Tunable Quantum Tunneling through a Graphene/Bi2Se3 Heterointerface for the Hybrid Photodetection Mechanism

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2021-12-15
Major/Subject
Mcode
Degree programme
Language
en
Pages
58927–58935
Series
ACS applied materials & interfaces, Volume 13, issue 49
Abstract
Graphene-based van der Waals heterostructures are promising building blocks for broadband photodetection because of the gapless nature of graphene. However, their performance is mostly limited by the inevitable trade-off between low dark current and photocurrent generation. Here, we demonstrate a hybrid photodetection mode based on the photogating effect coupled with the photovoltaic effect via tunable quantum tunneling through the unique graphene/Bi2Se3 heterointerface. The tunneling junction formed between the semimetallic graphene and the topologically insulating Bi2Se3 exhibits asymmetric rectifying and hysteretic current-voltage characteristics, which significantly suppresses the dark current and enhances the photocurrent. The photocurrent-to-dark current ratio increases by about a factor of 10 with the electrical tuning of tunneling resistance for efficient light detection covering the major photonic spectral band from the visible to the mid-infrared ranges. Our findings provide a novel concept of usingtunable quantum tunneling for highly sensitive broadband photodetection in mixed-dimensional van der Waals heterostructures.
Description
| openaire: EC/H2020/820423/EU//S2QUIP | openaire: EC/H2020/834742/EU//ATOP
Keywords
tunable quantum tunneling, graphene, topological insulator, heterointerface, asymmetric barrier, hybrid photodetection, 2-DIMENSIONAL MATERIALS, BROAD-BAND, HETEROSTRUCTURES, RESISTANCE, TRANSPORT
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Citation
Yoon , H H , Ahmed , F , Dai , Y , Fernandez Pizarro , H , Cui , X , Bai , X , Li , D , Du , M , Lipsanen , H & Sun , Z 2021 , ' Tunable Quantum Tunneling through a Graphene/Bi2Se3 Heterointerface for the Hybrid Photodetection Mechanism ' , ACS applied materials & interfaces , vol. 13 , no. 49 , pp. 58927-58935 . https://doi.org/10.1021/acsami.1c18606