Patent ID: 7084068

Claim:
An annealing furnace, comprising: a processing chamber configured to store a substrate; a susceptor located in the processing chamber so as to load the substrate and having an auxiliary heater for heating the substrate at 650° C. or less, the susceptor having a surface made of quartz; a gas supply system having a variety of gas sources required for a thermal processing on the substrate, the gas sources including one of a reduction gas and a gas containing halogen for removing a native oxide film formed on the substrate; an introduction conduit connected to the gas supply system configured to supply a gas in parallel to a surface of the substrate; an exhaust conduit facing the introduction conduit configured to exhaust the gas from the processing chamber; a protective member made of quartz configured to prevent oxidation or corrosion on side and bottom inner walls in the processing chamber; a transparent window located on an upper part of the processing chamber facing the susceptor; and a main heater configured to irradiate a pulsed light on the surface of the substrate to heat the substrate from the transparent window, the pulsed light having a pulse duration of approximately 0.1 ms to 200 ms and having a plurality of emission wavelengths.