An HBS@GaSe:Dy-Based Organic/Inorganic Hybrid Heterojunction for High-Performance Multicolor Photodetectors

Herein, a multicolor heterojunction photodetector was fabricated using organic Hibiscus sabdariffa (HBS) material and two-dimensional (2D) dysprosium-doped GaSe as an HBS@GaSe design. For the fabricated hybrid heterojunction, multicolor broadband photodetection covering UV–vis–NIR spectra is observed for the light power density of 7 mW/cm2, and the optoelectronic properties of the heterojunction photodetector were studied in detail. Electrooptical measurements were performed with I–V measurements under white light as well as under 365 nm violet (UV), 590 nm (yellow), and 850 nm IR light irradiation. For this purpose, the key parameters of a photodetector, such as ON/OFF ratio, responsivity, specific detectivity, NPDR, NEP, and EQE, have been calculated. Under illumination of 590 nm, a maximum ON/OFF ratio of 1.8 × 104 was observed for −1.76 V reverse bias. The photodetectors exhibit excellent photoresponse properties, with a high responsivity of 2166 mA/W, an EQE of 736%, and a high detectivity of 6.81 × 1012 Jones at 590 nm. The high responsivity was attributed to the interfacial traps, enhancing the photoconductivity gain. Our work suggests that the HBS@GaSe-based organic/inorganic hybrid heterojunction is a promising candidate for ultrasensitive multicolor photodetection.