Dirac plasmon-assisted asymmetric hot carrier generation for room-temperature infrared detection
| Autor: | Michael N. Leuenberger, Sayan Chandra, Muhammad Waqas Shabbir, Alireza Safaei, Debashis Chanda |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
0301 basic medicine
Materials science Band gap Infrared Science General Physics and Astronomy Photodetector 02 engineering and technology Photodetection General Biochemistry Genetics and Molecular Biology Article law.invention 03 medical and health sciences Responsivity law Thermoelectric effect lcsh:Science Plasmon Multidisciplinary Graphene business.industry General Chemistry 021001 nanoscience & nanotechnology 030104 developmental biology Optical properties and devices Optoelectronics lcsh:Q 0210 nano-technology business |
| Zdroj: | Nature Communications, Vol 10, Iss 1, Pp 1-7 (2019) Nature Communications |
| ISSN: | 2041-1723 |
| Popis: | Due to the low photon energy, detection of infrared photons is challenging at room temperature. Thermoelectric effect offers an alternative mechanism bypassing material bandgap restriction. In this article, we demonstrate an asymmetric plasmon-induced hot-carrier Seebeck photodetection scheme at room temperature that exhibits a remarkable responsivity of 2900 VW−1, detectivity of 1.1 × 109 Jones along with a fast response of ~100 ns in the technologically relevant 8–12 µm band. This is achieved by engineering the asymmetric electronic environment of the generated hot carriers on chemical vapor deposition grown large area nanopatterned monolayer graphene, which leads to a temperature gradient of 4.7 K across the device terminals for an incident power of 155 nW, thereby enhancing the photo-thermoelectric voltage by manifold compared to previous reports. The results presented outline a strategy for uncooled, tunable, and multispectral infrared detection. Designing electronically asymmetric environment across monolayer graphene enhances the photo-thermoelectric effect and enables efficient infrared photodetection. Here, the authors report a photodetector based on CVD grown nano-patterned graphene with high responsivity of ~2900 V/W within 8–12 µm wavelength regime by Dirac plasmon-assisted hot carrier generation at room-temperature. |
| Databáze: | OpenAIRE |
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