Suppressing Vacancy Defects and Grain Boundaries via Ostwald Ripening for High-Performance and Stable Perovskite Solar Cells.,Advanced Materials

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Suppressing Vacancy Defects and Grain Boundaries via Ostwald Ripening for High-Performance and Stable Perovskite Solar Cells.
Advanced Materials ( IF 27.4 ) Pub Date : 2019-12-27 , DOI: 10.1002/adma.201904347
Yuqian Yang ₁ , Jihuai Wu ₁ , Xiaobing Wang ₁ , Qiyao Guo ₁ , Xuping Liu ₁ , Weihai Sun ₁ , Yuelin Wei ₁ , Yunfang Huang ₁ , Zhang Lan ₁ , Miaoliang Huang ₁ , Jianming Lin ₁ , Hongwei Chen ₁ , Zhanhua Wei ₁

Affiliation

As one kind of promising next-generation photovoltaic devices, perovskite solar cells (PVSCs) have experienced unprecedented rapid growth in device performance over the past few years. However, the practical applications of PVSCs require much improved device long-term stability and performance, and internal defects and external humidity sensitivity are two key limitation need to be overcome. Here, gadolinium fluoride (GdF3 ) is added into perovskite precursor as a redox shuttle and growth-assist; meanwhile, aminobutanol vapor is used for Ostwald ripening in the formation of the perovskite layer. Consequently, a high-quality perovskite film with large grain size and few grain boundaries is obtained, resulting in the reduction of trap state density and carrier recombination. As a result, a power conversion efficiency of 21.21% is achieved with superior stability and negligible hysteresis.

中文翻译：

通过奥斯特瓦尔德熟化抑制空缺缺陷和晶界，以实现高性能和稳定的钙钛矿太阳能电池。

作为一种有前途的下一代光伏器件，钙钛矿太阳能电池（PVSC）在过去几年中经历了前所未有的器件性能快速增长。但是，PVSC的实际应用需要大大改善的器件长期稳定性和性能，而内部缺陷和外部湿度敏感性是需要克服的两个关键限制。在这里，氟化g（GdF3）被添加到钙钛矿前体中，作为氧化还原穿梭和助长剂。同时，氨基丁醇蒸气用于钙钛矿层形成中的Ostwald熟化。因此，获得了具有大晶粒尺寸和很少晶界的高质量钙钛矿膜，导致陷阱态密度和载流子复合的降低。结果，功率转换效率为21。

更新日期：2020-02-18

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