Impact of cesium on the phase and device stability of triple cation Pb–Sn double halide perovskite films and solar cells
Impact of cesium on the phase and device stability of triple cation Pb–Sn double halide perovskite films and solar cells
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DOI：
10.1039/c8ta06391e
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发表时间：
2018-09
影响因子：
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通讯作者：
Gabriella A. Tosado;Yi-Yu Lin;Erjin Zheng;Qiuming Yu
中科院分区：
文献类型：
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作者：
Gabriella A. Tosado;Yi-Yu Lin;Erjin Zheng;Qiuming Yu
三元阳离子Cs/甲铵(MA)/甲酰胺(FA)和双卤化物BR/I铅提高了钙钛矿型太阳电池的稳定性和效率。然而，它们对合金化的铅锡钙钛矿的影响还没有被探索。在本工作中，采用一步溶液法和反溶剂清洗技术合成了组成为Csx(MA0.17FA0.83)1−xPb1−ySnY(I0.83Br0.17)3的钙钛矿型薄膜，并将其应用于倒置结构的PVSCs中。所有的薄膜都显示出立方晶体结构，表明通过成分调节公差系数和结晶速率可以形成致密的单相。富铅或富锡钙钛矿的带隙受晶格收缩和八面体倾斜的影响，随着Cs含量的增加而呈现相反的趋势。Cs0.05(MA0.17FA0.83)0.95Pb0.25Sn0.75(I0.83Br0.17)3 PVSC的功率转换效率达到11.05%，创下了任何含有75%锡钙钛矿的PVSC的记录，而Cs0.10(MA0.17FA0.83)0.90Pb0.75Sn0.25(I0.83Br0.17)3 PVSC的功率转换效率达到了15.78%。此外，三重阳离子和双卤化物合金化的铅锡钙钛矿材料在惰性和常温条件下表现出更好的器件稳定性。这项研究阐明了阳离子和卤化物调谐对合金化的铅锡钙钛矿结构的影响，可用于进一步消除铅并改善高锡PVSCs和其他光电器件的器件性能。
Triple cation Cs/methylammonium (MA)/formamidinium (FA) and double halide Br/I lead perovskites improved the stability and efficiency of perovskite solar cells (PVSCs). However, their effects on alloyed Pb–Sn perovskites are unexplored. In this work, perovskite thin films with the composition Csx(MA0.17FA0.83)1−xPb1−ySny(I0.83Br0.17)3 are synthesized utilizing a one-step solution process plus an anti-solvent wash technique and deployed in PVSCs with an inverted architecture. All films show a cubic crystal structure, demonstrating that compositional tuning of both the tolerance factor and crystallization rate allows for dense, single phase formation. The band gaps, affected by both lattice constriction and octahedral tilting, show opposite trends in Pb-rich or Sn-rich perovskites with the increase of Cs for fixed Sn compositions. The Cs0.05(MA0.17FA0.83)0.95Pb0.25Sn0.75(I0.83Br0.17)3 PVSCs achieve a power conversion efficiency (PCE) of 11.05%, a record for any PVSC containing 75% Sn perovskites, and the Cs0.10(MA0.17FA0.83)0.90Pb0.75Sn0.25(I0.83Br0.17)3 PVSCs reach a record PCE of 15.78%. Moreover, the triple cation and double halide alloyed Pb–Sn perovskites exhibit improved device stability under inert and ambient conditions. This study, which illustrates the impact of cation and halide tuning on alloyed Pb–Sn perovskites, can be used to further eliminate Pb and improve device performance of high Sn PVSCs and other optoelectronic devices.