Abstract
Ideal bandgap ~ 1.4 eV of lead–tin (Pd–Sn) organic–inorganic hybrid perovskite absorber is essential to further enhance the power conversion efficiency of perovskite solar cells (PVSCs). However, due to the facile oxidation of Sn2+, large amount of Sn substituted Pb based PVSCs suffer with low stability in ambient environment. In this work, we realize an ideal bandgap perovskite by introducing a small amount (10 mol%) of Sn2+ to methylammonium lead iodide (MAPbI3). A large grain size MAPb0.9Sn0.1I3 films with strong absorbance can be obtained. As a result, the best performance up to 18.3% efficiency is achieved. Importantly, the MAPb0.9Sn0.1I3 cell retains 90% of its performance after operation at the maximum power point under full 1-sun illumination for 500 h, in contrast to the quick degradation of MAPbI3 cell. This study demonstrates the promising potential of stable and efficient ideal band-gap Pb–Sn PVSCs.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Grant No. 11747166), the Fundamental Research Funds for the Central Universities (Grant No. 2017-KYYWF-0144), University Nursing Program for Young Scholars with Creative Talents in Heilongjiang Province (Grant No. UNPYSCT-2018185), Excellent Youth Project of Heilongjiang Natural Science Foundation (Grant No. JJ2019YX0314), Doctoral Research Initiation Fund of Harbin Normal University (Grant No. XKB201915), Y. Yin would like to thank the funding of the visiting program, which is supported by China Scholarship Council (CSC). SMA, TA, and YY thank to Researchers Supporting Project Number (RSP-2019/6), King Saud University, Riyadh, Saudi Arabia.
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Yin, Y., Fu, S., Zhou, S. et al. Efficient and Stable Ideal Bandgap Perovskite Solar Cell Achieved by a Small Amount of Tin Substituted Methylammonium Lead Iodide. Electron. Mater. Lett. 16, 224–230 (2020). https://doi.org/10.1007/s13391-020-00206-3
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DOI: https://doi.org/10.1007/s13391-020-00206-3