Ultrathin oxysulfide semiconductors from liquid metal: a wet chemical approach

Chung Kim Nguyen, Mei Xian Low, Ali Zavabeti, Azmira Jannat, Billy J. Murdoch, Enrico Della Gaspera, Rebecca Orrell-Trigg, Sumeet Walia, Aaron Elbourne, Vi Khanh Truong, Chris F. McConville, Nitu Syed, Torben Daeneke

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


Metal oxychalcogenides are emerging as a new motif of group VI-A semiconductors with unique electronic properties. Among this family, two dimensional (2D) oxysulfide materials have been increasingly involved in the development of next-gen electronic and optoelectronic devices. However, current synthesis routes for 2D metal oxysulfides are still limited to vapor phase deposition techniques, hindering access to ultra-thin, well-defined, and highly crystalline structures. Herein, we report a new synthesis approach for atomically thin and large-area indium oxysulfide nanosheets (2D In2O3−xSx,xis from 0 to 0.41). The process consists of printing indium oxide skins out of molten indium metal and a subsequent sulfur insertion conducted in a trisulfur radical anion solution. Back-gated field-effect transistors (FETs) based on 2D In2O3−xSxreveal a notably high electron mobility of ∼20.4 cm2V−1s−1, corresponding to approximately 270% mobility enhancement over as-synthesized indium oxide. In addition, 2D In2O3−xSxbased photodetectors exhibit an excellent performance in ultraviolet (UV) region, with a photoresponsivity of ∼3.4 × 103A W−1greatly surpassing that of many commercial materials. More importantly, the same reaction parameters can be employed to obtain 2D bismuth oxysulfide and 2D tin oxysulfide, offering a furnace-free approach for 2D oxysulfide semiconductor fabrication.

Original languageEnglish
Pages (from-to)11815-11826
Number of pages12
JournalJournal of Materials Chemistry C
Issue number35
Publication statusPublished - 21 Sep 2021
Externally publishedYes


  • metal oxychalcogenides
  • VI-A semiconductors
  • optoelectronics
  • oxysulfide semiconductors
  • liquid metal
  • wet chemical
  • Indium tin oxide


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