Highly Sensitive, Gate-Tunable, Room-Temperature Mid-Infrared Photodetection Based on Graphene–Bi2Se3 Heterostructure
| Autor: | Jekwan Lee, Nikesh Koirala, Young Geun Roh, Jun Park, Chihun In, Jisoo Moon, Moon-Ho Ham, Houk Jang, Sungwoo Hwang, Un Jeong Kim, Dohun Kim, Ji Ho Sung, Sung-Joon Park, Jong Hyun Ahn, Seongshik Oh, Sang-Soo Chee, Jae-Seok Kim, Sangwan Sim, Jae Bok Lee, Hong-Seok Lee, Minji Noh, Maryam Salehi, Hyunyong Choi, Moon-Ho Jo, Hyangsook Lee, Soonyoung Cha |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Graphene business.industry Band gap Photodetector Heterojunction 02 engineering and technology Photodetection 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics 0104 chemical sciences Electronic Optical and Magnetic Materials law.invention Responsivity Optics law Topological insulator Broadband Optoelectronics Electrical and Electronic Engineering 0210 nano-technology business Biotechnology |
| Zdroj: | ACS Photonics. 4:482-488 |
| ISSN: | 2330-4022 |
| DOI: | 10.1021/acsphotonics.6b00972 |
| Popis: | Broadband detection of mid-infrared (IR) photons extends to advanced optoelectronic applications such as imaging, sensing, and telecommunications. While graphene offers an attractive platform for broadband visible/IR photodetection, previous efforts to improve its responsivity, for example, by integrating light-absorbing colloids or waveguide or antenna fabrication, were achieved at the cost of reduced photon detection bandwidth. In this work, we demonstrate room-temperature operation of a novel mid-IR photodetector based on a graphene–Bi2Se3 heterostructure showing broadband detection and high responsivity (1.97 and 8.18 A/W at mid- and near-IR, respectively), in which simultaneous improvement of the spectral range and responsivity is achieved via exploiting broadband absorption of mid-IR and IR photons in a small-band-gap Bi2Se3 topological insulator and efficient hot carrier separation and strong photogating across the Bi2Se3/graphene interface. With sufficient room for further improvement by interface... |
| Databáze: | OpenAIRE |
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