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Photoconductive ZnO films with embedded quantum dot or ruthenium dye sensitizers

Author(s): Michael A. White | Jillian L. Dempsey | Gerard M. Carroll | James D. Gallagher | Daniel R. Gamelin

Journal: APL Materials
ISSN 2166-532X

Volume: 1;
Issue: 3;
Start page: 032107;
Date: 2013;
Original page

We report a new type of solution-processed photoconductive film based on embedding photosensitizers (semiconductor nanocrystals or ruthenium dye molecules) within conductive ZnO sol-gel matrices. Mixing photosensitizers directly with sol-gel precursors prior to film deposition yields highly colored ZnO films containing well-dispersed sensitizers. These films show internal photoconductivity quantum efficiencies up to ∼50% and photoresponses over 100 mA/W with visible photoexcitation, competitive with other more complex photodetectors reported recently. This simple motif is attractive for the development of robust sensitized-oxide photodetectors and for fundamental studies of photoinduced charge separation from a variety of molecular or quantum dot sensitizers into conductive oxides.
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