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<p>A popular quaternary semiconductor absorber for thin-film solar cells, Cu<sub>2</sub>ZnSnS<sub>4</sub> (CZTS) is prized for its advantageous photovoltaic characteristics, elemental abundance, and affordability of manufacture. We show that the precise balance between kinetic energy transmission and thermal activation controls the quality of the material. Adatom mobility is improved by raising the deposition temperature, which also promotes crystallite size and lowers lattice strain—both of which are essential for improved ordering. Temperatures above this, however, cause a significant compositional variation because of volatility (loss of S and Zn), creating a Sn-rich environment that encourages secondary phases with narrow band gaps and causes the band gap to shift to 1.34&#xa0;eV. Sputtering kinetics and gas-phase dynamics are controlled by the Ar flow rate. An ideal flow rate of 80 SCCM improves gas-phase scattering, reducing energetic particle damage and resulting in the best structural integrity and elemental incorporation (ratio of 0.95 and peak ratio of 0.45). Crucially, increasing RF deposition power significantly improves the preferred re-sputtering of lighter elements, particularly Cu and S, from the expanding film surface. While increasing power encourages larger crystallite size, the significant kinetic damage causes extremely poor stoichiometry, resulting in substantial structural disorder (soft-mode Raman shift down to 333.2&#xa0;cm<sup>− 1</sup>). To create the most uniform, well-faceted, and dense morphology, combine high thermal energy (400℃) with rigorously controlled kinetic input (lower RF power and optimized Ar flow). This study provides a critical framework for optimizing RF sputtering parameters to overcome kinetic limits and produce high-quality kesterite thin films for advanced solar applications.</p>

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Decoupling kinetic and thermal effects in RF sputtered Cu2​ZnSnS4​ thin films for solar cell application

  • 期刊论文

  • 发表日期：

    2026年7月8日

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  • Kalyan B. Chavan,
  • Sachin V. Desarada,
  • Marut Salve,
  • Shweta Chaure,
  • Nandu B. Chaure

摘要

A popular quaternary semiconductor absorber for thin-film solar cells, Cu2ZnSnS4 (CZTS) is prized for its advantageous photovoltaic characteristics, elemental abundance, and affordability of manufacture. We show that the precise balance between kinetic energy transmission and thermal activation controls the quality of the material. Adatom mobility is improved by raising the deposition temperature, which also promotes crystallite size and lowers lattice strain—both of which are essential for improved ordering. Temperatures above this, however, cause a significant compositional variation because of volatility (loss of S and Zn), creating a Sn-rich environment that encourages secondary phases with narrow band gaps and causes the band gap to shift to 1.34 eV. Sputtering kinetics and gas-phase dynamics are controlled by the Ar flow rate. An ideal flow rate of 80 SCCM improves gas-phase scattering, reducing energetic particle damage and resulting in the best structural integrity and elemental incorporation (ratio of 0.95 and peak ratio of 0.45). Crucially, increasing RF deposition power significantly improves the preferred re-sputtering of lighter elements, particularly Cu and S, from the expanding film surface. While increasing power encourages larger crystallite size, the significant kinetic damage causes extremely poor stoichiometry, resulting in substantial structural disorder (soft-mode Raman shift down to 333.2 cm− 1). To create the most uniform, well-faceted, and dense morphology, combine high thermal energy (400℃) with rigorously controlled kinetic input (lower RF power and optimized Ar flow). This study provides a critical framework for optimizing RF sputtering parameters to overcome kinetic limits and produce high-quality kesterite thin films for advanced solar applications.