沙特阿卜杜拉国王科技大学 Liu Jiang团队报道了通过MgFx的接触置换，实现高效稳定的钙钛矿硅串联太阳能电池。相关研究成果发表在2022年6月23日出版的《科学》。

反极性钙钛矿太阳能电池（p-i-n）的性能仍然受到其电子提取界面复合的限制，这也降低了p-i-n钙钛矿硅串联太阳能电池的功率转换效率（PCE）。研究人员通过热蒸发在钙钛矿/C60界面上形成一层约1 nm厚的MgFx中间层，有利于调节钙钛矿层的表面能，促进有效的电子提取，并将C60从钙钛矿表面置换，以减轻非辐射复合。

这些效应使~1 cm²单片钙钛矿硅串联太阳能电池的Voc达到1.92伏，填充系数提高80.7%，稳定PCE达到29.3%。在湿热试验（85℃和85%相对湿度）超过1000小时后，串联保持了约95%的初始性能。

附：英文原文

Title: Efficient and stable perovskite-silicon tandem solar cells through contact displacement by MgF x

Author: Jiang Liu, Michele De Bastiani, Erkan Aydin, George T. Harrison, Yajun Gao, Rakesh R. Pradhan, Mathan K. Eswaran, Mukunda Mandal, Wenbo Yan, Akmaral Seitkhan, Maxime Babics, Anand S. Subbiah, Esma Ugur, Fuzong Xu, Lujia Xu, Mingcong Wang, Atteq ur Rehman, Arsalan Razzaq, Jingxuan Kang, Randi Azmi, Ahmed Ali Said, Furkan H. Isikgor, Thomas G. Allen, Denis Andrienko, Udo Schwingenschlgl, Frédéric Laquai, Stefaan De Wolf

Issue&Volume: 2022-06-23

Abstract: The performance of perovskite solar cells with inverted polarity (p-i-n) is still limited by recombination at their electron extraction interface, which also lowers the power conversion efficiency (PCE) of p-i-n perovskite-silicon tandem solar cells. A ~1 nm thick MgFx interlayer at the perovskite/C60 interface through thermal evaporation favorably adjusts the surface energy of the perovskite layer, facilitating efficient electron extraction, and displaces C60 from the perovskite surface to mitigate nonradiative recombination. These effects enable a champion Voc of 1.92 volts, an improved fill factor of 80.7%, and an independently certified stabilized PCE of 29.3% for a ~1 cm2 monolithic perovskite-silicon tandem solar cell. The tandem retained ~95% of its initial performance following damp-heat testing (85 Celsius at 85% relative humidity) for > 1000 hours.

DOI: abn8910

Source: https://www.science.org/doi/10.1126/science.abn8910