Final Report Page: 1 of 10
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DE-EE0000577 Final Report
Electrodeposited TCOs for Thin-Film and Future Solar Cells
DOE Grant No.: DE-EE0000577
Recipient: University of Texas at Arlington
Working Partner: HelioVolt Corporation
Principal Investigator: Prof. Meng Tao
Quoted from the Proposal: "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-10-4 Q-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-10-4 Q-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, 6.3x10-5 Q-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.
Total: 10 pages
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Tao, Dr. Meng. Final Report, report, December 22, 2010; United States. (digital.library.unt.edu/ark:/67531/metadc833903/m1/1/: accessed February 18, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.