He Jiang, Zhang Jiyao, Zhang Yong, Xu Jiamin, Liang Zheng, Zhu Peide, Peng Wenbo, Qu Geping, Pan Xu, Wang Xingzhu, Xu Baomin
Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, China.
Key Laboratory of Photovoltaic and Energy Conservation Material, Institute of Solid-State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, China.
Angew Chem Int Ed Engl. 2025 Feb 10;64(7):e202419957. doi: 10.1002/anie.202419957. Epub 2025 Jan 14.
Tin dioxide (SnO) stands as a promising material for the electron transport layer (ETL) in perovskite solar cells (PSCs) attributed to its superlative optoelectronic properties. The attainment of superior power conversion efficiency hinges critically on the preparation of high-quality SnO thin films. However, conventional nanoparticle SnO colloids often suffer from inherent issues such as numerous oxygen vacancy defects and film non-uniformity. In this study, we report a strategy to homogenize SnO with reduced defects for high-performance PSCs. The commercial SnO colloid is modulated with bisphenol S (BPS) crosslinking to achieve a better annealing intermediate state. The phenolic hydroxyl groups on BPS bond with the hydroxyl groups on the SnO surface, passivating defects as well as promoting superb regularity of the films by forming a network of the SnO nanoparticles. Additionally, the sulfone groups on BPS coordinate with Pb, regulating the crystallization of PbI and FAPbI, which leads to better interface contact at the buried interface. The FAPbI perovskite solar cells based on BPS-crosslinked SnO layers achieved a champion efficiency of 24.87 % and retained 95 % of their initial PCE after 1000 hours of continuous light soaking under N atmosphere.
二氧化锡（SnO）因其卓越的光电性能，成为钙钛矿太阳能电池（PSC）中电子传输层（ETL）的一种很有前景的材料。实现优异的功率转换效率关键取决于高质量SnO薄膜的制备。然而，传统的纳米颗粒SnO胶体常常存在诸如大量氧空位缺陷和薄膜不均匀性等固有问题。在本研究中，我们报道了一种使SnO均匀化且缺陷减少的策略，用于高性能PSC。用双酚S（BPS）交联对市售SnO胶体进行调制，以实现更好的退火中间状态。BPS上的酚羟基与SnO表面的羟基结合，钝化缺陷并通过形成SnO纳米颗粒网络促进薄膜的极佳规整性。此外，BPS上的砜基与Pb配位，调节PbI和FAPbI的结晶，这导致在掩埋界面处有更好的界面接触。基于BPS交联SnO层的FAPbI钙钛矿太阳能电池实现了24.87%的最高效率，并且在N气氛下连续光照浸泡1000小时后仍保留其初始光电转换效率（PCE）的95%。
