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

## TL;DR

Researchers developed a scalable method to tune the optical and electronic properties of SnSxSe(2-x) nanosheets by adjusting their composition, enabling optimized performance for various applications.

## Contribution

A scalable, solution-processed route to produce SnSxSe(2-x) alloy nanosheets with tunable optical and electronic properties is introduced.

## Key findings

- The alloy series exhibits a wide range of optical bandgaps from 1.67 eV to 2.46 eV.
- Out-of-plane conductivity shows nonmonotonic behavior with optimal performance at x = 1.2–1.6.
- The tunable properties enable optimized performance in photoelectrochemical applications.

## 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.

A scalable, solution‐processed route unlocks the full SnSxSe(2–x) alloy spectrum, delivering finely tunable optical and electronic properties—from metallic‐like SnSe2 to wide‐bandgap SnS2. Composition‐guided control over in‐ and out‐of‐plane transport enables performance‐optimized photoelectrochemistry, charting a versatile roadmap for designer printable dichalcogenides.