Monitoring the Phase Formation of Coevaporated Lead Halide Perovskite Thin Films by in Situ X-ray Diffraction.
Monitoring the Phase Formation of Coevaporated Lead Halide Perovskite Thin Films by in Situ X-ray Diffraction.
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DOI：
10.1021/jz5017312
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发表时间：
2014-09
期刊：
影响因子：
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通讯作者：
P. Pistor;J. Borchert;W. Fränzel;R. Csuk;R. Scheer
中科院分区：
文献类型：
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作者：
P. Pistor;J. Borchert;W. Fränzel;R. Csuk;R. Scheer
基于（CH 3 NH3）Pb（I，Cl）3的Percent太阳能电池最近显示出快速增加的电池效率。在这里，我们展示了在不同的沉积条件下使用两个源的基于真空的共蒸发方法的（CH 3 NH3）Pb（I，Cl）3钙钛矿薄膜的生长过程中存在的相识别的进展。通过原位X射线衍射，可以真实的实时识别和监控晶相。对于不同的（CH 3 NH3）I与PbCl 2通量比，两种不同的（CH 3 NH3）Pb（IxCl（1-x））3相（x > 0.95），且较低（x < 0.5）碘含量以及在-在沉积后退火过程中，我们观察到再结晶和择优取向效应，并最终在200 ℃以上的温度下分解为PbI 2摄氏度。
Perovskite solar cells based on (CH3NH3)Pb(I,Cl)3 have recently demonstrated rapidly increasing cell efficiencies. Here, we show progress identifying phases present during the growth of (CH3NH3)Pb(I,Cl)3 perovskite thin films with the vacuum-based coevaporation approach using two sources under varying deposition conditions. With in situ X-ray diffraction, crystalline phases can be identified and monitored in real time. For different (CH3NH3)I-to-PbCl2 flux ratios, two distinct (CH3NH3)Pb(IxCl(1-x))3 phases with high (x > 0.95) and with lower (x < 0.5) iodine content as well as a broad miscibility gap in-between were found. During post deposition annealing we observe recrystallization and preferential orientation effects and finally the decomposition of the perovskite film to PbI2 at temperatures above 200 °C.