Patent ID: 6013544
Filing Date: 2000-01-11
Classification: H01L

Abstract:
A method for fabricating a semiconductor device including an active region obtained by utilizing a silicon semiconductor film having crystallinity, comprising the steps of:introducing a catalyst element for accelerating crystallization of a lower amorphous silicon semiconductor film into a predetermined region which is at least part of the lower amorphous silicon semiconductor film, then performing a first heat treatment so as to crystallize the lower amorphous silicon semiconductor film to form a lower crystalline silicon semiconductor film including a column-like crystal, subsequently forming an upper amorphous silicon semiconductor film on the lower crystalline silicon semiconductor film with no other film therebetween, and then performing a second heat treatment so as to crystallize the upper amorphous silicon semiconductor film to form an upper crystalline silicon semiconductor film,wherein a concentration of the catalyst element in the lower crystalline silicon semiconductor film is reduced by the second heat treatment so as to reform the lower crystalline silicon semiconductor film, the reformed lower crystalline silicon semiconductor film being used for forming the active region.