Importance

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Abstract

A semiconductor wafer (1) is thermally treated in a prescribed heating cycle while it is introduced into a furnace casing (4) of a furnace (4) and discharged therefrom. A temperature of a monitor chip (11) is measured by a radiation thermometer (16) immediately before introduction of the semiconductor wafer and memorized as an idling temperature. Then, while the furnace is heated up in order to make a measured temperature of the monitor chip agree with the idling temperature without the semiconductor wafer introduced, a temperature of the furnace casing is measured by a radiation thermometer (8) and memorized as a warm-up temperature. The furnace is controlled on the basis of the warm-up temperature or the idling temperature prior to sequential heat treatment of a number of semiconductor wafers.

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First Claim