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 MAPb_0.9Sn_0.1I₃ films with strong absorbance can be obtained. As a result, the best performance up to 18.3% efficiency is achieved. Importantly, the MAPb_0.9Sn_0.1I₃ 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.

Graphic Abstract

中文翻译：

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少量锡取代甲基铵碘化铅可实现高效稳定的理想带隙钙钛矿型太阳能电池

摘要

铅-锡（Pd-Sn）有机-无机混合钙钛矿吸收体的理想带隙约为1.4 eV，对于进一步提高钙钛矿太阳能电池（PVSC）的功率转换效率至关重要。然而，由于Sn ²⁺的容易氧化，大量的Sn取代的Pb基PVSC在周围环境中稳定性较低。在这项工作中，我们通过向甲基铵碘化铅（MAPbI ₃）中引入少量（10 mol％）Sn ²⁺实现了理想的带隙钙钛矿。可以获得具有强吸收性的大晶粒度的MAPb _0.9 Sn _0.1 I ₃膜。结果，达到了高达18.3％的效率。重要的是，MAPb _0.9 Sn _0.1我₃单元保持90％的在全1-太阳照明的最大功率点500小时操作之后其性能，而相比之下，MAPbI的快速降解₃细胞。这项研究证明了稳定和有效的理想带隙Pb-Sn PVSC的潜在潜力。

图形摘要