期刊
SCIENTIFIC REPORTS
卷 5, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/srep14304
关键词
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资金
- National Natural Science Foundation of China [61405132, 91233119, 61204066]
- Natural Science Foundation of Jiangsu Province of China [BK20141200, BK20140349, BK20140312]
- Ph.D. Programs Foundation of Ministry of Education of China [20133201110021]
- Natural Science Foundation of the Jiangsu Higher Education Institutions of China [14KJB140013]
- China Postdoctoral Science Foundation [2014M550301, 2014M551646]
- Jiangsu Planned Projects for Postdoctoral Research Funds [1302100B]
- Priority Academic Program Development (PAPD) of Jiangsu Higher Education Institutions
We propose an architecture of conformal metal-semiconductor-metal (MSM) device for hot-electron photodetection by asymmetrical alignment of the semiconductor barrier relative to the Fermi level of metals and strong energy localization through plasmonic resonances. Compared with the conventional grating design, the multi-layered grating system under conformal configuration is demonstrated to possess both optical and electrical advantages for high-sensitivity hot-electron photodetection. Finite-element simulation reveals that a strong and highly asymmetrical optical absorption (top metal absorption >99%) can be realized under such a conformal arrangement. An analytical probability-based electrical simulation verifies the strong unidirectional photocurrent, by taking advantage of the extremely high net absorption and a low metal/semiconductor barrier height, and predicts that the corresponding photoresponsivity can be similar to 3 times of that based on the conventional grating design in metal-insulator-metal (MIM) configuration.
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