Patent ID: 8906218

Claim:
A method for forming a porous semiconductor on a plurality of semiconductor wafers, said method comprising: positioning a plurality of wafers in an array in an apparatus, said apparatus comprising: an electrolyte-filled chamber, said chamber operable to open and close, and forming a seal when closed; an anode disposed at a first end of said chamber; a cathode disposed at an opposite end of said chamber, said anode and said cathode coupled to electrical circuitry capable of providing an electrical power comprising electrical voltage and current; a plurality of semiconductor wafers arranged between said anode and said cathode, wherein each said wafer is held in place by a wafer clamp disposed around a perimeter of said wafer, said wafer clamp allowing substantially all of a front and a back surface of each said wafer exposure to said electrolyte; a plurality of vent ports in said chamber for allowing evolved byproduct gas to escape; and anodizing said plurality of wafers according to a pulsed anodization process, said pulsed anodization process alternating an electric current between an on and off state for a sufficient period of time to allow for the dissipation of said byproduct gas formed during anodization.