期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 539, 期 -, 页码 598-608出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2018.12.100
关键词
Cu2ZnSn(S1-x,Se-x)(4)-Au; Localized surface plasmon resonance; Photocathode; Solar cell; Impedance spectroscopy; Perovskite
资金
- National Natural Science Foundation of China [61604086, 21776147]
- International Science & Technology Cooperation Program of China [2014DFA60150]
- Department of Science and Technology of Shandong Province [2016GGX104010, ZR2018BB066]
- Department of Education of Shandong Province [J16LA14]
- Malmstrom Endowment Fund at Hamline University
We concretely report feasible synthesis procedures of colloidal Cu2ZnSn(S1-xSex)(4)-Au (CZTSSe-Au) nano-heterostructured composites, and creatively employ them as the counter electrodes (CEs) of all-solidstate solar cells with inorganic CsSnI2.95F0.05 perovskite hole conductor. Acquired optical characterization indicates that integration of noble metal nanoparticles with cuprum-chalcogenide could heighten light absorption within visible-band due to localized surface plasmon resonance (LSPR) generated by Au, and the forbidden gap of nanocomposites gets adjustment accordingly. It is demonstrated that this novel photocathode alternative with favorable conductivity can not only match the energy level within the device band structure construction, but also restrain recombination so that accelerate charge transfer and extraction occurring on the photocathode. The photocurrent and photoelectric conversion efficiency (PCE) of cells conjugating CZTS-Au photocathodes turn to be respectively 43% and 25% higher than those using pure CZTS. Moreover, it has been demonstrated that CZTS-Au, coupling very well with inorganic perovskite, owns comparable electrocatalytic performance and even higher output photocurrent with respect to platinum CEs, which portends a potential substitution for conventional costly photocathodes. A comprehensive analysis on impedance spectroscopy data is subsequently carried out for the sake of deep understanding charge accumulation and transfer response at CsSnI2.95F0.05/CE interface, attempting to orient further optimization of device performance. (C) 2018 Elsevier Inc. All rights reserved.
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