Patent ID: 11908703
Assignee: SCREEN HOLDINGS CO., LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 6:
7. A method of irradiating a substrate with light to heat the substrate, said method comprising the steps of:
(a) sequentially transporting multiple dummy wafers into a chamber and placing the dummy wafers on a susceptor before a substrate to be treated is transported into said chamber;
(b) irradiating a back surface of each dummy wafer in a first group among said multiple dummy wafers with light from a continuous lighting lamp, and thereafter irradiating a front surface of each dummy wafer in the first group with a flash of light from a flash lamp to heat each dummy wafer in the first group to a first heating temperature;
(c) measuring, as a judgment temperature, a predetermined temperature at a time when a predetermined time period has elapsed since turning off of said continuous lighting lamp and said flash lamp upon completion of heating of each dummy wafer in the first group; and
(d) irradiating a back surface of each dummy wafer in a second group among said multiple dummy wafers with light from said continuous lighting lamp, and thereafter irradiating a front surface of each dummy wafer in the second group with a flash of light from said flash lamp to heat each dummy wafer in the second group to a second heating temperature lower than said first heating temperature, said step (d) being started after said judgment temperature falls within a predetermined range with respect to a target temperature,
wherein said judgment temperature is a temperature of the back surface of each dummy wafer in the first group or an atmosphere temperature in said chamber.