近日，电子科技大学贾春阳团队研究了钙钛矿/硅串联太阳能电池稳定运行的交联分子接触。相关论文于2025年11月20日发表在《科学》杂志上。

单片钙钛矿/硅串联太阳能电池超越了单结太阳能电池的功率转换效率极限，但在运行稳定性方面存在挑战。

研究组确定填充因子减少是最先进串联架构中的一种关键性能损失模式。他们发现，广泛使用的空穴选择性分子接触可提高串联电池的性能，但会经历热降解，从而破坏电荷传输。在高温下，由于热致失序，传统单体接触的电阻增加了约六倍。

为了稳定界面结构，研究组引入了基于席夫碱键的原位合成交联分子接触。一平方厘米钙钛矿/硅串联太阳能电池的功率转换效率超过34%（经认证为33.61%），三个独立器件在65℃、AM1.5G照明、最大功率点运行约1200小时后，仍可保持初始性能的96.2±1.7%。

附：英文原文

Title: A cross-linked molecular contact for stable operation of perovskite/silicon tandem solar cells

Author: Boxue Zhang, Junsheng Luo, Haomiao Yin, Qing Li, Siqi Sun, Ningxuan Zhang, Nan Gan, Muhammad Azam, Tae Wan Park, Zhongquan Wan, Chunyang Jia, Mingyang Wei, So Min Park

Issue&Volume: 2025-11-20

Abstract: Monolithic perovskite/silicon tandem solar cells surpass the power-conversion efficiency limits of single-junction solar cells but face challenges in operational stability. We identified fill factor diminution as a key performance-loss mode in the state-of-the-art tandem architecture. We reveal that widely used hole-selective molecular contacts, which enhance tandem cell performance, undergo thermal degradation that undermines charge transport. At elevated temperatures, the resistance of conventional monomeric contacts increases by about sixfold because of thermal-induced disorder. To stabilize interfacial structures, we introduce in situ synthesized cross-linked molecular contacts based on Schiff base linkages. One-square-centimeter perovskite/silicon tandem solar cells achieved power-conversion efficiencies exceeding 34% (33.61% certified), and three independent devices retained 96.2 ± 1.7% of their initial performance after about 1200-hour maximum power point operation under AM1.5G illumination at 65°C.

DOI: ady6874

Source: https://www.science.org/doi/10.1126/science.ady6874