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<p>The fabrication of thick active layers in organic solar cells (OSCs) is essential for roll-to-roll commercial production. However, thicker layers often lead to a notable decline in device performance, mainly due to the limited exciton diffusion length (<i>L</i><sub>D</sub>). Herein, we fabricated efficient thick-film planar heterojunction (PHJ) OSCs via the assistance of a new volatile solid additive (VSA) benzothieno[1,2-b]furan (TBF), featuring with atomically symmetric breaking skeleton. The asymmetric VSA treatment not only constructed a long-range ordered yet moderately loose molecular packing, but also induced an increased dielectric screening effect in the L8-BO-X layer through enhancing dipole interactions and mitigating exciton binding energy, simultaneously yielding a substantially higher photoluminescence quantum yield (PLQY) and effectively suppressing exciton-vibration coupling than the symmetric VSA counterparts benzo[1,2-b:4,5-b′]dithiophene (BDT) and benzo[1,2-b:4,5-b]difuran (BDF). Consequently, the TBF-treated film exhibits an extended <i>L</i><sub>D</sub> &gt;40 nm, favoring exciton dissociation, and charge generation/transport, as well as reducing energy disorder. Remarkably, TBF-based empowered devices achieve high PCEs of 20.4%, 18.5%, and 16.5% at 110-, 300-, and 500-nm thicknesses, respectively, demonstrating exceptional thickness tolerance. This atomically symmetric breaking VSA strategy provides a promising strategy for extending the <i>L</i><sub>D</sub> to achieve thick-film OSCs with prominent performance.</p>

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Benzothieno[1,2-b]furan: an atomically symmetric-breaking volatile solid additive for high-performance thick-film planar heterojunction organic solar cells

  • 期刊论文

  • 发表日期：

    2026年1月4日

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  • Tianyu Hu,
  • Liangliang Chen,
  • Wentao Miao,
  • Chao Li,
  • Jiali Song,
  • Yuchen Liao,
  • Junhong Liang,
  • Jingyi Xiong,
  • Xunchang Wang,
  • Yanming Sun,
  • He Yan,
  • Renqiang Yang

摘要

The fabrication of thick active layers in organic solar cells (OSCs) is essential for roll-to-roll commercial production. However, thicker layers often lead to a notable decline in device performance, mainly due to the limited exciton diffusion length (LD). Herein, we fabricated efficient thick-film planar heterojunction (PHJ) OSCs via the assistance of a new volatile solid additive (VSA) benzothieno[1,2-b]furan (TBF), featuring with atomically symmetric breaking skeleton. The asymmetric VSA treatment not only constructed a long-range ordered yet moderately loose molecular packing, but also induced an increased dielectric screening effect in the L8-BO-X layer through enhancing dipole interactions and mitigating exciton binding energy, simultaneously yielding a substantially higher photoluminescence quantum yield (PLQY) and effectively suppressing exciton-vibration coupling than the symmetric VSA counterparts benzo[1,2-b:4,5-b′]dithiophene (BDT) and benzo[1,2-b:4,5-b]difuran (BDF). Consequently, the TBF-treated film exhibits an extended LD >40 nm, favoring exciton dissociation, and charge generation/transport, as well as reducing energy disorder. Remarkably, TBF-based empowered devices achieve high PCEs of 20.4%, 18.5%, and 16.5% at 110-, 300-, and 500-nm thicknesses, respectively, demonstrating exceptional thickness tolerance. This atomically symmetric breaking VSA strategy provides a promising strategy for extending the LD to achieve thick-film OSCs with prominent performance.