美国西北大学Edward H. Sargent团队报道了双分子钝化界面使倒置钙钛矿太阳能电池高效稳定。相关研究成果发表在2023年11月17日出版的《科学》。

与n-i-p结构相比，倒置（p-i-n）钙钛矿太阳能电池（PSCs）有望提高运行稳定性，但由于非辐射复合损失，特别是在钙钛矿/C60界面，这些光伏电池通常表现出较低的功率转换效率（PCE）。

研究人员使用两种类型的功能分子钝化了表面缺陷，并使少数载流子能够从界面反射到本体中。使用硫修饰的甲硫基分子通过强配位和氢键钝化表面缺陷并抑制复合，同时使用二铵分子排斥少数载流子并减少通过场效应钝化实现的接触诱导的界面复合。

这种方法使载流子寿命延长了五倍，光致发光量子产率损失增加了三分之一，并使倒置PSCs在环境空气中65°C下稳定运行2000小时，获得了25.1%的准稳态PCE。研究人员还制造了具有28.1%PCE的单片全钙钛矿串联太阳能电池。

附：英文原文

Title: Bimolecularly passivated interface enables efficient and stable inverted perovskite solar cells

Author: Cheng Liu, Yi Yang, Hao Chen, Jian Xu, Ao Liu, Abdulaziz S. R. Bati, Huihui Zhu, Luke Grater, Shreyash Sudhakar Hadke, Chuying Huang, Vinod K. Sangwan, Tong Cai, Donghoon Shin, Lin X. Chen, Mark C. Hersam, Chad A. Mirkin, Bin Chen, Mercouri G. Kanatzidis, Edward H. Sargent

Issue&Volume: 2023-11-17

Abstract: Compared with the n-i-p structure, inverted (p-i-n) perovskite solar cells (PSCs) promise increased operating stability, but these photovoltaic cells often exhibit lower power conversion efficiencies (PCEs) because of nonradiative recombination losses, particularly at the perovskite/C60 interface. We passivated surface defects and enabled reflection of minority carriers from the interface into the bulk using two types of functional molecules. We used sulfur-modified methylthio molecules to passivate surface defects and suppress recombination through strong coordination and hydrogen bonding, along with diammonium molecules to repel minority carriers and reduce contact-induced interface recombination achieved through field-effect passivation. This approach led to a fivefold longer carrier lifetime and one-third the photoluminescence quantum yield loss and enabled a certified quasi-steady-state PCE of 25.1% for inverted PSCs with stable operation at 65°C for >2000 hours in ambient air. We also fabricated monolithic all-perovskite tandem solar cells with 28.1% PCE.

DOI: adk1633

Source: https://www.science.org/doi/10.1126/science.adk1633