Patent ID: 6261930
Filing Date: 2001-07-17
Classification: H01L

Abstract:
A method for forming a hemispheric-grain polysilicon layer, said method comprising:forming an amorphous-silicon layer on a substrate in a first vacuum-furnace;removing a native oxide layer which is formed and accompanied with said amorphous-silicon;increasing temperature of a second vacuum-furnace apparatus to an estimated temperature;loading said wafer into said second vacuum-furnace apparatus;first conducting gas into said second vacuum-furnace apparatus and ceasing the gas;conducting gas into said second vacuum-furnace apparatus to said polysilicon layer while increasing the temperature of the vacuum-furnace apparatus then transmitting gas into the furnace and then ceasing the gas thereafter repeating said transmitting gas and said ceasing gas until said hemispherical-grain polysilicon layer is formed so that throughput thus increasing herein the process time for said polysilicon layer thus decreasing thereby forming said polysilicon layer.