Although recent breakthroughs in reported graphene-based phototransistors with embedded quantum dots (QDs) have definitely been astonishing, there are still some obstacles in their practical use with regard to their electrical and optical performances. We show that through optimization of the vertical graphene nanoribbon (GNR)/QD/IGZO heterostructure and the ultrahigh efficiency of CsPbBr3 QDs, it is possible to significantly increase the on/off ratio (>103), the subthreshold slope (S.S., 0.9 V dec1), the device's field effect mobility (FET, 13 cm1 V1 S1) and other electrical properties. Subsequently, on the basis of the extra opticalelectrical characterization, we attribute the enhanced photosensitivity (800), the accelerated detecting speed (141 s) and the high detectivity (7.5 1014 cm Hz1/2 W1) to the vertical heterostructure associated with the optimized GNR component. To further demonstrate this enhancement phenomenon, the mechanism and theory mode of this vertical heterostructure are analyzed and exploited in this letter. This research indicates that a highly sensitive and fast phototransistor can be realized using the novel GNR/QD/IGZO vertical heterostructure and the long diffusion length of the perovskite QD photosensing component.
Nanoscale – Royal Society of Chemistry
Published: May 22, 2018
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