Patent ID: 6407431
Filing Date: 2002-06-18
Classification: G02F,H01L

Abstract:
A semiconductor device comprising:at least a gate wiring; at least a source wiring; at least a bottom gate type thin film transistor arranged to a pixel; at least a storage capacitor connected to a pixel electrode; and a first crystalline semiconductor film of the thin film transistor, said first crystalline semiconductor film including a source region, a drain region and at least one channel forming region therein, wherein each of the source region and the drain region in the first crystalline semiconductor film includes toward a gate insulating film, at least a first conductive layer, at least a second conductive layer having a higher resistance than the first conductive layer, and at least a first semiconductor layer having a same conductive type as the channel forming region, wherein a concentration profile of an impurity to give a conductivity to the first and the second conductive layers is varied continuously from the first conductive layer to the second conductive layer, and wherein the storage capacitor comprises, a first electrode comprising a same conductive film as the gate wiring, a dielectric body in contact with the first electrode, and a second electrode comprising a second semiconductor layer being in contact with the dielectric body and having a same conductive type as the channel forming region.