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Final Report

Description: The objective of this DOE SAI project is to demonstrate the feasibility of electrodeposited and solution-doped transparent conducting oxides (TCOs) such as zinc oxide with resistivity in the mid-10{sup -4} {Omega}-cm range. The target application is an 'on-top' TCO which can be deposited on semiconductors in thin-film and future solar cells including amorphous silicon, copper indium gallium selenide and emerging solar cells. There is no solution-prepared on-top TCO currently used in commercial solar cells. This project, if successful, will fill this gap. Our technical objectives include electrodeposited TCOs with (1) resistivity in the mid-10{sup -4} {Omega}-cm range, (2) post-deposition annealing below 300 C and (3) no-vacuum processing or low-vacuum processing. All the three research objectives listed above have been accomplished in the 14-month period from July 1, 2009 through September 30, 2010. The most noticeable accomplishments of this project are (1) identification of a terawatt-scale dopant for zinc oxide, i.e. yttrium, whose known reserve is enough for 60 peak terawatts of thin-film solar cells; (2) demonstration of a record-low resistivity, 6.3 x 10{sup -5} {Omega}-cm, in solution-deposited zinc oxide with an abundant dopant; and (3) the record-low resistivity was accomplished with a maximum process temperature of 300 C and without vacuum annealing. Industrial applications of the new yttrium-doped zinc oxide are being pursued, including (1) green deposition of yttrium-doped zinc oxide to reduce water consumption during deposition and (2) search for an industrial partner to develop an electrochemical tool for large-area uniform deposition of yttrium-doped zinc oxide.
Date: December 22, 2010
Creator: Tao, Dr. Meng
Partner: UNT Libraries Government Documents Department