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Title: | Enhanced near-infrared response of a-Si:H solar cells with beta-NaYF4:Yb3+ (18%), Er3+ (2%) upconversion phosphors | Authors: | DE WILD, Jessica Rath, JK Meijerink, A van Sark, WGJHM Schropp, REI |
Issue Date: | 2010 | Publisher: | ELSEVIER | Source: | Solar energy materials and solar cells, 94 (12) , p. 2395 -2398 | Abstract: | A near-infrared to visible upconversion phosphor (beta-NaYF4:Yb3+ (18%), Er3+ (2%)) has been applied at the back of a thin film hydrogenated amorphous silicon (a-Si:H) solar cell in combination with a white back reflector to investigate its response to sub-bandgap infrared irradiation. Current-voltage measurements were performed on the solar cells. A maximum current enhancement of 6.2 mu A was measured on illumination with a 980 nm diode laser at 28 mW. This corresponds to an external quantum efficiency (EQE) of 0.03% of the solar cell. A small part, 0.01%, was due to the direct absorption of sub-bandgap radiation but the larger part originates from upconversion. These experiments constitute a proof-of-principle for the utilization of photon upconversion in thin film solar cells. A close match between the non-linear behavior of the upconversion material and the EQE was found by varying the intensity of the laser light. (C) 2010 Elsevier B.V. All rights reserved. | Keywords: | Upconversion;a-Si:H solar cells;Thin film | Document URI: | http://hdl.handle.net/1942/31689 | ISSN: | 0927-0248 | e-ISSN: | 1879-3398 | DOI: | 10.1016/j.solmat.2010.08.024 | ISI #: | WOS:000283959500065 | Rights: | 2010 Elsevier B.V. All rights reserved | Category: | A1 | Type: | Journal Contribution |
Appears in Collections: | Research publications |
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