Issue 35, 2021

Ultrathin oxysulfide semiconductors from liquid metal: a wet chemical approach

Abstract

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, x is 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−xSx reveal a notably high electron mobility of ∼20.4 cm2 V−1 s−1, corresponding to approximately 270% mobility enhancement over as-synthesized indium oxide. In addition, 2D In2O3−xSx based photodetectors exhibit an excellent performance in ultraviolet (UV) region, with a photoresponsivity of ∼3.4 × 103 A W−1 greatly 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.

Graphical abstract: Ultrathin oxysulfide semiconductors from liquid metal: a wet chemical approach

Supplementary files

Article information

Article type
Paper
Submitted
27 apr 2021
Accepted
28 jun 2021
First published
29 jun 2021

J. Mater. Chem. C, 2021,9, 11815-11826

Ultrathin oxysulfide semiconductors from liquid metal: a wet chemical approach

C. K. Nguyen, M. X. Low, A. Zavabeti, A. Jannat, B. J. Murdoch, E. Della Gaspera, R. Orrell-Trigg, S. Walia, A. Elbourne, V. K. Truong, C. F. McConville, N. Syed and T. Daeneke, J. Mater. Chem. C, 2021, 9, 11815 DOI: 10.1039/D1TC01937F

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