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Van der Waals SnSe2(1-x)S2x alloys: composition-dependent bowing coefficient and electron-phonon interaction

Kudrynskyi, Zakhar R.; Wang, Xueting; Sutcliffe, Jake; Bhuiyan, Mahabub A.; Fu, Yuhao; Yang, Zhuo; Makarovsky, Oleg; Eaves, Laurence; Solomon, Andrij; Maslyuk, Volodymyr T.; Kovalyuk, Zakhar D.; Zhang, Lijun; Patanè, Amalia

Authors

Xueting Wang

Jake Sutcliffe

Mahabub A. Bhuiyan

Yuhao Fu

Zhuo Yang

Andrij Solomon

Volodymyr T. Maslyuk

Zakhar D. Kovalyuk

Lijun Zhang lijun_zhang@jlu.edu.cn



Abstract

The design of advanced functional materials with customized properties often requires the use of an alloy. This approach has been used for decades, but only recently to create van der Waals (vdW) alloys for applications in electronics, optoelectronics, and thermoelectrics. A route to engineering their physical properties is by mixing isoelectronic elements, as done for the SnSe2(1−x)S2x alloy. Here, by experiment and first‐principles modeling, it is shown that the value of x can be adjusted over a wide range, indicating good miscibility of the SnS2 and SnSe2 compounds. The x‐dependence of the indirect bandgap energy from Eind = 1.20 eV for SnSe2 to Eind = 2.14 eV for SnS2, corresponds to a large bowing coefficient b ≈ 1 eV, arising from volume deformation and charge exchange effects due to the different sizes and orbital energies of the S‐ and Se‐atoms. This also causes composition‐dependent phonon energy modes, electron–phonon interaction, and temperature dependence of Eind. The alloys are exfoliable into thin layers with properties that depend on the composition, but only weakly on the layer thickness. This work shows that the electronic and vibrational properties of the SnSe2(1−x)S2x alloy and its thin layers provide a versatile platform for development and exploitation.

Journal Article Type Article
Publication Date Feb 26, 2020
Journal Advanced Functional Materials
Print ISSN 1616-301X
Electronic ISSN 1616-3028
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 30
Issue 9
Article Number 1908092
APA6 Citation Kudrynskyi, Z. R., Wang, X., Sutcliffe, J., Bhuiyan, M. A., Fu, Y., Yang, Z., …Patanè, A. (2020). Van der Waals SnSe2(1-x)S2x alloys: composition-dependent bowing coefficient and electron-phonon interaction. Advanced Functional Materials, 30(9), https://doi.org/10.1002/adfm.201908092
DOI https://doi.org/10.1002/adfm.201908092
Keywords SnSe2(1-x)S2x; semiconducting alloys; van der Waals crystals; electron-phonon interaction
Publisher URL https://onlinelibrary.wiley.com/doi/full/10.1002/adfm.201908092
Additional Information Received: 2019-09-30; Published: 2020-01-09

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