Abstract 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 2 ). The device containing 20% BCP exhibited enhanced performance, achieving a responsivity of 54.62 mA/W and a specific detectivity of 1.69 × 10 12 Jones at 100 mW/cm 2 , compared to 18.64 mA/W and 5.77 × 10 11 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.
Yalcin et al. (Sun,) studied this question.