journal article·2020-10

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

Advanced Materials· Volume 32· Issue 43
Publisher page

Abstract

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.
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Research context

OpenAlex topics: 2D Materials and Applications · Perovskite Materials and Applications · Graphene research and applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Materials Science and Engineering Yonsei University Seoul 03722 Korea

Department of Materials Science and Engineering Seoul National University Seoul 08826 Korea

KU‐KIST Graduate School of Converging Science and Technology Korea University Seoul 02841 Korea

Department of Electrical and Computer Engineering University of Minnesota Minneapolis Minnesota 55455 USA

Research Center for Functional Materials National Institute for Materials Science 1‐1 Namiki Tsukuba 305‐0044 Japan

International Center for Materials Nanoarchitectonics National Institute for Materials Science 1‐1 Namiki Tsukuba 305‐0044 Japan

Department of Physics Kyung Hee University Seoul 02447 Korea

Department of Mechanical Engineering Columbia University New York NY 10027 USA

Research Institute of Advanced Materials (RIAM) Institute of Engineering Research Institute of Applied Physics Seoul National University Seoul 08826 Korea

Funding

National Research Foundation · Ministry of Education, Culture, Sports, Science and Technology · Core Research for Evolutional Science and Technology

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