturing cost and improvement of yield.SOLUTION: In a semiconductor device, a transistor having an LDD region is formed. In order to form the LDD region a gate electrode having a tapered part is provided, an ionized N or P-type impurity element is accelerated by an electric field to pass the gate electrode and the gate insulation film to be added to a semiconductor layer.SELECTED DRAWING: Figure 3