A Self-Powered Solar-Blind Photodetector with Large Voc Enhancing Performance Based on PEDOT:PSS/Ga2O3 Organic-Inorganic Hybrid Heterojunction
Self-powered photodetectors, that can convert suitable light into an electrical signal without power supply, are the important and fundamental building blocks in wide applications of environmental monitoring, light-wave communication, territory intrusions and imaging technology. Motivated by the goals of fabricating good reliability, high efficiency and cost-efficient self-powered photodetector realizing zero power consuming, we construct an organic-inorganic hybrid photodetector with large open-circuit voltage (Voc) based on poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS)/Ga2O3 heterojunction. The prepared hybrid photodetector demonstrates a prominent self-powered photodetection performance with fantastic responsivity of 37.4 mA/W, superior detectivity of 9.2×1012 Jones and high external quantum efficiency of 18.3% at zero bias with light-254 nm illumination of 0.3 μW/cm2. Under excitation of 248 nm pulse laser, the photodetector shows ultrafast response speed with rise time of 3.3 μs and decay time of 71.2 μs. Furthermore, the hybrid photodetector displays specific solar-blind spectrum selectivity with a high R250 nm/R360 nm rejection ratio of 7×103 and good stability in ambient air even through one-week storage. The excellent photoelectric performance of the hybrid self-powered photodetector is mainly profited from the efficient separation of photogenerated electron-hole pairs driven by the built-in electric field and the large photovoltaic effect (Voc≈0.9 V) of the PEDOT:PSS/Ga2O3 heterojunction. With the ability of harvesting photon energy from the deep space to support the operation, such low cost and high performance self-powered photodetector will open the potential application in space exploration.
- This article is part of the themed collection: 2019 Journal of Materials Chemistry C HOT Papers