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Nano Research 2021, 14(5): 1305-1310 https://doi.org/10.1007/s12274-020-3154-5
Research Article | Issue | Published: 29 December 2020

Atomically thin heterostructure with gap-mode plasmon for overcoming trade-off between photoresponsivity and response time

Show Author's Information Khang June Lee§,  Cheolmin Park§,  Hyeok Jun Jin,  Gwang Hyuk Shin,  Sung-Yool Choi( )
School of Electrical Engineering, Center for Advanced Materials Discovery towards 3D Displays, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea
Keywords:
photodetectors, atomically thin heterostructure, gap-mode plasmons, high responsivity, fast response time
Topics:
Photocurrents PlasmonsSemiconductor junctions
Cite this article:
Lee KJ, Park C, Jin HJ, et al. Atomically thin heterostructure with gap-mode plasmon for overcoming trade-off between photoresponsivity and response time. Nano Research, 2021, 14(5): 1305-1310. https://doi.org/10.1007/s12274-020-3154-5
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Abstract Full text Electronic supplementary material About this article

Two-dimensional (2D) materials have recently provided a new perspective on optoelectronics because of their unique layered structure and excellent physical properties. However, their potential use as optoelectric devices has been limited by the trade-off between photoresponsivity and response time. Here, based on a vertically stacked atomically thin p-n junction, we propose a gap-mode plasmon structure that simultaneously enables enhanced responsivity and rapid photodetection. The atomically thin 2D materials act as a spacer for enhancing the gap-mode plasmons, and their short transit length in the vertical direction allows fast photocarrier transport. We demonstrate a high responsivity of up to 8.67 A/W with a high operation speed that exceeds 35 MHz under a 30 nW laser power. Spectral photocurrent, absorption, and a numerical simulation are used to verify the effectiveness of the gap-mode plasmons in the device. We believe that the design strategy proposed in this study can pave the way for a platform to overcome the trade-off between responsivity and response time.


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About this article

Atomically thin heterostructure with gap-mode plasmon for overcoming trade-off between photoresponsivity and response time

Show Author's information Khang June Lee§, Cheolmin Park§, Hyeok Jun Jin, Gwang Hyuk Shin, Sung-Yool Choi( )
School of Electrical Engineering, Center for Advanced Materials Discovery towards 3D Displays, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea

Abstract

Two-dimensional (2D) materials have recently provided a new perspective on optoelectronics because of their unique layered structure and excellent physical properties. However, their potential use as optoelectric devices has been limited by the trade-off between photoresponsivity and response time. Here, based on a vertically stacked atomically thin p-n junction, we propose a gap-mode plasmon structure that simultaneously enables enhanced responsivity and rapid photodetection. The atomically thin 2D materials act as a spacer for enhancing the gap-mode plasmons, and their short transit length in the vertical direction allows fast photocarrier transport. We demonstrate a high responsivity of up to 8.67 A/W with a high operation speed that exceeds 35 MHz under a 30 nW laser power. Spectral photocurrent, absorption, and a numerical simulation are used to verify the effectiveness of the gap-mode plasmons in the device. We believe that the design strategy proposed in this study can pave the way for a platform to overcome the trade-off between responsivity and response time.

Keywords: photodetectors, atomically thin heterostructure, gap-mode plasmons, high responsivity, fast response time

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Publication history
Copyright
Acknowledgements

Publication history

Received: 28 July 2020
Revised: 07 September 2020
Accepted: 30 September 2020
Published: 29 December 2020
Issue date: May 2021

Copyright

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature

Acknowledgements

This work was supported by the National Research Foundation of Korea (NRF) through Basic Research Program (No. 2019R1A2C2009171) and Creative Materials Discovery Program (No. 2016M3D1A1900035).

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