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Electric-field tunable Type-I to Type-II band alignment transition in MoSe2/WS2 heterobilayers

Author

Listed:
  • Jed Kistner-Morris

    (University of California)

  • Ao Shi

    (University of California)

  • Erfu Liu

    (University of California
    Nanjing University)

  • Trevor Arp

    (University of California
    University of California)

  • Farima Farahmand

    (University of California)

  • Takashi Taniguchi

    (National Institute for Materials Science)

  • Kenji Watanabe

    (National Institute for Materials Science)

  • Vivek Aji

    (University of California)

  • Chun Hung Lui

    (University of California)

  • Nathaniel Gabor

    (University of California)

Abstract

Semiconductor heterojunctions are ubiquitous components of modern electronics. Their properties depend crucially on the band alignment at the interface, which may exhibit straddling gap (type-I), staggered gap (type-II) or broken gap (type-III). The distinct characteristics and applications associated with each alignment make it highly desirable to switch between them within a single material. Here we demonstrate an electrically tunable transition between type-I and type-II band alignments in MoSe2/WS2 heterobilayers by investigating their luminescence and photocurrent characteristics. In their intrinsic state, these heterobilayers exhibit a type-I band alignment, resulting in the dominant intralayer exciton luminescence from MoSe2. However, the application of a strong interlayer electric field induces a transition to a type-II band alignment, leading to pronounced interlayer exciton luminescence. Furthermore, the formation of the interlayer exciton state traps free carriers at the interface, leading to the suppression of interlayer photocurrent and highly nonlinear photocurrent-voltage characteristics. This breakthrough in electrical band alignment control, interlayer exciton manipulation, and carrier trapping heralds a new era of versatile optical and (opto)electronic devices composed of van der Waals heterostructures.

Suggested Citation

  • Jed Kistner-Morris & Ao Shi & Erfu Liu & Trevor Arp & Farima Farahmand & Takashi Taniguchi & Kenji Watanabe & Vivek Aji & Chun Hung Lui & Nathaniel Gabor, 2024. "Electric-field tunable Type-I to Type-II band alignment transition in MoSe2/WS2 heterobilayers," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-48321-1
    DOI: 10.1038/s41467-024-48321-1
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    References listed on IDEAS

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    2. Ting Cao & Gang Wang & Wenpeng Han & Huiqi Ye & Chuanrui Zhu & Junren Shi & Qian Niu & Pingheng Tan & Enge Wang & Baoli Liu & Ji Feng, 2012. "Valley-selective circular dichroism of monolayer molybdenum disulphide," Nature Communications, Nature, vol. 3(1), pages 1-5, January.
    3. A. K. Geim & I. V. Grigorieva, 2013. "Van der Waals heterostructures," Nature, Nature, vol. 499(7459), pages 419-425, July.
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