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<p>This study reports the sol–gel spin coating of copper&#xa0;magnesium&#xa0;tin sulfide, Cu<sub>2</sub>MgSnS<sub>4</sub> (CMTS) thin films using a methanol-based precursor. The films were deposited on glass substrates and annealed at 250 and 350&#xa0;°C. The structural, morphological, and optical properties were characterized by XRD, SEM, EDS, FTIR, and UV–Vis spectroscopy. XRD study reveals the amorphous nature of the film. The as‐deposited CMTS films are covered by a sparse network of randomly oriented, micron‐scale rod‐like aggregates. In contrast, after annealing, the surface becomes dense, uniform, and granular. The EDS confirmed the presence of Cu, Mg, Sn, and S in the films in non-stoichiometric compositions. The FTIR study indicates metal–sulfur bonding. Optical analysis showed absorption coefficients exceeding 10<sup>4</sup> cm<sup>−1</sup> and a direct bandgap of 1.72 eV for 260 nm films, suitable for photovoltaic applications. The temperature-dependent electrical resistivity study indicates semiconducting behavior with a resistivity of around 10<sup>−3</sup> Ω cm. The results highlight CMTS as a scalable, eco-friendly absorber for solar devices.</p>

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Preparation and characterization of spin-coated Cu2MgSnS4 thin films for photovoltaic applications

  • 期刊论文

  • 发表日期：

    2026年4月15日

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  • Shad Afif Sovon,
  • Most. Halima Khatun,
  • M. Julkarnain

摘要

This study reports the sol–gel spin coating of copper magnesium tin sulfide, Cu2MgSnS4 (CMTS) thin films using a methanol-based precursor. The films were deposited on glass substrates and annealed at 250 and 350 °C. The structural, morphological, and optical properties were characterized by XRD, SEM, EDS, FTIR, and UV–Vis spectroscopy. XRD study reveals the amorphous nature of the film. The as‐deposited CMTS films are covered by a sparse network of randomly oriented, micron‐scale rod‐like aggregates. In contrast, after annealing, the surface becomes dense, uniform, and granular. The EDS confirmed the presence of Cu, Mg, Sn, and S in the films in non-stoichiometric compositions. The FTIR study indicates metal–sulfur bonding. Optical analysis showed absorption coefficients exceeding 104 cm−1 and a direct bandgap of 1.72 eV for 260 nm films, suitable for photovoltaic applications. The temperature-dependent electrical resistivity study indicates semiconducting behavior with a resistivity of around 10−3 Ω cm. The results highlight CMTS as a scalable, eco-friendly absorber for solar devices.