Liu Cheng, Yang Yi, Chen Hao, Xu Jian, Liu Ao, Bati Abdulaziz S R, Zhu Huihui, Grater Luke, Hadke Shreyash Sudhakar, Huang Chuying, Sangwan Vinod K, Cai Tong, Shin Donghoon, Chen Lin X, Hersam Mark C, Mirkin Chad A, Chen Bin, Kanatzidis Mercouri G, Sargent Edward H
Department of Chemistry, Northwestern University, Evanston, IL 60208, USA.
Department of Electrical and Computer Engineering, University of Toronto, Toronto, ON M5S 1A4, Canada.
Science. 2023 Nov 17;382(6672):810-815. doi: 10.1126/science.adk1633. Epub 2023 Nov 16.
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/C 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.
与n-i-p结构相比，倒置（p-i-n）钙钛矿太阳能电池（PSC）有望提高运行稳定性，但由于非辐射复合损失，这些光伏电池的功率转换效率（PCE）往往较低，尤其是在钙钛矿/C界面处。我们使用两种功能分子钝化表面缺陷，并实现少数载流子从界面反射回体相中。我们使用硫改性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，并通过场效应钝化减少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降低了三分之一，并使倒置PSC的认证准稳态PCE达到25.1%，在环境空气中于65°C下稳定运行超过2000小时。我们还制造了PCE为28.1%的单片全钙钛矿串联太阳能电池。
