Tunable Electrical and Optical Characteristics in Monolayer Graphene and Few-Layer MoS2 Heterostructure Devices

Servin Rathi, Inyeal Lee, Dongsuk Lim, Jianwei Wang, Yuichi Ochiai, Nobuyuki Aoki, Kenji Watanabe, Takashi Taniguchi, Gwan Hyoung Lee, Young Jun Yu, Philip Kim, Gil Ho Kim

Research output: Contribution to journalArticle

87 Citations (Scopus)

Abstract

Lateral and vertical two-dimensional heterostructure devices, in particular graphene-MoS2, have attracted profound interest as they offer additional functionalities over normal two-dimensional devices. Here, we have carried out electrical and optical characterization of graphene-MoS2 heterostructure. The few-layer MoS2 devices with metal electrode at one end and monolayer graphene electrode at the other end show nonlinearity in drain current with drain voltage sweep due to asymmetrical Schottky barrier height at the contacts and can be modulated with an external gate field. The doping effect of MoS2 on graphene was observed as double Dirac points in the transfer characteristics of the graphene field-effect transistor (FET) with a few-layer MoS2 overlapping the middle part of the channel, whereas the underlapping of graphene have negligible effect on MoS2 FET characteristics, which showed typical n-type behavior. The heterostructure also exhibits a strongest optical response for 520 nm wavelength, which decreases with higher wavelengths. Another distinct feature observed in the heterostructure is the peak in the photocurrent around zero gate voltage. This peak is distinguished from conventional MoS2 FETs, which show a continuous increase in photocurrent with back-gate voltage. These results offer significant insight and further enhance the understanding of the graphene-MoS2 heterostructure.

Original languageEnglish
Pages (from-to)5017-5024
Number of pages8
JournalNano letters
Volume15
Issue number8
DOIs
Publication statusPublished - 2015 Aug 12

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Tunable Electrical and Optical Characteristics in Monolayer Graphene and Few-Layer MoS<sub>2</sub> Heterostructure Devices'. Together they form a unique fingerprint.

  • Cite this

    Rathi, S., Lee, I., Lim, D., Wang, J., Ochiai, Y., Aoki, N., Watanabe, K., Taniguchi, T., Lee, G. H., Yu, Y. J., Kim, P., & Kim, G. H. (2015). Tunable Electrical and Optical Characteristics in Monolayer Graphene and Few-Layer MoS2 Heterostructure Devices. Nano letters, 15(8), 5017-5024. https://doi.org/10.1021/acs.nanolett.5b01030