Atomically thin heterostructure with gap-mode plasmon for overcoming trade-off between photoresponsivity and response time
| Autor: | Gwang Hyuk Shin, Hyeok Jun Jin, Cheolmin Park, Sung-Yool Choi, Khang June Lee |
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| Rok vydání: | 2020 |
| Předmět: |
Photocurrent
Materials science business.industry Photodetector Response time Heterojunction 02 engineering and technology Photodetection 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Atomic and Molecular Physics and Optics 0104 chemical sciences Responsivity Optoelectronics General Materials Science Laser power scaling Electrical and Electronic Engineering 0210 nano-technology business Plasmon |
| Zdroj: | Nano Research. 14:1305-1310 |
| ISSN: | 1998-0000 1998-0124 |
| DOI: | 10.1007/s12274-020-3154-5 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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