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<p>This study explores the structural, morphological, thermal, optical, and electrical properties of Bromothymol Blue (BTB) thin films deposited on glass and silicon substrates using thermal evaporation. The thermal stability of BTB was analyzed using thermogravimetric analysis (TGA), revealing stability up to 230&#xa0;°C and a two-step decomposition process. X-ray diffraction (XRD) and scanning electron microscopy (SEM) confirmed the nanocrystalline structure and textured surface morphology of the deposited films. UV–Vis spectroscopy highlighted BTB’s absorption properties, with band gaps of 2.108 eV (direct) and 2.322 eV (indirect). Electrical characterization of an Al/p-Si/BTB/Au heterojunction indicated rectifying behavior, with space charge-limited conduction dominating at higher voltages. These findings suggest BTB’s potential in optoelectronic applications, including photodiodes and sensors, due to its unique optical properties and thermal stability.</p>

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Fabrication and Characterization of Bromothymol Blue Nanocrystalline Films for Potential Optoelectronic Applications

  • 期刊论文

  • 发表日期：

    2025年1月22日

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  • A. M. Mansour,
  • M. K. Seddeek

摘要

This study explores the structural, morphological, thermal, optical, and electrical properties of Bromothymol Blue (BTB) thin films deposited on glass and silicon substrates using thermal evaporation. The thermal stability of BTB was analyzed using thermogravimetric analysis (TGA), revealing stability up to 230 °C and a two-step decomposition process. X-ray diffraction (XRD) and scanning electron microscopy (SEM) confirmed the nanocrystalline structure and textured surface morphology of the deposited films. UV–Vis spectroscopy highlighted BTB’s absorption properties, with band gaps of 2.108 eV (direct) and 2.322 eV (indirect). Electrical characterization of an Al/p-Si/BTB/Au heterojunction indicated rectifying behavior, with space charge-limited conduction dominating at higher voltages. These findings suggest BTB’s potential in optoelectronic applications, including photodiodes and sensors, due to its unique optical properties and thermal stability.