Journal
SOLAR ENERGY
Volume 147, Issue -, Pages 126-132Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.solener.2017.03.045
Keywords
Dye-sensitized solar cells; Metal organic frameworks; Cobalt trisbipyridine
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Funding
- National Natural Science Foundation of China [51502224]
- Hubei Provincial Natural Science Foundation [2016CFB118]
- Fundamental Research Funds for the Central Universities (Wuhan University of Technology, WUT) [2015IVA052]
- Students innovation and entrepreneurship training program [20151049701026]
- Beijing National Laboratory for Molecular Sciences (BNLMS)
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A very thin blocking layer of a metal organic framework ZIF-8 has been successfully coated on the surface of mesoporous TiO2 films. Compared to the uncoated samples, dye-sensitized solar cells with such films exhibit enhanced open circuit voltage (V-oc) and short circuit current (Jsc) by 3% and 21%, respectively, leading to a 9.42% energy conversion efficiency using tris(2,2'-bipyridine) cobalt(II)/(III) redox mediator. The electron lifetimes as well as dye loading on TiO2 working electrodes were found to increase after ZIF-8 treatment, which is responsible for the improvement of Jsc. An increase of charge recombination resistance between working electrode and organic electrolyte, as is characterized by electrochemical impedance spectra, is proposed to be the reason for the increased Voc, as there is no TiO2 conduction band shift after the treatment of ZIF-8. (C) 2017 Elsevier Ltd. All rights reserved.
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