Patent ID: 6207591
Filing Date: 2001-03-27
Classification: H01L

Abstract:
A method for manufacturing a semiconductor device employing an equipment having an annealing tube, a resistive heater positioned adjacently to the annealing tube and IR (infrared) lamps positioned adjacently to the annealing tube and the resistive heater, the method comprising the steps of:(a) heating a semiconductor substrate disposed in the annealing tube from an initial temperature up to a first annealing temperature at a first heating rate by increasing an input power for the IR lamps, while keeping an input power for the resistive heater in a low level such that a thermal energy emitted by the resistive heater is lower than that from the IR lamps so as not to contribute to the first annealing temperature, and then maintaining the first annealing temperature for a predetermined period, and thereby performing a first annealing on said semiconductor substrate;(b) decreasing temperature of said semiconductor substrate from said first annealing temperature to a second annealing temperature, which is higher than said initial temperature and lower than said first annealing temperature, at a first cooling rate by decreasing the input power for the IR lamps, while increasing the input power for the resistive heater so as to attain the second annealing temperature;(c) maintaining said second annealing temperature for a predetermined period and thereby performing a second annealing on said semiconductor substrate by controlling the input power for the resistive heater; and(d) cooling said semiconductor substrate at a second cooling rate by decreasing the input power for the resistive heater.