Structural investigation of co-evaporated methyl ammonium lead halide perovskite films during growth and thermal decomposition using different PbX2 (X = I, Cl) precursors
Structural investigation of co-evaporated methyl ammonium lead halide perovskite films during growth and thermal decomposition using different PbX2 (X = I, Cl) precursors
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DOI：
10.1039/c5ta04944j
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发表时间：
2015-01-01
影响因子：
11.9
通讯作者：
Pistor, Paul
中科院分区：
文献类型：
--
作者：
Borchert, Juliane;Boht, Heidi;Pistor, Paul
虽然钙钛矿太阳能电池的器件开发进展迅速，但薄膜形成的细节和工艺参数的相互作用，沉积相的结构和组成特性及其稳定性仍存在争议。在这里，我们提出了一个详细的结构分析的甲基铵卤化铅（I，Cl）薄膜的原位X射线衍射在其生长和热重结晶到其分解。将通过共蒸发MAI和PbI 2生长的MAPbI（3）膜与通过使用MAI和PbCl 2前体的蒸发途径得到的MAPbI（3）（Cl）膜进行比较。两种路线之间观察到的主要差异是在室温下不同的晶体结构和不同的有限工艺窗口，但相似的整体生长，再结晶和分解特征。纯MAPbI（3）的择优取向取决于所应用的摩尔前体通量比，并且还可以通过热退火进行修改。
While the progress in device development of perovskite solar cells is rapidly evolving, details of the film formation and the interplay of processing parameters, structural and compositional properties of deposited phases and their stability are still under dispute. Here we present a detailed structural analysis of methylammonium lead halide (I, Cl) films by in situ X-ray diffraction during their growth and thermal recrystallization up to their decomposition. MAPbI(3) films grown by co-evaporating MAI and PbI2 are compared to MAPbI(3)(Cl) films derived from an evaporation route using MAI and PbCl2 precursors. The main differences observed between the two routes are varying crystal structures at room temperature and differently limited process windows, but similar overall growth, recrystallization and decomposition features. The preferential orientation of the pure MAPbI(3) is shown to depend on the applied molar precursor flux ratio and can additionally be modified by thermal annealing.