Controlling 2D/2D Contacts in 2D TMDC Nanostructured Films for Solar-to-Hydrogen Conversion

Andrea Balocchi, Lucianna Da Gama Fernandes Vieira, Giovanna Formiga Franklin, Pierre Louis Taberna, Antoine Barnabe, Marc Vedrenne, Xavier Marie, Sefaattin Tongay, Jean Yves Chane-Ching

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


With the objective to achieve high-performance photoactive 2D films, a variety of large-surface-area, nanostructured films composed of 2D transition metal dichalcogenides (TMDCs) building blocks was successfully self-assembled using a customized, surface-functionalized, metallic sulfide template. Since 2D/2D contacts in these nanostructured films were anticipated to play a crucial role in charge carrier transport properties, control of 2D/2D contact properties was explored by varying 2D building block sizes and film-forming processes. High-resolution transmission electron microscopy (HRTEM) deep characterization of morphological properties of 2D/2D contacts using focused ion beam (FIB) cross-sections reveals a variety of contact configurations mainly depending on the 2D building block thickness. Particularly, the effects of nanostructuration on 2D/2D contact characteristics such as the contact density, plane/plane vs edge/plane contact ratio, and contact boundary angles are clearly demonstrated on a large range of MoS2, WS2 and WSe2 building blocks varying from monolayers to nanoflakes, displaying various thicknesses. Correlations with electrical and photoelectrochemical properties demonstrate that the 2D/2D contact surface area, 2D/2D contact density, and contact boundary angles are key parameters controlling the recombination of photogenerated carriers. These findings are validated both on p-WSe2 and p-WS2 nanostructured films with photocurrents up to 4.5 mA cm-2 for the photoelectrochemical decomposition of H2O.

Original languageEnglish (US)
Pages (from-to)734-744
Number of pages11
JournalACS Applied Energy Materials
Issue number2
StatePublished - Jan 23 2023


  • 2D materials
  • 2D/2D contacts
  • WS
  • hydrogen
  • photoelectrochemical conversion

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Energy Engineering and Power Technology
  • Electrochemistry
  • Materials Chemistry
  • Electrical and Electronic Engineering


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