Abstract
Ideal bandgap similar to 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 (MAPbI(3)). A large grain size MAPb(0.9)Sn(0.1)I(3) films with strong absorbance can be obtained. As a result, the best performance up to 18.3% efficiency is achieved. Importantly, the MAPb(0.9)Sn(0.1)I(3) 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 MAPbI(3) cell. This study demonstrates the promising potential of stable and efficient ideal band-gap Pb-Sn PVSCs.
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