Grain Growth of MAPbI3 via Diethylammonium Bromide Induced Grain Mergence,ACS Applied Materials & Interfaces

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Grain Growth of MAPbI3 via Diethylammonium Bromide Induced Grain Mergence
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2020-03-27 , DOI: 10.1021/acsami.0c01672
Xin Huang ₁ , Wentao Bi ₁ , Pengcheng Jia ₁ , Qiuhong Cui ₁ , Yufeng Hu ₁ , Zhidong Lou ₁ , Yanbing Hou ₁ , Feng Teng ₁

Affiliation

Various additives are used to improve the film morphology, crystal quality, and grain size for the sake of enhancing the performance of three-dimensional perovskite solar cells. Although significant enhancement in the performance of devices has been made due to the introduction of additives, an in-depth understanding of the additive-related crystallization kinetics and the growth mechanism is still lacking. Here, the grain growth mechanism of diethylammonium bromide (DABr)-doped MAPbI₃ is investigated using in situ dynamic microscopy techniques. The results reveal that the alkyl chains of DABr restrain the growth of grains of MAPbI₃ during spin-coating, and DABr-induced grain mergence during the annealing process, achieving large grains on the micrometer scale. Meanwhile, the crystallization of MAPbI₃ with DABr is significantly improved and the number of defects is reduced. The solar cell with optimized DABr doping MAPbI₃ as the active layer presents a higher power conversion efficiency (PCE) of 19.58% with a fill factor of 79.81%.

中文翻译：

通过二乙基溴化铵诱导的MAPbI _3的晶粒长大

为了增强三维钙钛矿太阳能电池的性能，使用各种添加剂来改善膜的形态，晶体质量和晶粒尺寸。尽管由于添加了添加剂，器件的性能有了显着提高，但仍缺乏对与添加剂有关的结晶动力学和生长机理的深入了解。在这里，使用原位动态显微镜技术研究了掺杂二乙基溴化铵（DABr）的MAPbI ₃的晶粒生长机理。结果表明，DABr的烷基链抑制了MAPbI ₃晶粒的生长。在旋涂过程中，以及在退火过程中DABr引起的晶粒合并，在微米级上获得大晶粒。同时，用DABr显着改善了MAPbI ₃的结晶，减少了缺陷数量。具有优化的DABr掺杂MAPbI ₃作为有源层的太阳能电池具有19.58％的较高功率转换效率（PCE），填充因子为79.81％。

更新日期：2020-03-27

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