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<p>The inherently low thermal conductivity of conventional hole-transport layers (HTLs) in inverted perovskite solar cells (PSCs) introduces a substantial discrepancy in interlayer heat-transfer dynamics, leading to detrimental heat accumulation and nonradiative recombination. Herein, we develop a spinel-type semiconductor of CuBi<sub>2</sub>O<sub>4</sub>, and integrate it into a composite HTL architecture to regulate heat conduction for the first time. Leveraging enhanced phonon group velocities, the CuBi<sub>2</sub>O<sub>4</sub>-based composite HTL achieves exceptional thermal compatibility with the perovskite absorber, demonstrating enhanced heat conduction and optimal thermal-expansion coefficient alignment. These synergistic effects significantly delay hot-carrier relaxation and reduce excess energy dissipation by approximately 10-fold. Consequently, we obtain high-quality perovskite films with ordered orientation and released residual strain, yielding an impressive power conversion efficiency (PCE) of 27.18% (certified 26.83%). Remarkably, these phonon-engineered devices maintain 90.1%, 82.3%, 85.6% and 93.7% of their initial PCEs under ISOS-D-2Ⅰ, ISOS-D-3, ISOS-T-1 and ISOS-L-1 conditions for 2000 h, respectively.</p>

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Enhancing Phonon Group Velocities and Interfacial Heat Conduction for Efficient and Stable Perovskite Solar Cells

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年7月21日

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  • Xing Wu,
  • Yu Chen,
  • Yang Shen,
  • Er-Wei Du,
  • Hao Chen,
  • Songlin Liu,
  • Yang Peng,
  • Jing Zhou,
  • Yuwei Duan,
  • Yao Chen,
  • Shengyan Pu,
  • Yihui Wu,
  • Qiang Peng

摘要

The inherently low thermal conductivity of conventional hole-transport layers (HTLs) in inverted perovskite solar cells (PSCs) introduces a substantial discrepancy in interlayer heat-transfer dynamics, leading to detrimental heat accumulation and nonradiative recombination. Herein, we develop a spinel-type semiconductor of CuBi2O4, and integrate it into a composite HTL architecture to regulate heat conduction for the first time. Leveraging enhanced phonon group velocities, the CuBi2O4-based composite HTL achieves exceptional thermal compatibility with the perovskite absorber, demonstrating enhanced heat conduction and optimal thermal-expansion coefficient alignment. These synergistic effects significantly delay hot-carrier relaxation and reduce excess energy dissipation by approximately 10-fold. Consequently, we obtain high-quality perovskite films with ordered orientation and released residual strain, yielding an impressive power conversion efficiency (PCE) of 27.18% (certified 26.83%). Remarkably, these phonon-engineered devices maintain 90.1%, 82.3%, 85.6% and 93.7% of their initial PCEs under ISOS-D-2Ⅰ, ISOS-D-3, ISOS-T-1 and ISOS-L-1 conditions for 2000 h, respectively.