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- W2765988175 abstract "Ultrahigh sensitive phototransistors featuring a hybrid channel of graphene and a photoabsorbing nanomaterial which is backgated through a substrate have demonstrated photoresponsivity (in the range of 101–107 A/W). Although remarkable sensitivity has been validated on a variety of photoabsorbers such as quantum dots, perovskites, and, dyes, etc., basic physical principles and design parameters have not been well understood using a self-consistent model. In particular, the relative contribution of two distinct mechanisms for graphene photoconduction: (i) carrier injection from nanomaterial, and, (ii) photo-induced field effect from the substrate, is unclear. Here, we use self-consistent numerical simulations to quantify these effects and show that both mechanisms can have an equivalent effect when the substrate is undoped. As the substrate doping increases, the latter process rapidly falls off due to charge screening. We further explore the effect of source/drain/gate metal workfunction, substrate doping, and, carrier lifetimes and propose optimizations for performance enhancement." @default.
- W2765988175 created "2017-11-10" @default.
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- W2765988175 date "2017-09-01" @default.
- W2765988175 modified "2023-09-27" @default.
- W2765988175 title "Computational modeling of hybrid graphene/quantum dot photodetectors" @default.
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- W2765988175 doi "https://doi.org/10.23919/sispad.2017.8085299" @default.
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