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<p>Perovskite solar cells (PSCs) have surpassed 26% power conversion efficiency (PCE), yet their commercialization is hindered by challenges in the design and optimization of the electron transport layer (ETL). This review elucidates cutting-edge advancements in electron transport layer materials (ETMs) and their fundamental mechanisms. Atomic defect engineering in metal oxides (e.g., F-doped SnO₂) achieves a record electron mobility 320&#xa0;cm<sup>2</sup>&#xa0;V<sup>−1</sup>&#xa0;s<sup>−1</sup>, whereas 2D nanolayers (e.g., MXenes, BP) empower flexible photovoltaics to reach a PCE of 24.7% with 95% operational stability across 5000 bending cycles. Tandem perovskite-silicon architectures have reached a certified 34.6% efficiency, benefiting from optimized ETL band alignment and reduced optical losses. A novel “dynamic band alignment” theory, experimentally validated through situ characterization and density functional theory (DFT) simulations, reveals real-time Fermi-level shifts at the ETL/perovskite interface, suppressing 90% of nonradiative recombination and reducing voltage loss to 0.35 V. Beyond efficiency, this review explores interface physics such as ion polarization in heterojunctions and highlights sustainable strategies such as bio-derived carbon ETL. This work establishes a roadmap for the commercialization of stable and efficient PSCs.</p>

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Electron transport layer materials of perovskite solar cells

  • 期刊论文

  • 发表日期：

    2025年4月30日

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  • Gaojun Jia,
  • Yi Fang,
  • Xiaoli Song,
  • Mingsi Xie,
  • Ruijuan Liao,
  • Ting Geng,
  • Chunxiu Zhang,
  • Ao Zhang,
  • Haifeng Yu

摘要

Perovskite solar cells (PSCs) have surpassed 26% power conversion efficiency (PCE), yet their commercialization is hindered by challenges in the design and optimization of the electron transport layer (ETL). This review elucidates cutting-edge advancements in electron transport layer materials (ETMs) and their fundamental mechanisms. Atomic defect engineering in metal oxides (e.g., F-doped SnO₂) achieves a record electron mobility 320 cm2 V−1 s−1, whereas 2D nanolayers (e.g., MXenes, BP) empower flexible photovoltaics to reach a PCE of 24.7% with 95% operational stability across 5000 bending cycles. Tandem perovskite-silicon architectures have reached a certified 34.6% efficiency, benefiting from optimized ETL band alignment and reduced optical losses. A novel “dynamic band alignment” theory, experimentally validated through situ characterization and density functional theory (DFT) simulations, reveals real-time Fermi-level shifts at the ETL/perovskite interface, suppressing 90% of nonradiative recombination and reducing voltage loss to 0.35 V. Beyond efficiency, this review explores interface physics such as ion polarization in heterojunctions and highlights sustainable strategies such as bio-derived carbon ETL. This work establishes a roadmap for the commercialization of stable and efficient PSCs.