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Solution Processed Fabrication of Se–Te Alloy Thin Films for Application in PV Devices

Cite this: ACS Appl. Energy Mater. 2022, 5, 3, 3275–3281
Publication Date (Web):March 14, 2022
https://doi.org/10.1021/acsaem.1c03896
Copyright © 2022 American Chemical Society

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    Abstract

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    In this work, we report the first-ever fabrication of solution-processed Se–Te alloy thin films for photovoltaic applications using an amine–thiol solvent system. By controlling the relative quantity of Se and Te in ethylenediamine–ethanethiol (EN–ET) solution mixtures, films with different Se/Te ratios were fabricated at temperatures as low as 200 °C with phase-pure material synthesis and uniform homogenous alloying. These composition variations then successfully demonstrated band gap variation from 1.80 eV for pure Se to 1.18 eV for a film with 60% Se and 40% Te that closely matches the theoretical values calculated from Vegard’s law for these materials. Using the evaporation process, the isolation of chalcogen complexes from the EN–ET solution was performed, which was followed by the addition of foreign solvents like dimethyl sulfoxide, dimethyl formamide, and ethanolamine, which enabled the fabrication of better quality films using the spin coating process, minimizing the porosity and increasing the uniformity of the film. A preliminary device fabricated from these films showed diode characteristics with encouraging photovoltaic performance (a power conversion efficiency of 1.11%) that demands further optimization with film fabrication, selection of device architecture, and detailed defect analysis for this material.

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    The Supporting Information is available free of charge at https://pubs.acs.org/doi/10.1021/acsaem.1c03896.

    • XRF and SEM data, composition of films annealed at different temperatures, images of films annealed at different temperatures, and absorption data obtained from UV-vis spectroscopy (PDF)

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    Cited By

    This article is cited by 6 publications.

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    2. Roman Svoboda, Jan Prikryl, Pavel Provotorov, Alexander V. Kolobov, Milos Krbal. Crystal Growth in Se–Te Chalcogenides: Overview of the Growth/Relaxation/Viscosity Interplay for Bulk Glasses and Thin Films. Crystal Growth & Design 2023, 23 (1) , 216-228. https://doi.org/10.1021/acs.cgd.2c00934
    3. Takaya Kawagishi, Yusuke Adachi, Taizo Kobayashi. Photovoltaic performances of TiO2/Se heterojunction devices with different crystallographic structures of sputter-deposited TiO2 thin films. Materials Chemistry and Physics 2023, 297 , 127371. https://doi.org/10.1016/j.matchemphys.2023.127371
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    5. Roman Svoboda, Jan Prikryl, Pavel Provotorov, Alexander V. Kolobov, Milos Krbal. Next-gen approach to the combined micro/macro-scopic measurements of crystal growth in chalcogenide thin films: The case of Se90Te10. Journal of Alloys and Compounds 2022, 923 , 166389. https://doi.org/10.1016/j.jallcom.2022.166389
    6. David B. Mitzi, Yongshin Kim. Spiers Memorial Lecture: Next generation chalcogenide-based absorbers for thin-film solar cells. Faraday Discussions 2022, 239 , 9-37. https://doi.org/10.1039/D2FD00132B