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Composition-Dependent Wide-Range Tunability of Optical and Electronic Properties in SnSxSe(2-x) Alloy Nanosheets

Journal Article (2026)
Author(s)

Nicolas J. Diercks (École Polytechnique Fédérale de Lausanne)

Rebekah A. Wells (Trinity College Dublin)

Shixin Liu (Trinity College Dublin)

Tian Carey (Trinity College Dublin)

Jack Doran (Trinity College Dublin)

Joseph Neilson (Trinity College Dublin)

YeonJu Kim (École Polytechnique Fédérale de Lausanne)

Jun-Ho Yum (École Polytechnique Fédérale de Lausanne)

Goutam Ghosh (TU Delft - Applied Sciences)

Hannah Johnson (Toyota Motor Europe, École Polytechnique Fédérale de Lausanne)

Laurens D.A. Siebbeles (TU Delft - Applied Sciences)

Jonathan N. Coleman (Trinity College Dublin)

Kevin Sivula (École Polytechnique Fédérale de Lausanne)

Research Group
ChemE/Opto-electronic Materials
DOI related publication
https://doi.org/10.1002/smll.202512066 Final published version
More Info
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Publication Year
2026
Language
English
Research Group
ChemE/Opto-electronic Materials
Journal title
Small
Issue number
11
Volume number
22
Article number
e12066
Downloads counter
49
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Abstract

Isovalent alloying in printable metal dichalcogenide nanomaterials enables precise, application-targeted property tuning. However, a scalable platform offering broad optical and electrical tunability has so far remained elusive. Herein, we establish a powder-based, solution-processed route to access the full domain of SnSxSe(2-x) alloy nanosheets, providing control over a wide range of properties through chalcogenide composition. The n-type nanosheet alloy series shows a wide spread in optical and in-plane electrical properties, ranging from 1.67 eV and low bandgap metallic-like behavior for 2D SnSe2, to 2.46 eV and wide bandgap semiconducting behavior with high-resistivity for 2D SnS2. The out-of-plane conductivity is also tunable, showing nonmonotonic behavior with an optimal chalcogenide ratio of x = 1.2 – 1.6. Using photoelectrochemistry as an example, we highlight how the interplay of these tunable properties enables optimized performance for targeted applications. The exceptional range of tailorable properties reported here provides a roadmap for tuning these alloys, thereby opening avenues for their potential application in a multitude of fields.