近日，西安交通大学梁超团队研究了具有低异构化障碍的钙钛矿太阳能电池的轴向手性分子接触。该项研究成果发表在2026年1月19日出版的《自然—光子学》杂志上。
分子选择性接触材料对提升钙钛矿太阳能电池的功率转换效率具有重要前景。尽管高共轭刚性的空穴选择性接触材料通过有序的π-π堆叠可促进载流子高效传输，但实现这种堆叠的强分子间相互作用也会引发分子聚集，从而影响接触层的均匀性并损害器件的工作稳定性。
研究组报道了一种具有轴向手性框架的分子接触材料，其通过两个π体系的非共面排布与受限的N-C键旋转实现。该分子具有极低的异构化能垒（4.37千卡每摩尔），能有效抑制分子聚集并促进均匀堆叠，从而形成均质稳定的界面。采用该分子接触材料的器件在0.08平方厘米孔径面积下实现了26.91%的功率转换效率（认证效率26.44%），在69平方厘米组件面积下效率达到22.14%。小面积器件在65摄氏度、持续1倍光强最大功率点运行的条件下，实现了超过2000小时的T98寿命。
附：英文原文
Title: Axially chiral molecular contacts with low isomerization barriers for perovskite solar cells
Author: Yang, Wenhan, Guan, Xin, Cai, Qingbin, Lin, Yuexin, Zhang, Zuhong, Zhao, Jinbo, Guo, Jia, Zhu, Annan, Du, Fenqi, Zhu, Wenjing, Liu, Jin, Jiang, Sen, Zhang, Nan, Liu, Xiaolong, Zhang, Lei, Wu, Youshen, Yang, Shengchun, Li, Meng, Liang, Chao
Issue&Volume: 2026-01-19
Abstract: Molecular selective contacts are promising for increasing the power conversion efficiency of perovskite solar cells. Although highly conjugated and rigid hole-selective contacts with ordered π–π stacking facilitate efficient carrier transport, the strong intermolecular interactions responsible for such stacking also trigger molecular aggregation, compromising the homogeneity of the contact and, therefore, operational stability. Here we report a molecular contact featuring an axially chiral framework through a non-coplanar arrangement of the two π-systems and restricted N–C rotation. With an extremely low isomerization barrier of 4.37kcalmol1, the molecule exhibits suppressed aggregation and promotes uniform packing, yielding a homogeneous and stable interface. Devices incorporating this molecular contact delivered a power conversion efficiency of 26.91% (certified, 26.44%) and 22.14% for aperture areas of 0.08cm2 and 69cm2 (modules), respectively. The small-area devices achieve a T98 lifetime of over 2,000h under continuous 1-sun maximum power point operation at 65°C.
DOI: 10.1038/s41566-025-01817-8
Source: https://www.nature.com/articles/s41566-025-01817-8