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<p>The sensing performance of a p–n junction photodetector can be enhanced by incorporating an organic layer forming a hybrid organic–inorganic device. A p-Bi<sub>2</sub>O<sub>3</sub>/n-SnO<sub>2</sub> heterojunction-based visible-blind UV photodetector was synthesised using pulsed laser deposition. Thereafter, a PVA layer of different molar concentrations (0.3, 0.5 and 0.7&#xa0;M) was deposited on the p-Bi<sub>2</sub>O<sub>3</sub>/n-SnO<sub>2</sub> heterojunction to enhance and achieve selective UV sensing. The structural, surface morphological, optical and electrical properties of the PVA-coated devices were analysed. The p-Bi<sub>2</sub>O<sub>3</sub>/n-SnO<sub>2</sub> heterojunction exhibited a peak responsivity of 43.99 ± 3.74 AW<sup>−1</sup>, quantum efficiency of (2.11 ± 0.18) × 10<sup>4</sup>% and detectivity of (4.02 ± 0.77) × 10<sup>10</sup> Jones under 260&#xa0;nm UVC radiation at − 6.0&#xa0;V. The responsivity, quantum efficiency and detectivity increased to 59.58 ± 1.17 AW<sup>−1</sup>, (2.84 ± 0.06) × 10<sup>4</sup>% and (10.72 ± 0.9.4) × 10<sup>10</sup> Jones, respectively, upon adding the 0.3&#xa0;M PVA layer under UVC illumination. The study highlights that the combined effect of optical filtering and reduced dark current by introducing a PVA layer can tune the UV-selective response of the device. The devices with 0.3 and 0.5&#xa0;M PVA exhibit optimum UVC and UVA response, respectively. The <i>rise time</i>/<i>fall time</i> of the 0.3&#xa0;M PVA-coated device for UVC detection was 76.55/101.12&#xa0;ms and that of the 0.5&#xa0;M PVA-coated device for UVA detection was 152.80/192.19&#xa0;ms.</p>

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Role of polyvinyl alcohol (PVA) coating in tuneable UV detection of p-Bi2O3/n-SnO2 hybrid photodetector

  • 期刊论文

  • 发表日期：

    2026年4月24日

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  • Ronald P. Koushik,
  • J. M. Kalita

摘要

The sensing performance of a p–n junction photodetector can be enhanced by incorporating an organic layer forming a hybrid organic–inorganic device. A p-Bi2O3/n-SnO2 heterojunction-based visible-blind UV photodetector was synthesised using pulsed laser deposition. Thereafter, a PVA layer of different molar concentrations (0.3, 0.5 and 0.7 M) was deposited on the p-Bi2O3/n-SnO2 heterojunction to enhance and achieve selective UV sensing. The structural, surface morphological, optical and electrical properties of the PVA-coated devices were analysed. The p-Bi2O3/n-SnO2 heterojunction exhibited a peak responsivity of 43.99 ± 3.74 AW−1, quantum efficiency of (2.11 ± 0.18) × 104% and detectivity of (4.02 ± 0.77) × 1010 Jones under 260 nm UVC radiation at − 6.0 V. The responsivity, quantum efficiency and detectivity increased to 59.58 ± 1.17 AW−1, (2.84 ± 0.06) × 104% and (10.72 ± 0.9.4) × 1010 Jones, respectively, upon adding the 0.3 M PVA layer under UVC illumination. The study highlights that the combined effect of optical filtering and reduced dark current by introducing a PVA layer can tune the UV-selective response of the device. The devices with 0.3 and 0.5 M PVA exhibit optimum UVC and UVA response, respectively. The rise time/fall time of the 0.3 M PVA-coated device for UVC detection was 76.55/101.12 ms and that of the 0.5 M PVA-coated device for UVA detection was 152.80/192.19 ms.