Multilayer ohmic contact for p-type semiconductor and method of making same
Patent 4680611 Issued on July 14, 1987. Estimated Expiration Date: 
December 28, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 28, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3268309 3370207 3465428 Ohmic contacts to p-type mercury cadmium telluride Insulated-gate thin film transistor with low leakage current Ohmic contacts to p-type mercury cadmium telluride Thin film heterojunction photovoltaic cells and methods of making the same Method of forming ohmic contacts Patent #: 4456630 InventorAssigneeApplicationNo. 06/687092 filed on 12/28/1984US Classes:136/256, Contact, coating, or surface geometry136/260, Cadmium containing257/762, At least one layer containing silver or copper257/766, At least one layer containing chromium or nickel257/E21.478, From gas or vapor, e.g., condensation (EPO)257/E21.479, From liquid, e.g., electrolytic deposition (EPO)257/E29.143Ohmic electrodes (EPO)ExaminersPrimary: James, Andrew J.Assistant: Mintel, William Attorney, Agent or FirmInternational ClassesH01L 21/02 (20060101)H01L 29/40 (20060101) H01L 21/443 (20060101) H01L 21/445 (20060101) H01L 29/45 (20060101) AbstractNovel ohmic contacts are provided for p-type semiconductor compounds comprising at least one of the metals of Class IIB of the Periodic Table of Elements and one of the non-metal elements of Class VIA of the Periodic Table of Elements, as well as a method for forming such novel ohmic contacts. These ohmic contacts comprise a multilayer metal contact wherein the first layer provides a lasting stable contact with the p-type semiconductor; the additional layers provide the necessary electrical conductivity for the contact to be efficient.Other References
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