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    • 4. 发明专利
    • HEAT TREATMENT METHOD
    • JPH07254570A
    • 1995-10-03
    • JP4223195
    • 1995-03-02
    • TOKYO ELECTRON LTD
    • TANAKA DAISUKEKITAYAMA HIROBUMI
    • H01L21/302H01L21/22H01L21/3065
    • PURPOSE:To improve the quality of films formed by heating workpieces close to a specified temperature, etching them in a low-pressure etching gas atmosphere to clean their surfaces, and thereafter forming a film on the surfaces in a low-pressure material gas atmosphere. CONSTITUTION:Semiconductor wafers 9a are heated to a specified temperature in a reaction tube 1a. A specified degree of vacuum is maintained in the reaction tube 1a, and further etching gas, such as Ar gas, is introduced there. Thus the semiconductor wafers 9a are cleaned by sputter etching. After the completion of the cleaning, the reaction tube 1a is purged with H2 gas or the like. A specified degree of vacuum is thereafter maintained in the reaction tube 1a by means of a main vacuum exhaust system 7, and further material gas, such as SiH2Cl2, HCl, B2H6 and PH3 gasses, is introduced there. Temperature control is performed so that the temperature of the semiconductor wafers 9a is maintained a specified treatment value, and further films are formed.
    • 7. 发明专利
    • VERTICAL HEAT TREATMENT DEVICE
    • JPH07302767A
    • 1995-11-14
    • JP11768894
    • 1994-05-06
    • TOKYO ELECTRON LTD
    • KITAYAMA HIROBUMIMATSUSHIMA NORIAKI
    • H01L21/22H01L21/205H01L21/31
    • PURPOSE:To improve the maintenability such as cleaning, etc., of the inner vessel of a reaction vessel while avoiding the pollution of workpiece as well as equalizing the processing gas flow for increasing the production yield. CONSTITUTION:The title vertical heat treatment device is composed of a reaction vessel 1 arranged in a heater 5, a bottomed cylindrical outer vessel 2 having lower aperture part, another bottomed cylindrical inner vessel 3 having lower aperture part detachably arranged for containing wafers W through the intermediary of a seal mechanism in the outer vessel 2, besides, a plurality of treatment gas communicating holes 20 in the circumferential direction on the upper part of the inner vessel 3. Through these procedures, the processing gas fed from the leading-in port 11 provided on the lower part of the inner vessel 3 into the inner vessel 3 is dispersed into the treatment gas communicating holes 20 to be externally exhausted from an exhaust port 13 provided on the lower part of the outer vessel 2 through the intermediary of the space between the outer and inner vessels 2 and 3, thereby enabling treatment gas flow to be equalized.