Journal
JOURNAL OF LUMINESCENCE
Volume 132, Issue 9, Pages 2247-2250Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2012.04.011
Keywords
NaYF4:Er3+ microprisms; Upconversion; a-Si:H solar cells
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Funding
- National Key Basic Research Program of China [2011CBA00706]
- National Natural Science Foundation of China [51007082]
- Basis and Frontier Technology Research Plan Projects of Henan of China [102300410075]
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beta-NaYF4:Er3+ (10%) microprisms, synthesized using a hydrothermal method, were applied to the back of a thin film hydrogenated amorphous silicon (a-Si:H) solar cells to investigate response to sub-band gap near-infrared irradiation. Currents of 0.3 mu A and 0.01 mu A were measured during single-illumination with 60 mW (80 mW/cm(2)) 980 nm and 1560 nm diode lasers, respectively, due to frequency upconversion (UC). Under co-excitation by 60 mW 980 nm and 100 mW 1560 nm lasers, a current improvement to 0.54 mu A was obtained, resulting from enhancements in red emission. The finding indicates that co-excitation with multiple wavelengths accessible to UC materials is very effective in enhancing the efficiency of solar cells. (C) 2012 Elsevier B.V. All rights reserved.
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