Patent ID: 7871932

Claim:
A semiconductor device manufacturing method including a step of thermally processing a wafer placed in a chamber, the thermal process comprising the steps of: measuring an emissivity of a wafer placed in the chamber; calculating a fluctuation rate of a wafer physical quantity that fluctuates in association with a given thermal energy quantity based on an estimate expression, which are obtained in advance, presenting a relationship between a thermal energy quantity emitted from a heat source for heating the wafer placed in the chamber, wafer emissivity and the wafer physical quantity fluctuation rate and on the measured emissivity; calculating a processing time for the physical quantity to be a specific value based on the calculated fluctuation rate; and conducting the thermal process for the calculated processing time, wherein the estimate expression includes a virtual thermal energy loss, the thermal process is conducted in a lamp heating thermal processing apparatus and the thermal energy loss is calculated based on a pressure in the lamp chamber.