A dielectric-defined lateral heterojunction in a monolayer semiconductor

M. Iqbal Bakti Utama, Hans Kleemann, Wenyu Zhao, Chin Shen Ong, Felipe H. da Jornada, Diana Y. Qiu, Hui Cai, Han Li, Rai Kou, Sihan Zhao, Sheng Wang, Kenji Watanabe, Takashi Taniguchi, Sefaattin Tongay, Alex Zettl, Steven G. Louie, Feng Wang

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

Owing to their low dimensionality, two-dimensional semiconductors, such as monolayer molybdenum disulfide, have a range of properties that make them valuable in the development of nanoelectronics. For example, the electronic bandgap of these semiconductors is not an intrinsic physical parameter and can be engineered by manipulating the dielectric environment around the monolayer. Here we show that this dielectric-dependent electronic bandgap can be used to engineer a lateral heterojunction within a homogeneous MoS 2 monolayer. We visualize the heterostructure with Kelvin probe force microscopy and examine its influence on electrical transport experimentally and theoretically. We observe a lateral heterojunction with an approximately 90 meV band offset due to the differing degrees of bandgap renormalization of monolayer MoS 2 when it is placed on a substrate in which one segment is made from an amorphous fluoropolymer (Cytop) and another segment is made of hexagonal boron nitride. This heterostructure leads to a diode-like electrical transport with a strong asymmetric behaviour.

Original languageEnglish (US)
Pages (from-to)60-65
Number of pages6
JournalNature Electronics
Volume2
Issue number2
DOIs
StatePublished - Feb 1 2019

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Instrumentation
  • Electrical and Electronic Engineering

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  • Cite this

    Utama, M. I. B., Kleemann, H., Zhao, W., Ong, C. S., da Jornada, F. H., Qiu, D. Y., Cai, H., Li, H., Kou, R., Zhao, S., Wang, S., Watanabe, K., Taniguchi, T., Tongay, S., Zettl, A., Louie, S. G., & Wang, F. (2019). A dielectric-defined lateral heterojunction in a monolayer semiconductor. Nature Electronics, 2(2), 60-65. https://doi.org/10.1038/s41928-019-0207-4