Tunable Quantum Tunneling through a Graphene/Bi2Se3 Heterointerface for the Hybrid Photodetection Mechanism
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2021-12-15
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en
Pages
9
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ACS applied materials & interfaces, Volume 13, issue 49, pp. 58927-58935
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 using tunable 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