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<p>Constructing ideal P-i-N-like network morphology and extending exciton diffusion length (<i>L</i><sub>D</sub>) are considered bottleneck factors to further improve the power conversion efficiency (PCE) of organic photovoltaics (OPVs). However, simultaneous optimizations of the vertical phase separation morphology and <i>L</i><sub>D</sub> have rarely been reported. In this work, we apply a gradient thermal-annealing strategy to efficiently regulate the molecular stacking orientation and crystallinity of the polymer donor. The ordered molecular stacking significantly improves the exciton diffusion paths and enlarges the <i>L</i><sub>D</sub> from 19.47 nm (PM6-control) to 24.96 nm (PM6-target), enabling efficient exciton dissociation and charge transport. Moreover, the optimized crystallinity behavior inhibited PM6 film erosion from the upper acceptor solution. It ensured controlled donor-acceptor interpenetration, forming the desired pseudo planar heterojunction (PPHJ) structure. Eventually, benefiting from the ideal vertical morphology and the prolonged <i>L</i><sub>D</sub>, the printing PPHJ (target) device achieves an outstanding PCE of 18.20% with suppressed non-radiative recombination losses (0.212 eV) and enhanced fill factor (78.2%), which is one of the top values for the reported eco-friendly printing binary OPVs. This study demonstrates a simple but feasible method to further improve the performance of polymer solar cells.</p>

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Controllably manufactured pseudo planar heterojunction enables efficient printable organic photovoltaic via gradient thermal-annealing strategy

  • 期刊论文

  • 发表日期：

    2025年5月29日

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  • Bending Zhang,
  • Weishuo Chen,
  • Jiayou Zhang,
  • Houdong Mao,
  • Xiaoyu Gu,
  • Zhao Qin,
  • Dou Luo,
  • Lifu Zhang,
  • Yiwang Chen

摘要

Constructing ideal P-i-N-like network morphology and extending exciton diffusion length (LD) are considered bottleneck factors to further improve the power conversion efficiency (PCE) of organic photovoltaics (OPVs). However, simultaneous optimizations of the vertical phase separation morphology and LD have rarely been reported. In this work, we apply a gradient thermal-annealing strategy to efficiently regulate the molecular stacking orientation and crystallinity of the polymer donor. The ordered molecular stacking significantly improves the exciton diffusion paths and enlarges the LD from 19.47 nm (PM6-control) to 24.96 nm (PM6-target), enabling efficient exciton dissociation and charge transport. Moreover, the optimized crystallinity behavior inhibited PM6 film erosion from the upper acceptor solution. It ensured controlled donor-acceptor interpenetration, forming the desired pseudo planar heterojunction (PPHJ) structure. Eventually, benefiting from the ideal vertical morphology and the prolonged LD, the printing PPHJ (target) device achieves an outstanding PCE of 18.20% with suppressed non-radiative recombination losses (0.212 eV) and enhanced fill factor (78.2%), which is one of the top values for the reported eco-friendly printing binary OPVs. This study demonstrates a simple but feasible method to further improve the performance of polymer solar cells.