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

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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.

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Acknowledgement

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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Author notes

  1. Khang June Lee and Cheolmin Park contributed equally to this work.

Authors and Affiliations

  1. 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

    Khang June Lee, Cheolmin Park, Hyeok Jun Jin, Gwang Hyuk Shin & Sung-Yool Choi

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  1. Khang June Lee
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  2. Cheolmin Park
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  3. Hyeok Jun Jin
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  4. Gwang Hyuk Shin
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  5. Sung-Yool Choi
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Corresponding author

Correspondence to Sung-Yool Choi.

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12274_2020_3154_MOESM1_ESM.pdf

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

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Lee, K.J., Park, C., Jin, H.J. et al. Atomically thin heterostructure with gap-mode plasmon for overcoming trade-off between photoresponsivity and response time. Nano Res. 14, 1305–1310 (2021). https://doi.org/10.1007/s12274-020-3154-5

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  • DOI: https://doi.org/10.1007/s12274-020-3154-5

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