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<p>This work investigates the influence of bath pH on the structural, morphological, compositional, optical, electrical, and thermoelectric properties of chemically deposited AgSbS₂ thin films. The objective was to elucidate how acidic and basic deposition media affect film quality and functional performance. X-ray diffraction revealed a phase transition from monoclinic/trigonal to cubic structure with increasing pH, accompanied by an increase in crystallite size from 55 to 82&#xa0;nm. SEM and EDX analyses confirmed denser grain morphology and near-stoichiometric composition. The basic film exhibited a lower optical band gap (1.69&#xa0;eV), reduced Urbach energy (325 meV), higher refractive index (2.58–2.42), and larger extinction coefficient (0.257–0.201) than the acidic film. Electrical conductivity increased from 1.8 × 10⁻⁴ to 1.2 × 10⁻² S cm⁻¹ (acidic) and 3.5 × 10⁻³ to 8.5 × 10⁻² S cm⁻¹ (basic) over 300–525&#xa0;K. The Seebeck coefficient varied from 180 to 252 µV K⁻¹ (acidic) and 102–164 µV K⁻¹ (basic), confirming p-type conduction. These results demonstrate that basic-medium deposition significantly enhances the optoelectronic and thermoelectric performance of AgSbS₂ thin films for photovoltaic and energy-conversion applications.</p>

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Influence of pH on structural, optical, electrical and thermoelectric properties of chemically deposited AgSbS₂ thin films

  • 期刊论文

  • 发表日期：

    2026年7月24日

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  • Prashant Chate,
  • Dattatray Sathe

摘要

This work investigates the influence of bath pH on the structural, morphological, compositional, optical, electrical, and thermoelectric properties of chemically deposited AgSbS₂ thin films. The objective was to elucidate how acidic and basic deposition media affect film quality and functional performance. X-ray diffraction revealed a phase transition from monoclinic/trigonal to cubic structure with increasing pH, accompanied by an increase in crystallite size from 55 to 82 nm. SEM and EDX analyses confirmed denser grain morphology and near-stoichiometric composition. The basic film exhibited a lower optical band gap (1.69 eV), reduced Urbach energy (325 meV), higher refractive index (2.58–2.42), and larger extinction coefficient (0.257–0.201) than the acidic film. Electrical conductivity increased from 1.8 × 10⁻⁴ to 1.2 × 10⁻² S cm⁻¹ (acidic) and 3.5 × 10⁻³ to 8.5 × 10⁻² S cm⁻¹ (basic) over 300–525 K. The Seebeck coefficient varied from 180 to 252 µV K⁻¹ (acidic) and 102–164 µV K⁻¹ (basic), confirming p-type conduction. These results demonstrate that basic-medium deposition significantly enhances the optoelectronic and thermoelectric performance of AgSbS₂ thin films for photovoltaic and energy-conversion applications.