Efficient luminescent solar cells based on tailored mixed-cation perovskites
By Dongqin Bi, W. Tress, M. I. Dar, P. Gao, Jingshan Luo, Clémentine Renevier, K. Schenk, A. Abate, F. Giordano, J. C. Baena and 6 more. Science Advances, 2016
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Researchers developed a perovskite solar cell with high power-conversion efficiency (>20%) and intense electroluminescence yield (0.5%). We report on a new metal halide perovskite photovoltaic cell that exhibits both very high solar-to-electric power-conversion efficiency and intense electroluminescence. We produce the perovskite films in a single step from a solution containing a mixture of FAI, PbI2, MABr, and PbBr2 (where FA stands for formamidinium cations and MA stands for methylammonium cations). Using mesoporous TiO2 and Spiro-OMeTAD as electron- and hole-specific contacts, respectively, we fabricate perovskite solar cells that achieve a maximum power-conversion efficiency of 20.8% for a PbI2/FAI molar ratio of 1.05 in the precursor solution. Rietveld analysis of x-ray diffraction data reveals that the excess PbI2 content incorporated into such a film is about 3 weight percent. Time-resolved photoluminescence decay measurements show that the small excess of PbI2 suppresses nonradiative charge carrier recombination. This in turn augments the external electroluminescence quantum efficiency to values of about 0.5%, a record for perovskite photovoltaics approaching that of the best silicon solar cells. Correspondingly, the open-circuit photovoltage reaches 1.18 V under AM 1.5 sunlight.
Subfields: Electrical and Electronic Engineering, Materials Chemistry, Polymers and Plastics
View Paper: https://www.semanticscholar.org/paper/bfc9c0ee93cef5340ba9899d7c299b6d7fed2cd8
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