近日，华中科技大学李忠安团队实现了高效钙钛矿太阳能电池通过抑制分子间聚集在孔选择接触。相关论文于2025年7月21日发表在《自然—光子学》杂志上。
孔选择接触对于提高钙钛矿太阳能电池的性能至关重要，但其优化仍然面临障碍。例如，在溶液处理过程中，实现均匀沉积和防止小分子材料聚集颇具挑战性的，这会对电池的效率、可重复性和稳定性产生负面影响。
研究组与钙钛矿膜共沉积了一种新的p型小分子（D4PA）。D4PA中的分子内C-C耦合能够与钙钛矿和衬底进行强多锚定相互作用，增强界面电荷传输并抑制钙钛矿层内缺陷的形成。C-C耦合还引入了位阻，产生扭曲的分子构象，有效地防止了分子聚集，延长了溶液的可加工性，提高了设备的可重复性。
该器件在小面积器件中具有26.72%的认证功率转换效率和26.14%的认证最大功率点跟踪效率。在有效面积为10.86 cm2的微型模块中，功率转换效率为23.37%，认证最大功率点跟踪效率为22.66%。在最大功率点连续运行2500小时后，这些设备保持了超过97.2%的初始效率。
附：英文原文
Title: High-efficiency perovskite solar cells enabled by suppressing intermolecular aggregation in hole-selective contacts
Author: Gao, Danpeng, Li, Bo, Sun, Xianglang, Liu, Qi, Zhang, Chunlei, Qian, Liangchen, Yu, Zexin, Li, Xintong, Wu, Xin, Liu, Baoze, Wang, Ning, Vanin, Francesco, Xia, Xinxin, Gong, Jie, Li, Nan, Zeng, Xiao Cheng, Li, Zhongan, Zhu, Zonglong
Issue&Volume: 2025-07-21
Abstract: Hole-selective contacts are crucial for improving the performance of perovskite solar cells, but their optimization still faces obstacles. For example, it is challenging to achieve uniform deposition and prevent aggregation of small-molecule materials during solution processing, negatively impacting cell efficiency, reproducibility and stability. Here we co-deposit a new p-type small molecule (D4PA) with the perovskite film. The intramolecular C–C coupling in D4PA enables strong multi-anchoring interactions with both the perovskite and substrate, enhancing interfacial charge transport and inhibiting defect formation within the perovskite layer. The C–C coupling also introduces steric hindrance, creating twisted molecular conformations that effectively prevent molecular aggregation, extend the solution processability and increase device reproducibility. Our devices exhibit a certified power conversion efficiency of 26.72% and a certified maximum power point tracking efficiency of 26.14% in small-area devices. A power conversion efficiency of 23.37% and a certified maximum power point tracking efficiency of 22.66% are achieved in a mini-module with an effective area of 10.86cm2. The devices maintain over 97.2% of their initial efficiency after 2,500h of continuous operation at their maximum power point.
DOI: 10.1038/s41566-025-01725-x
Source: https://www.nature.com/articles/s41566-025-01725-x