Spatial defects nanoengineering for bipolar conductivity in MoS2

Xiaorui Zheng, Annalisa Calò, Tengfei Cao, Xiangyu Liu, Zhujun Huang, Paul Masih Das, Marija Drndic, Edoardo Albisetti, Francesco Lavini, Tai De Li, Vishal Narang, William P. King, John W. Harrold, Michele Vittadello, Carmela Aruta, Davood Shahrjerdi, Elisa Riedo

Research output: Contribution to journalArticlepeer-review

Abstract

Understanding the atomistic origin of defects in two-dimensional transition metal dichalcogenides, their impact on the electronic properties, and how to control them is critical for future electronics and optoelectronics. Here, we demonstrate the integration of thermochemical scanning probe lithography (tc-SPL) with a flow-through reactive gas cell to achieve nanoscale control of defects in monolayer MoS2. The tc-SPL produced defects can present either p- or n-type doping on demand, depending on the used gasses, allowing the realization of field effect transistors, and p-n junctions with precise sub-μm spatial control, and a rectification ratio of over 104. Doping and defects formation are elucidated by means of X-Ray photoelectron spectroscopy, scanning transmission electron microscopy, and density functional theory. We find that p-type doping in HCl/H2O atmosphere is related to the rearrangement of sulfur atoms, and the formation of protruding covalent S-S bonds on the surface. Alternatively, local heating MoS2 in N2 produces n-character.

Original languageEnglish (US)
Article number3463
JournalNature communications
Volume11
Issue number1
DOIs
StatePublished - Dec 1 2020

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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