Patent ID: 6706549
Filing Date: 2004-03-16
Classification: B81B,B81C,G01P

Abstract:
A method of making a SiC accelerometer from a SiC wafer, said SiC wafer comprising p-type SiC substrate and an n-type SiC epilayer, comprising the steps of:applying a layer of oxide on said n-type epilayer of said SiC; applying a first layer of photoresist on said layer of oxide; masking said first layer of photoresist with ultraviolet light imidizing a portion of said first layer of photoresist and stripping away said imidized photoresist with developer and leaving unimidized photoresist on said layer of oxide; dry etching exposed oxide; removing the unimidized first layer of photoresist; depositing contact metallization; depositing Aluminum on said contact metallization; applying a second layer of photoresist on said Aluminum; masking said second layer of photoresist with ultraviolet light imidizing a portion of said second layer of photoresist and stripping away said imidized portion of said second layer of photoresist with developer and leaving behind unimidized photoresist; etching Aluminum not covered by unimidized photoresist; removing unimidized photoresist; dry etching said contact metallization not covered by Aluminum; applying a third layer of photoresist to said Aluminum and said oxide and masking said third layer of photoresist imidizing a portion of said photoresist and stripping away said imidized portion of said photoresist leaving behind unimidized photoresist; applying a masking layer selected from the group consisting of Indium Tin Oxide and Nickel over said Aluminum, said oxide and said unimidized photoresist leaving a portion of said unimidized photoresist exposed; removing said unimidized portion of said third layer of photoresist together with said a portion of said masking layer selected from the group of Indium Tin Oxide and Nickel which covers said unimidized photoresist; and, dry etching portions of said oxide, said n-type epilayer of said SiC substrate and said p-type SiC substrate which are not protected by said masking layer selected from the group consisting of Indium Tin Oxide and Nickel; and, dissolving said Aluminum and said masking layer.