Boosting performance of perovskite solar cells through a novel active passivation method
Boosting performance of perovskite solar cells through a novel active passivation method
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通过新型主动钝化方法提高钙钛矿太阳能电池的性能
DOI：
10.1039/c8ta05593a
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发表时间：
2018
影响因子：
11.9
通讯作者：
Lirong Zheng
中科院分区：
文献类型：
--
作者：
Pengfei Wang;Jiao Wang;Xin Zhang;Haoliang Wang;Xiaolei Cui;Sijian Yuan;Haizhou Lu;Li Tu;Yiqiang Zhan;Lirong Zheng
由于卤化钾能改善钙钛矿太阳能电池的性能，近年来引起了人们的广泛关注。在钙钛矿吸收剂中加入少量的卤化钾，可以在结晶度、光吸收和减少陷阱态方面提供优势。在这里，我们提出了一种氯化钾（KCl）预处理工艺来制备高效钙钛矿太阳能电池（PSCs）。通过简单的自旋镀膜方法在SnO2/MAPbI3−xClx界面上插入KCl层。在热退火过程中，钾离子（K+）和氯离子（Cl−）扩散到钙钛矿薄膜中。当K+和Cl−到达体缺陷时，它们的扩散将停止，从而产生主动钝化效应。结果表明，氯化钾的加入提高了钙钛矿薄膜的结晶度和光吸收率。PSCs的平均功率转换效率（PCE）从16.62%提高到17.81%，其中PCE最高达到19.44%。
Potassium halides have recently garnered much attention, due to their improvement of perovskite solar cell performance. A small amount of potassium halide incorporated in a perovskite absorber is able to provide advantages in terms of crystallinity, light absorption and trap state reduction. Here, we present a potassium chloride (KCl) pretreatment process to fabricate high-efficiency perovskite solar cells (PSCs). A KCl layer was inserted at the SnO2/MAPbI3−xClx interface via a simple spin coating method. It is observed that potassium cations (K+) and chloride anions (Cl−) diffused into the perovskite film during the thermal annealing process. The diffusion of K+ and Cl− will stop when they reach a bulk defect, resulting in an active passivation effect. It is verified that the incorporation of KCl enhances the crystal perfection and light absorption of the perovskite film. The average power conversion efficiency (PCE) of PSCs increases from 16.62% to 17.81%, with a leading PCE of 19.44%.