Preparation and performance enhancement study of organic ZnO/Au/PEDOT:PSS heterojunction UV photodetector

Organic/inorganic hybrid material properties and their interfaces are essential to obtain excellent device performance. In this paper, an heterojunction ultraviolet (UV) organic photodetector (OPD) based on organic/inorganic zinc oxide (ZnO)/aurum (Au)/poly (3,4-ethylenedioxythio-phene):poly(4-styrene-sulfonate) (PEDOT:PSS) was manufactured and display outstanding photoelectric performance. For the fabrication of ZnO/Au/PEDOT:PSS heterojunction UV OPD, this heterojunction exhibits excellent UV optical detection performance. And further analysis using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), energy dispersive X-ray (EDX) and atomic force microscope (AFM). Compared with ZnO UV PD, the responsivity of ZnO/Au/PEDOT:PSS heterojunction UV OPD reaches 0.181 A W −1 , which is about 3.69 times higher. Furthermore, ZnO/Au/PEDOT:PSS heterojunction UV OPD shows light-to-dark current ratio (I light /I dark ) (1.19 × 10 3 ), external quantum efficiency (EQE) (59%), detectivity (D*) (1.39 × 10 11 Jones) and linear dynamic range (LDR) (61.5 dB). The preparation of inorganic/organic ZnO/Au/PEDOT:PSS heterojunction UV OPD in this work exhibits small organic/inorganic stress at the heterojunction, which provides new insights for the research of organic/inorganic hybrid UV OPDs and application prospects.