Journal
ELECTROCHIMICA ACTA
Volume 182, Issue -, Pages 416-423Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2015.09.023
Keywords
Organic/inorganic hybrid solar cell; Charge-transfer dynamics; Two-photon up-conversion mechanism; Bulk-heterojunction
Categories
Funding
- Natural Science Foundation of China [61366003, 11404283, 11564026]
- National Natural Science Foundation of Guangdong Province, China [2014A030307028]
- Natural Science Foundation of Jiangxi Province [20151BAB212001]
- Science and Technology Project of the education department of Jiangxi Province, China [GJJ12449, GJJ14533]
- Distinguished Young Talents in Higher Education of Guangdong, China [2013LYM 0053]
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Solar light harvesting ability is one of the key properties in organic/inorganic solar cells. One of the most popular organic materials used is poly(3-hexylthiophene) (P3HT), which can make use of solar spectrum in the range 400-600 nm, however, this polymer is incapable of utilizing low energy photons. Herein, we incorporate erbium ion decorated gadolinium oxymolybdate (GMO:Er) nanophosphors (NPs) into mesoporous acceptor film (TiO2) in an attempt to enhance the light harvest. The nanophosphor can convert the near-infrared solar spectrum to visible region (near 550 nm), in which the energy can be recaptured by P3HT. The results show that the up-conversion proceeds via the two-photon upconversion mechanism. It is found that after the incorporation of GMO:Er NPs into TiO2 at 5 wt%, the charge transfer rate was enhanced from 2.79 to 5.83 x 10(9) s(-1). The device performance of solar cells based on GMO: Er NPs demonstrates a more than 30% improvement compared to their neat TiO2/P3HT analogue and such enhancement can be ascribed to the broader light harvest together with faster photoexcited charge transfer. This platform can be readily implemented by introducing more demanding energy conversion phosphors and allows for the development of optoelectronic applications with tailored optoelectronic properties. (C) 2015 Elsevier Ltd. All rights reserved.
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