Patent ID: 7791073
Filing Date: 2010-09-07
Classification: H01L

Abstract:
1. A single conductivity type MOS thin film multi-gate transistor comprising: a substrate; first and second gate electrodes separated from each other on a surface of said substrate; a gate insulating film on a surface of said substrate and surfaces of said first and second gate electrodes; a semiconductor layer formed on a surface of said gate insulating film; a source region and a drain region of a same conductivity type in a surface of said semiconductor layer at positions between which said first and second gate electrodes are interposed; an intermediate region in said semiconductor layer interposed between said first and second gate electrodes; and an intermediate electrode formed on a surface of said intermediate region, wherein said gate insulating film, said first gate electrode, said semiconductor layer, said source region and said intermediate region constitute a first transistor, said gate insulating film, said second gate electrode, said semiconductor layer, said drain region and said intermediate region constitute a second transistor, said second transistor has a threshold voltage lower than a threshold voltage of said first transistor, and said semiconductor layer forms a single conductivity type channel for both the first and the second transistors.