近日，南方科技大学教授丘龙斌及其小组的最新研究提出了1.85eV宽禁带钙钛矿的结晶热力学调控及高效稳定的钙钛矿-有机串联光伏。这一研究成果发表在2025年2月10日出版的国际学术期刊《德国应用化学》上。

研究人员引入了一种二铵盐作为添加剂来调节钙钛矿薄膜的均匀性和结晶性，消除了1.85eV钙钛矿定向结晶的低维中间相，从而获得了高效的宽禁带钙钛矿太阳能电池，其开路电压（VOC）为1.379V，在照明1200小时后，其工作稳定性仍保持在初始效率的85%。钙钛矿-有机TSCs的冠军功率转换效率为24.03%，VOC高达2.108V，是钙钛矿-有机TSCs中VOC最高的产品之一。

研究人员表示，具有可调节带隙的宽带隙钙钛矿可以与有机太阳能电池集成形成串联太阳能电池（tsc），从而超越Shockley-Queisser极限。然而，增加Br含量使带隙高于1.8eV会使结晶变得复杂，导致薄膜质量下降，中间相的演变难以控制，从而导致缺陷。表面钝化改善了晶化，但难以缓和体相的不均匀分布和缺陷。

附：英文原文

Title: Crystallization Thermodynamics Regulation of 1.85 eV Wide-Bandgap Perovskite for Efficient and Stable Perovskite-Organic Tandem Photovoltaics

Author: Guanshui Xie, Huan Li, Jun Fang, Xin Wang, Haichen Peng, Dongxu Lin, Nuanshan Huang, Lin Gan, Wenjia Li, Ruixuan Jiang, Tongle Bu, Fuzhi Huang, Sisi He, Longbin Qiu

Issue&Volume: 2025-02-10

Abstract: Wide-bandgap perovskite with adjustable bandgaps can be integrated with organic solar cells to form tandem solar cells (TSCs), thereby surpassing the Shockley-Queisser limit.     However, increasing Br content to elevate the bandgap above 1.8 eV complicates crystallization, leading to inferior film quality and defects due to the unmanageable evolution of intermediate phases. Surface passivation improves crystallization but hard to moderate the inhomogeneous component distributions and defects in the bulk phase. Here, we introduce a diammonium salt as an additive to regulate the homogeneity and crystallization of perovskite film, eliminating the low-dimensional intermediate phase for orientated crystallization of 1.85 eV perovskite, resulting in efficient wide-bandgap perovskite solar cells with an impressive open-circuit voltage (VOC) of 1.379 V and operational stability remaining 85% of their initial efficiency after illumination for 1200 h. Furthermore, perovskite-organic TSCs achieve a champion power conversion efficiency of 24.03% and a high VOC of 2.108 V, one of the highest VOC for perovskite-organic TSCs.

DOI: 10.1002/anie.202501764

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202501764