Patent ID: 6127658
Filing Date: 2000-10-03
Classification: H01L

Abstract:
Heating apparatus particularly useful for rapid thermal processing of semiconductor wafers, comprising:a head having a wafer support for supporting a wafer spaced above the head;a radiation heater located above the wafer when supported on the head;an optical fiber having one end exposed to the space between the wafer and said head for detecting the radiation emitted by the wafer;a heat measuring device at the opposite end of the optical fiber for producing a temperature measurement corresponding to the radiation emitted by the wafer; anda peripheral barrier circumscribing said head, and the wafer spaced above the head, for blocking stray radiation from entering the space between the wafer and the head from the outer periphery of the head;wherein said wafer support supporting the wafer is spaced from said peripheral barrier by an annular gap which includes an annular radiation-absorptive barrier projecting outwardly of the wafer towards said radiation heater to block all but low angle radiation from entering said annular gap.