2019年9月
Detection of cyclotron resonance using photo-induced thermionic emission at graphene/MoS2 van der Waals interface
APPLIED PHYSICS LETTERS
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- 巻
- 115
- 号
- 14
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1063/1.5119932
- 出版者・発行元
- AMER INST PHYSICS
We demonstrate the detection of cyclotron resonance in graphene by a photo-induced thermionic emission mechanism at the graphene/MoS2 van der Waals (vdW) Schottky junction. At cyclotron resonance in Landau-quantized graphene, the infrared light is absorbed, and an electron-hole pair is generated. When the energy of a photoexcited electron exceeds the band offset energy at the graphene/MoS2 interface, the electron transfer occurs from graphene to the conduction band of MoS2, and the hole remains in graphene. This creates an electron-hole separation at the graphene/MoS2 interface at cyclotron resonance, and a photovoltage is generated. The proposed method is an infrared photodetection technique through out-of-plane transport at the vdW junction, which is distinct from the previously reported methods that use in-plane transport in graphene for electronic detection of the cyclotron resonance. Despite the simple structure of our device with a single-vdW junction, our method exhibits a very high sensitivity of similar to 10(6) V/W, which shows an improvement of three orders of magnitude over the previously reported values. Therefore, the proposed method displays a high potential for cyclotron resonance-based infrared photodetector applications.
- リンク情報
- ID情報
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- DOI : 10.1063/1.5119932
- ISSN : 0003-6951
- eISSN : 1077-3118
- Web of Science ID : WOS:000489308600025