Methods of making pn CdTe/CdS thin film solar cells
Patent 5304499 Issued on April 19, 1994. Estimated Expiration Date: 
September 28, 2012. 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.
September 28, 2012. 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 ReferencesPolycrystalline thin film CdS/CdTe photovoltaic cell Photoelectric element, picture-reading device including the same, and process for production thereof Thin film cadmium telluride solar cell Patent #: 4650921 InventorsAssigneeApplicationNo. 929514 filed on 09/28/1992US Classes:438/94, Heterojunction136/260, Cadmium containing136/264, Selenium or tellurium containing427/76, Coating is selenium, tellurium, or compound thereof438/967SEMICONDUCTOR ON SPECIFIED INSULATORExaminersPrimary: Weisstuch, AaronAttorney, Agent or FirmForeign Patent References
International ClassesH01L 031/18H01L 031/072 Foreign Application Priority Data1991-10-03 DEAbstractA method of making pn CdTe/CdS thin film solar cells, in which a transparent TCO layer is deposited as a front contact on a transparent substrate in the form of inexpensive soda-lime glass, and is preferably provided with an ultra-thin indium layer, which is in turn coated with the CdS layer, wherein the thus coated substrate is brought to the CdTe coating at a temperature between 480° C. and 520° C., which is maintained during the ensuing rapid CdTe deposition using the close-spaced sublimation method with a preferred rate of deposition of 5 to 15 μm/min in an inert atmosphere. The indium layer dissolves during this deposition and effects the necessary n-doping of the CdS layer, without an additional method step. Solar cells can be made in this way with high efficiency in an inexpensive method, suitable for mass production.Other References
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