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<p>The development of low-cost, stable, and efficient hole transport layers (HTLs) is crucial to the advancement of lead-free perovskite solar cells. In this work, a solution-based oxidation process is employed to convert spin-coated copper iodide (CuI) films into mixed-phase copper oxide (Cu<sub>x</sub>O) thin films comprising Cu₂O and CuO. Oxidation occurs under moderate temperatures (200–300°C), leading to uniform, compact, and highly conductive p-type films with tunable bandgaps. Structural, morphological, and optical analysis confirms successful phase transformation, and measurements of Hall effect reveal maximum mobility of holes of 26.7 cm<sup>2</sup>&#xa0;V<sup>−1</sup>&#xa0;s<sup>−1</sup> for double-coated films annealed at 300°C. Device simulations via SCAPS-1D using these measured properties predict that Cu<sub>x</sub>O HTLs can make high-efficiency lead-free perovskite solar cells with Cs₂AgBi<sub>₁−x</sub>SbₓBr₆ absorbers. While experimental device integration is yet to be demonstrated, this research lays the foundation for oxidized CuI-derived Cu<sub>x</sub>O as a potential candidate inorganic HTL for green photovoltaics and offers thoughtful guidance for subsequent experimentation.</p>

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CuI-Derived CuxO Thin Films Development via Thermal Oxidation for Lead-Free Perovskite Solar Cells

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年9月18日

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  • Md. Jakir Hossen,
  • Md. Shahinuzzaman,
  • M. S. Jamal,
  • Suhana Mohd Said,
  • S. F. W. M. Hatta,
  • Md. Helal Miah,
  • Mayeen Uddin Khandaker,
  • Mohammad Nur-E-Alam,
  • Mohammad Aminul Islam

摘要

The development of low-cost, stable, and efficient hole transport layers (HTLs) is crucial to the advancement of lead-free perovskite solar cells. In this work, a solution-based oxidation process is employed to convert spin-coated copper iodide (CuI) films into mixed-phase copper oxide (CuxO) thin films comprising Cu₂O and CuO. Oxidation occurs under moderate temperatures (200–300°C), leading to uniform, compact, and highly conductive p-type films with tunable bandgaps. Structural, morphological, and optical analysis confirms successful phase transformation, and measurements of Hall effect reveal maximum mobility of holes of 26.7 cm2 V−1 s−1 for double-coated films annealed at 300°C. Device simulations via SCAPS-1D using these measured properties predict that CuxO HTLs can make high-efficiency lead-free perovskite solar cells with Cs₂AgBi₁−xSbₓBr₆ absorbers. While experimental device integration is yet to be demonstrated, this research lays the foundation for oxidized CuI-derived CuxO as a potential candidate inorganic HTL for green photovoltaics and offers thoughtful guidance for subsequent experimentation.