论文标题

在电偏置下对杂化钙钛矿太阳能电池的实时非晶化成像

Imaging real-time amorphization of hybrid perovskite solar cells under electrical biasing

论文作者

Kim, Min-cheol, Ahn, Namyoung, Cheng, Diyi, Xu, Mingjie, Pan, Xiaoqing, Kim, Suk Jun, Luo, Yanqi, Fenning, David P., Tan, Darren H. S., Zhang, Minghao, Ham, So-Yeon, Jeong, Kiwan, Choi, Mansoo, Meng, Ying Shirley

论文摘要

近年来,由于其世界纪录的光伏性能,钙钛矿太阳能电池引起了很多关注。尽管它在串联应用和灵活的设备中有希望使用,但其实用性仍然受到离子迁移和缺陷形成引起的结构不稳定的限制。虽然通常可以理解,离子不稳定性是降解的主要原因,但仍缺乏直接证据表明在原子规模上结构转化。这样的理解对于评估和限定点相对于外部扰动(如照明或随着时间的电动偏见)而引起的这种不稳定性至关重要,从而使研究人员能够制定有效的策略来减轻它们。在这里,我们设计了一种原位TEM设置,以实现双阳离子混合钙钛矿材料在1 V处的电偏置材料的实时观察。发现沿着(001)和(002)平面发生非变形化,这代表了对含量依赖性依赖性的perofs perofscite perofscite perofscite perofsmerphization。为了扭转降解,将样品以50 oC加热,并被发现重结晶,有效地恢复了其性能损失。这项工作对于理解基本离子移民现象并应对钙钛矿光电子的不稳定挑战至关重要。

Perovskite solar cells have drawn much attention in recent years, owing to its world-record setting photovoltaic performances. Despite its promising use in tandem applications and flexible devices, its practicality is still limited by its structural instability often arising from ion migration and defect formation. While it is generally understood that ion instability is a primary cause for degradation, there is still a lack of direct evidence of structural transformation at the atomistic scale. Such an understanding is crucial to evaluate and pin-point how such instabilities are induced relative to external perturbations such as illumination or electrical bias with time, allowing researchers to devise effective strategies to mitigate them. Here, we designed an in-situ TEM setup to enable real-time observation of amorphization in double cation mixed perovskite materials under electrical biasing at 1 V. It is found that amorphization occurs along the (001) and (002) planes, which represents the observation of in-situ facet-dependent amorphization of a perovskite crystal. To reverse the degradation, the samples were heated at 50 oC and was found to recrystallize, effectively regaining its performance losses. This work is vital toward understanding fundamental ion-migration phenomena and address instability challenges of perovskite optoelectronics.

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