Patent ID: 6627486
Filing Date: 2003-09-30
Classification: G02F,H01L

Abstract:
A method for manufacturing a semiconductor device comprising the steps of:providing at least one selected portion of a semiconductor film comprising amorphous silicon with a crystallization promoting material comprising a metal, said semiconductor film formed on an insulating surface; heating the semiconductor film provided with the crystallization promoting material at a temperature T0 so that crystallization of the semiconductor film proceeds from said selected portion to a region adjacent to said selected portion; patterning the crystallized semiconductor film into at least first and second semiconductor islands; and forming at least first and second thin film transistors using the first and second semiconductor islands as active layers of the first and second thin film transistors wherein said first and second thin film transistors constitute a differential circuit, wherein duration of the heating is 90% or more but less than 100% of duration to necessary for beginning to crystallize the semiconductor film at a temperature To under the condition that the crystallization promoting material is not used at all; and wherein the patterning of the crystallized semiconductor film is so performed that the first and second semiconductor islands are located at a same distance from the portion where the crystallization promoting material is provided.