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Efficient photovoltaic effect in graphene/h-BN/silicon heterostructure self-powered photodetector

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Title
Efficient photovoltaic effect in graphene/h-BN/silicon heterostructure self-powered photodetector
Author(s)
Ui Yeon Won; Boo Heung Lee; Young Rae Kim; Won Tae Kang; Ilmin Lee; Ji Eun Kim; Young Hee Lee; Woo Jong Yu
Subject
HEXAGONAL BORON-NITRIDE, ; HIGH-PERFORMANCE, ; HIGH-RESPONSIVITY, ; SOLAR-CELLS, ; SCHOTTKY, ; SILICON, ; HETEROJUNCTIONS, ; ANTIREFLECTION, ; SENSITIVITY, ; OXIDE
Publication Date
2021-06
Journal
NANO RESEARCH, v.14, no.6, pp.1967 - 1972
Publisher
TSINGHUA UNIV PRESS
Abstract
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, theI(ph)/I(dark)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 10(4)times. Also, bothI(ph)/I(dark)ratio and detectivity, increase by more than 10(4)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.
URI
https://pr.ibs.re.kr/handle/8788114/9481
DOI
10.1007/s12274-020-2866-x
ISSN
1998-0124
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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