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<p>Limited heat dissipation at perovskite and adjacent-layer interfaces causes local overheating and accelerates degradation in perovskite photovoltaics. Conventional thermal interface materials mitigate heat buildup but often hinder interfacial charge transport. Here we prepare a solution-processable alkynyl-functionalized porphyrin conjugated polymer that offers high charge mobility and efficient heat conduction. Terahertz spectroscopy yields a carrier mobility of 0.76 cm<sup>2</sup> V<sup>−1</sup> s<sup>−1</sup>, and laser flash analysis shows a thermal conductivity of 0.97 W m<sup>−1</sup> K<sup>−1</sup>. When incorporated as an interfacial layer between the perovskite and the hole-transport material, the polymer’s favourable charge-transport property enables a 23.04% certified power conversion efficiency in 64.8-cm<sup>2</sup>-aperture minimodules. Improved interfacial heat conduction lowers the operating temperature under AM 1.5G illumination from 44.0 °C to 40.4 °C, enhancing stability with &gt;95% efficiency retention in unencapsulated devices after 1,000 hours of continuous operation. This work establishes a solution-processable, high-mobility thermal interface material for efficient interfacial thermal management in optoelectronic devices.</p><p></p>

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A synthetically tailored conjugated polymer for thermal and charge management in perovskite interfaces

  • 期刊论文

  • 发表日期：

    2026年4月2日

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  • Sibei Mai,
  • Zhen-Yang Suo,
  • Chen Lu,
  • Guo-Bin Xiao,
  • Xijiao Mu,
  • Fan Yang,
  • Yu Tang,
  • Jing Cao

摘要

Limited heat dissipation at perovskite and adjacent-layer interfaces causes local overheating and accelerates degradation in perovskite photovoltaics. Conventional thermal interface materials mitigate heat buildup but often hinder interfacial charge transport. Here we prepare a solution-processable alkynyl-functionalized porphyrin conjugated polymer that offers high charge mobility and efficient heat conduction. Terahertz spectroscopy yields a carrier mobility of 0.76 cm2 V−1 s−1, and laser flash analysis shows a thermal conductivity of 0.97 W m−1 K−1. When incorporated as an interfacial layer between the perovskite and the hole-transport material, the polymer’s favourable charge-transport property enables a 23.04% certified power conversion efficiency in 64.8-cm2-aperture minimodules. Improved interfacial heat conduction lowers the operating temperature under AM 1.5G illumination from 44.0 °C to 40.4 °C, enhancing stability with >95% efficiency retention in unencapsulated devices after 1,000 hours of continuous operation. This work establishes a solution-processable, high-mobility thermal interface material for efficient interfacial thermal management in optoelectronic devices.