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Redox-governed charge doping dictated by interfacial diffusion in two-dimensional materials

Author

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  • Kwanghee Park

    (Pohang University of Science and Technology (POSTECH))

  • Haneul Kang

    (Pohang University of Science and Technology (POSTECH))

  • Seonghyun Koo

    (Pohang University of Science and Technology (POSTECH))

  • DaeEung Lee

    (Kyung Hee University)

  • Sunmin Ryu

    (Pohang University of Science and Technology (POSTECH)
    Pohang University of Science and Technology (POSTECH))

Abstract

Controlling extra charge carriers is pivotal in manipulating electronic, optical, and magnetic properties of various two-dimensional materials. Nonetheless, the ubiquitous hole doping of two-dimensional materials in the air and acids has been controversial in its mechanistic details. Here we show their common origin is an electrochemical reaction driven by redox couples of oxygen and water molecules. Using real-time photoluminescence imaging of WS2 and Raman spectroscopy of graphene, we capture molecular diffusion through the two-dimensional nanoscopic space between two-dimensional materials and hydrophilic substrates, and show that the latter accommodate water molecules also serving as a hydrating solvent. We also demonstrate that HCl-induced doping is governed by dissolved O2 and pH in accordance with the Nernst equation. The nanoscopic electrochemistry anatomized in this work sets an ambient limit to material properties, which is universal to not only 2D but also other forms of materials.

Suggested Citation

  • Kwanghee Park & Haneul Kang & Seonghyun Koo & DaeEung Lee & Sunmin Ryu, 2019. "Redox-governed charge doping dictated by interfacial diffusion in two-dimensional materials," Nature Communications, Nature, vol. 10(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-12819-w
    DOI: 10.1038/s41467-019-12819-w
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    Cited by:

    1. Dogyeong Kim & Sol Lee & Jiwon Park & Jinho Lee & Hee Cheul Choi & Kwanpyo Kim & Sunmin Ryu, 2023. "In-plane and out-of-plane excitonic coupling in 2D molecular crystals," Nature Communications, Nature, vol. 14(1), pages 1-9, December.

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