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Research Article

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

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
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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

photodetectorsatomically thin heterostructuregap-mode plasmonshigh responsivityfast response time

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Nano Research
Volume 14 Issue 5,
May 2021
Pages 1305-1310
DOI: 10.1007/s12274-020-3154-5
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
Topics:
Photocurrents PlasmonsSemiconductor junctions

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Received: 28 July 2020
Revised: 07 September 2020
Accepted: 30 September 2020
Published: 29 December 2020
© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature
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