Multioperation-Mode Light-Emitting Field-Effect Transistors Based on van der Waals Heterostructure

Junyoung Kwon, June Chul Shin, Huije Ryu, Jae Yoon Lee, Dongjea Seo, Kenji Watanabe, Takashi Taniguchi, Young Duck Kim, James Hone, Chul Ho Lee, Gwan Hyoung Lee

Research output: Contribution to journalArticle

Abstract

2D semiconductors have shown great potential for application to electrically tunable optoelectronics. Despite the strong excitonic photoluminescence (PL) of monolayer transition metal dichalcogenides (TMDs), their efficient electroluminescence (EL) has not been achieved due to the low efficiency of charge injection and electron–hole recombination. Here, multioperation-mode light-emitting field-effect transistors (LEFETs) consisting of a monolayer WSe2 channel and graphene contacts coupled with two top gates for selective and balanced injection of charge carriers are demonstrated. Visibly observable EL is achieved with the high external quantum efficiency of ≈6% at room temperature due to efficient recombination of injected electrons and holes in a confined 2D channel. Further, electrical tunability of both the channel and contacts enables multioperation modes, such as antiambipolar, depletion,and unipolar regions, which can be utilized for polarity-tunable field-effect transistors and photodetectors. The work exhibits great potential for use in 2D semiconductor LEFETs for novel optoelectronics capable of high efficiency, multifunctions, and heterointegration.

Original languageEnglish
JournalAdvanced Materials
DOIs
Publication statusAccepted/In press - 2020

Keywords

  • 2D materials
  • WSe
  • electroluminescence
  • light-emitting transistors
  • van der Waals heterostructures

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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    Kwon, J., Shin, J. C., Ryu, H., Lee, J. Y., Seo, D., Watanabe, K., Taniguchi, T., Kim, Y. D., Hone, J., Lee, C. H., & Lee, G. H. (Accepted/In press). Multioperation-Mode Light-Emitting Field-Effect Transistors Based on van der Waals Heterostructure. Advanced Materials. https://doi.org/10.1002/adma.202003567