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(a, b) Current vs voltage characteristics of the bilayer heterojunction photodetector (glass/ZnO/Ag/CuFeS2) and the single-layer photodetector (glass/CuFeS2/Ag). Schematic device structure of (c) the bilayer heterojunction and (d) the single-layer photodetector. Band diagram and charge transport of (e) the bilayer heterojunction device and (f) the single-layer device.
