Patent ID: 6465045
Filing Date: 2002-10-15
Classification: C23C,H01L,Y10T

Abstract:
A method of forming a multi-layer thin film assembly comprising a plurality of polysilicon thin films, said multi-layer assembly having a selectively determinable overall stress characteristic, said method comprising:forming a first polysilicon thin film having a thickness and either (i) a devitrified microstructure and an internal tensile stress or (ii) a predominantly columnar microstructure and an internal compressive stress; and forming a second polysilicon thin film immediately adjacent to said first polysilicon thin film, said second polysilicon thin film having a thickness and either (i) a predominantly columnar microstructure and an internal compressive stress or (ii) a devitrified microstructure and an internal tensile stress, whereby the microstructure of said second thin film is different than the microstructure of said first thin film.