Limit of incorporating cesium cations into formamidinium-methylammonium based mixed halide perovskite solar cells
Limit of incorporating cesium cations into formamidinium-methylammonium based mixed halide perovskite solar cells
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DOI：
10.1088/1361-6528/ab6230
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发表时间：
2019-12
期刊：
影响因子：
3.5
通讯作者：
Pravakar P. Rajbhandari;T. Dhakal
中科院分区：
文献类型：
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作者：
Pravakar P. Rajbhandari;T. Dhakal
将甲脒鎓（FA）掺杂到基于甲基铵（MA）的钙钛矿中带来了显着的热稳定性和环境稳定性，包括最佳的器件性能。已经表明，添加铯（Cs）也使钙钛矿在热力学稳定性方面稳健。我们探索了将Cs结合到混合阳离子（FA/MA）和混合卤化物（I/Br）的基础钙钛矿中的方法，该基础钙钛矿通过相互扩散方法具有高性能的良好记录。通过这种方法，已经表明钙钛矿形成光滑的膜而没有任何残留的PbI 2，并且表现出更高的吸光度。随着Cs含量的增加，PbI 2的残留量逐渐消失，但当Cs含量大于15%时，薄膜表面变得粗糙。添加少量的PbCl 2允许包含更多的Cs含量，这导致平滑的膜表面和进一步改善的器件性能。
Incorporating formamidinium (FA) into methylammonium (MA) based perovskite has brought significant thermal and environmental stability including best device performance. It has been shown that addition of Cesium (Cs) makes perovskite robust in terms of thermodynamic stability as well. We explore the means of incorporating Cs into a base perovskite of mixed cation (FA/MA) and mixed halide (I/Br) that has a proven track record of high performance through an inter-diffusion approach. With this approach, it has been shown that perovskites form a smooth film without any residual PbI2 and exhibit higher absorbance. Though the residual PbI2 disappeared with the increase in added Cs, the film morphology became rough for Cs concentration higher than 15%. Addition of small amounts of PbCl2 allowed inclusion of more Cs content, which resulted in smooth film surface and further improved device performance.