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<p>Coumarin-based organic layers have attracted considerable attention in optoelectronic device applications due to their favorable optical and electronic properties. However, the incorporation of bathocuproine (BCP) into a coumarin/p-Si architecture and its systematic evaluation in terms of responsivity, detectivity, photocapacitance, and interface state density have not been systematically reported. In this study, coumarin–BCP composite layers containing 10 wt% and 20 wt% BCP were prepared, and Al/p-Si/coumarin:BCP/Al devices were fabricated. The electrical and optoelectronic properties were investigated under visible-light illumination (20–100 mW/cm<sup>2</sup>). The device containing 20% BCP exhibited enhanced performance, achieving a responsivity of 54.62&#xa0;mA/W and a specific detectivity of 1.69 × 10<sup>12</sup> Jones at 100 mW/cm<sup>2</sup>, compared to 18.64&#xa0;mA/W and 5.77 × 10<sup>11</sup> Jones for the 10% BCP device. The improved photoresponse is attributed to enhanced charge transport and interface-related effects induced by increased BCP concentration. These results demonstrate that coumarin–BCP composite-based Al/p-Si devices are promising candidates for visible-light photodetector and photosensor applications.</p>

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Advanced Analysis of Coumarin-Based Al/PSi Photodetectors with Fytronix Solar Simulator Technologies

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月23日

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  • Mesut Yalcin,
  • Aysegul Dere,
  • Fahrettin Yakuphanoglu

摘要

Coumarin-based organic layers have attracted considerable attention in optoelectronic device applications due to their favorable optical and electronic properties. However, the incorporation of bathocuproine (BCP) into a coumarin/p-Si architecture and its systematic evaluation in terms of responsivity, detectivity, photocapacitance, and interface state density have not been systematically reported. In this study, coumarin–BCP composite layers containing 10 wt% and 20 wt% BCP were prepared, and Al/p-Si/coumarin:BCP/Al devices were fabricated. The electrical and optoelectronic properties were investigated under visible-light illumination (20–100 mW/cm2). The device containing 20% BCP exhibited enhanced performance, achieving a responsivity of 54.62 mA/W and a specific detectivity of 1.69 × 1012 Jones at 100 mW/cm2, compared to 18.64 mA/W and 5.77 × 1011 Jones for the 10% BCP device. The improved photoresponse is attributed to enhanced charge transport and interface-related effects induced by increased BCP concentration. These results demonstrate that coumarin–BCP composite-based Al/p-Si devices are promising candidates for visible-light photodetector and photosensor applications.