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Tin (Sn)–lead (Pb) mixed perovskite solar cells (PSCs) stand out as the optimal choice for the bottom subcell of the all‐perovskite tandem solar cells. One of the major challenges impeding the further enhancement of Sn–Pb mixed PSCs power conversion efficiency (PCE) is the easy oxidation of Sn2+ to Sn4+ and a large number of Sn vacancies in the perovskite films. In this work, the sources of Sn2+ oxidation...
2D perovskites have attracted wide attention for optoelectronic applications because of their unique layer structure and tunable outstanding optical/electrical properties. In addition, 2D Cs3Bi2Br9 nanoflakes possess large effective atomic number, high resistivity, high density as well as excellent stability, rendering it a promising material for X‐ray detection. Nevertheless, it is full of challenges...
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