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Yongqi Yin,Sufang Fu,Sheng Zhou,Yuling Song,Lin Li,Mingyi Zhang,Jie Wang,Pandiyarajan Mariyappan,Saad M. Alshehri,Tansir Ahamad,Yusuke Yamauchi 대한금속·재료학회 2020 ELECTRONIC MATERIALS LETTERS Vol.16 No.3
Ideal bandgap ~1.4 eV of lead–tin (Pd–Sn) organic–inorganic hybrid perovskite absorber is essential to further enhance thepower conversion efciency of perovskite solar cells (PVSCs). However, due to the facile oxidation of Sn2+, large amount ofSn substituted Pb based PVSCs sufer with low stability in ambient environment. In this work, we realize an ideal bandgapperovskite by introducing a small amount (10 mol%) of Sn2+ to methylammonium lead iodide (MAPbI3). A large grain sizeMAPb0.9Sn0.1I3 flms with strong absorbance can be obtained. As a result, the best performance up to 18.3% efciency isachieved. Importantly, the MAPb0.9Sn0.1I3 cell retains 90% of its performance after operation at the maximum power pointunder full 1-sun illumination for 500 h, in contrast to the quick degradation of MAPbI3 cell. This study demonstrates thepromising potential of stable and efcient ideal band-gap Pb–Sn PVSCs.