Investigation of spatially localized defects in synthetic WS2 monolayers

Bárbara L.T. Rosa, Kazunori Fujisawa, Joyce C.C. Santos, Tianyi Zhang, Matheus J.S. Matos, Frederico B. Sousa, Tiago C. Barbosa, Lucas Lafeta, Sérgio L.L.M. Ramos, Bruno R. Carvalho, Helio Chacham, Bernardo R.A. Neves, Mauricio Terrones, Leandro M. Malard

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

While the spatially nonhomogeneous light emission from synthetic WS2 monolayers is frequently reported in the literature, the nature of this phenomenon still requires thoughtful investigation. Here, we combine several characterization techniques (optical imaging, scanning probe and electron microscopy) along with density functional theory to investigate the presence of substitutional doping localized at narrow regions along the S zigzag edge of WS2 monolayers. We verified that photoluminescence quenching along narrow regions is not related to grain boundaries but to substitutional impurities of lighter metals at the W sites, which modify the radiative and nonradiative decay channels. We also found potential candidates for occupying the W site through ADF-STEM analysis and discussed their impact on photoluminescence quenching by performing density functional theory calculations. Our findings shed light on how atomic defects introduced during WS2 monolayer's synthesis impact the crystalline quality and, therefore, the development of high-performance optoelectronic devices based on semiconducting 2D materials.

Original languageEnglish (US)
Article number115301
JournalPhysical Review B
Volume106
Issue number11
DOIs
StatePublished - Sep 15 2022

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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