苏州大学李永舫团队报道了银纳米线电极上的智能靶向层实现无ITO传统柔性有机太阳能电池的效率突破。相关研究成果于2025年2月6日发表在《德国应用化学》。

银纳米线（AgNW）电极以其固有的柔性和可调的光电性能而闻名，在柔性有机太阳能电池（OSCs）中的应用引起了相当大的关注。然而，在传统的OSCs中，它们的低功函数（WF）会导致与经典水性空穴传输层（HTL）的能级失配，而它们较差的亲水性阻碍了优化HTL形态和结晶度的形成，对它们集成到高性能OSCs中提出了挑战。

为了解决这些问题，一端有巯基、另一端有强吸电子亲水官能团的功能靶向分子被精确地设计成包裹在AgNW电极周围。巯基有助于在室温下通过稳定的S-Ag化学键在AgNW电极上形成坚固的自组装分子（SAM）。强吸电子基团产生显著的分子和界面偶极子，有效地提高了AgNW电极的WF。值得注意的是，亲水基团不仅提高了电极的润湿性，还促进了与HTL的强氢键相互作用，从而显著改善了HTL的形态和结晶度。这种精密封装策略能够制造高效的传统柔性OSCs，基于无ITO透明电极的柔性OSCs的功率转换效率达到创纪录的18.84%（认证为18.56%）。

附：英文原文

Title: Smart Targeting Layer on Silver Nanowire Electrodes Achieving Efficiency Breakthroughs in ITO-Free Conventional Flexible Organic Solar Cells

Author: Jinfeng Xia, Juan Zhu, Haiyang Chen, Guang Zeng, Juanyong Wan, Ben Zhang, Seunglok Lee, Jiacheng Xu, Jianlei Cao, Xiaoxiao Wu, Junyuan Ding, Leishuo Yang, Weijie Chen, Changduk Yang, Yaowen Li, Yongfang Li

Issue&Volume: 2025-02-06

Abstract: Silver nanowire (AgNW) electrodes, known for their intrinsic flexibility and tunable optoelectronic properties, have garnered considerable attention for use in flexible organic solar cells (OSCs). However, in conventional OSCs, their low work function (WF) causes energy-level mismatches with classic aqueous hole transport layers (HTLs), while their poor hydrophilicity hinders the formation of optimized HTL morphology and crystallinity, posing challenges to their integration into high-performance OSCs. To address these issues, functionally targeted molecules with a thiol group at one end and strong electron-withdrawing, hydrophilic functional groups at the other are precisely engineered to wrap around the AgNW electrodes. The thiol group facilitates the formation of robust self-assembled molecules (SAMs) on the AgNW electrodes through stable S-Ag chemical bonds at room temperature. The strong electron-withdrawing groups generate notable molecular and interfacial dipoles that effectively raise the WF of AgNW electrodes. Notably, the hydrophilic groups not only improve electrode wettability but also promote strong hydrogen bonding interactions with HTL, leading to substantial improvements in the morphology and crystallinity of the HTL. This precision wrapping strategy enables the fabrication of high-efficient conventional flexible OSCs, achieving a record power conversion efficiency of 18.84% (certified at 18.56%) for flexible OSCs based on ITO-free transparent electrodes.

DOI: 10.1002/anie.202501270

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202501270