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Efficient photovoltaic effect in graphene/h-BN/silicon heterostructure self-powered photodetector 被引量:4
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作者 Ui Yeon Won Boo Heung Lee +5 位作者 young rae kim Won Tae Kang Ilmin Lee Ji Eun kim young Hee Lee Woo Jong Yu 《Nano Research》 SCIE EI CAS CSCD 2021年第6期1967-1972,共6页
Graphene(Gr)/Si-based optoelectronic devices have attracted a lot of academic attention due to the simpler fabrication processes,low costs,and higher performance of their two-dimensional(2D)/three-dimensional(3D)hybri... Graphene(Gr)/Si-based optoelectronic devices have attracted a lot of academic attention due to the simpler fabrication processes,low costs,and higher performance of their two-dimensional(2D)/three-dimensional(3D)hybrid interfaces in Schottky junction that promotes electron-hole separation.However,due to the built-in potential of Gr/Si as a photodetector,the Iph/Idark ratio is often hindered near zero-bias at relatively low illumination intensity.This is a major drawback in self-powered photodetectors.In this study,we have demonstrated a self-powered van der Waals heterostructure photodetector in the visible range using a Gr/hexagonal boron nitride(h-BN)/Si structure and clarified that the thin h-BN insertion can engineer asymmetric carrier transport and avoid interlayer coupling at the interface.The dark current was able to be suppressed by inserting an h-BN insulator layer,while maintaining the photocurrent with minimal decrease at near zero-bias.As a result,the normalized photocurrent-to-dark ratio(NPDR)is improved more than 104 times.Also,both Iph/Idark ratio and detectivity,increase by more than 104 times at−0.03 V drain voltage.The proposed Gr/h-BN/Si heterostructure is able to contribute to the introduction of next-generation photodetectors and photovoltaic devices based on graphene or silicon. 展开更多
关键词 GRAPHENE hexagonal boron nitride van der Waals heterostructure self-powered Research
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