Scholarlink

<p>Organic solar cells (OSCs) achieve 21% efficiency, yet non-radiative energy loss (<i>q</i>Δ<i>V</i><sub>nr</sub>) remains a critical barrier to further improve the open-circuit voltage (<i>V</i><sub>OC</sub>). This loss is primarily governed by the optoelectronic properties of interfacial CT states, yet the precise role of electron-phonon coupling (EPC) is not fully resolved. Through analysis of three all-polymer OSCs and four small molecule acceptor (SMA)-based OSCs, we identify two donor-acceptor (D-A) interfacial mixed phases that foster two distinct CT states, establishing efficient charge generation. These two phases emerge from amorphous D-A entanglement, termed as Entangled (E-) interface, and the penetration of acceptor quasi-aggregates into donor polymer matrix, termed as Penetrated (P-) interfaces. The P-interface exhibits inherently weaker EPC than that of E-interface since the suppressed intramolecular interaction. As the results, the P-interfaces, governing all-polymer OSCs, achieve a significant reduction of ~60 meV in <i>q</i>Δ<i>V</i><sub>nr</sub> compared to E-interface dominated SMA-based OSCs. The incorporation of PA into SMA system as guest component modulates the population of P-interface reducing the EPC and then enhancing <i>V</i><sub>OC</sub>. Overall, our work suggests that modulating the population of P-interfaces to suppress EPC is a viable strategy for reducing non-radiative voltage loss and overcoming the efficiency bottleneck of organic solar cells.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Suppressing electron-phonon coupling and energy loss in organic solar cells by modulating donor-acceptor penetrated-interface

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年1月26日

查看全文
  • Yongmin Luo,
  • Yulong Hai,
  • Yao Li,
  • Ruijie Ma,
  • Lunbi Wu,
  • Kezhou Fan,
  • Yi Chan,
  • Top Archie Dela Peña,
  • Fangliang Dong,
  • Ming Wang,
  • Yeng Ming Lam,
  • He Yan,
  • Kam Sing Wong,
  • Tao Jia,
  • Gang Li,
  • Jiaying Wu

摘要

Organic solar cells (OSCs) achieve 21% efficiency, yet non-radiative energy loss (qΔVnr) remains a critical barrier to further improve the open-circuit voltage (VOC). This loss is primarily governed by the optoelectronic properties of interfacial CT states, yet the precise role of electron-phonon coupling (EPC) is not fully resolved. Through analysis of three all-polymer OSCs and four small molecule acceptor (SMA)-based OSCs, we identify two donor-acceptor (D-A) interfacial mixed phases that foster two distinct CT states, establishing efficient charge generation. These two phases emerge from amorphous D-A entanglement, termed as Entangled (E-) interface, and the penetration of acceptor quasi-aggregates into donor polymer matrix, termed as Penetrated (P-) interfaces. The P-interface exhibits inherently weaker EPC than that of E-interface since the suppressed intramolecular interaction. As the results, the P-interfaces, governing all-polymer OSCs, achieve a significant reduction of ~60 meV in qΔVnr compared to E-interface dominated SMA-based OSCs. The incorporation of PA into SMA system as guest component modulates the population of P-interface reducing the EPC and then enhancing VOC. Overall, our work suggests that modulating the population of P-interfaces to suppress EPC is a viable strategy for reducing non-radiative voltage loss and overcoming the efficiency bottleneck of organic solar cells.