Highly Sensitive, Gate-Tunable, Room-Temperature Mid-Infrared Photodetection Based on Graphene-Bi2Se3 Heterostructure

Jaeseok Kim, Sungjoon Park, Houk Jang, Nikesh Koirala, Jae Bok Lee, Un Jeong Kim, Hong Seok Lee, Young Geun Roh, Hyangsook Lee, Sangwan Sim, Soonyoung Cha, Chihun In, Jun Park, Jekwan Lee, Minji Noh, Jisoo Moon, Maryam Salehi, Jiho Sung, Sang Soo Chee, Moon Ho HamMoon Ho Jo, Seongshik Oh, Jong Hyun Ahn, Sung Woo Hwang, Dohun Kim, Hyunyong Choi

Research output: Contribution to journalArticle

22 Citations (Scopus)


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 engineering, our results show a promising route to realize ultrabroadband, high-responsivity hot-carrier optoelectronics at room temperature.

Original languageEnglish
Pages (from-to)482-488
Number of pages7
JournalACS Photonics
Issue number3
Publication statusPublished - 2017 Mar 15

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Biotechnology
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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    Kim, J., Park, S., Jang, H., Koirala, N., Lee, J. B., Kim, U. J., Lee, H. S., Roh, Y. G., Lee, H., Sim, S., Cha, S., In, C., Park, J., Lee, J., Noh, M., Moon, J., Salehi, M., Sung, J., Chee, S. S., ... Choi, H. (2017). Highly Sensitive, Gate-Tunable, Room-Temperature Mid-Infrared Photodetection Based on Graphene-Bi2Se3 Heterostructure. ACS Photonics, 4(3), 482-488. https://doi.org/10.1021/acsphotonics.6b00972