Patent ID: 6410434
Filing Date: 2002-06-25
Classification: C23C,H01L,Y10S

Abstract:
A method for forming a doped amorphous semiconductor film on a plurality of semiconductor wafers, the method including the steps of:A. placing said plurality of semiconductor wafers in a reaction chamber; B. setting a pressure within said reaction chamber to be less than approximately 1.0 Torr; C. setting a temperature within the reaction chamber to a predetermined temperature in a range of from about 500Â° Celsius to about 550Â° Celsius; and D. flowing a semiconductor film reactant and a dopant reactant into said reaction chamber through at least two gas inlets, each gas inlet being disposed on a respective location of said reaction chamber near said plurality of semiconductor wafers; wherein said doped amorphous semiconductor film is formed from said semiconductor film reactant with in-situ doping from said dopant reactant on said plurality of semiconductor wafers in a LPCVD (Low Pressure Chemical Vapor Deposition) process; and wherein said plurality of wafers are placed into a boat holding said plurality of wafers in a stacked configuration along a vertical dimension of said reaction chamber, and wherein said at least two gas inlets are arranged linearly along said vertical dimension of said reaction chamber near said stacked configuration of said plurality of semiconductor wafers; and wherein each of said at least two gas inlets carries both of said semiconductor film reactant and said dopant reactant; and wherein said dopant reactant flows through a bottom gas inlet of said at least two gas inlets with a first flow rate, and wherein said dopant reactant flows through an upper gas inlet of said at least two gas inlets with a second flow rate; and wherein said upper gas inlet is disposed above said bottom gas inlet along said vertical dimension of said reaction chamber, and wherein said second flow rate of said dopant reactant through said upper gas inlet is greater than said first flow rate of said dopant reactant through said bottom gas inlet.