Patent ID: 6235563
Filing Date: 2001-05-22
Classification: H01L

Abstract:
A method of forming a semiconductor device having a polycrystalline film comprising the steps of:(a) forming by plasma CVD a noncrystalline semiconductor film whose main composition is silicon on an insulating support in a temperature range of about room temperature to 350.degree. C.,(b) thermally treating the noncrystalline semiconductor film at a first prescribed temperature by monotonically increasing its temperature at least at one predetermined temperature rise rate per unit time between the film formation temperature and said first prescribed temperature to bring about solid phase recrystallization and the formation of a polycrystalline film wherein a polycrystalline film is obtained containing polycrystalline grains equal or larger than 1 .mu.m in diameter, and(c) thermally treating the polycrystalline film at a second prescribed temperature higher than said first prescribed temperature by monotonically increasing the applied temperature at a predetermined temperature rise rate per unit time between said first prescribed temperature and said second prescribed temperature to form an oxidation layer thereon.