Effect of the stacking order, annealing temperature and atmosphere on crystal phase and optical properties of Cu 2 SnS 3 .

Autor: Zaki MY; National Institute of Materials Physics, Atomistilor 405A, 077125, Magurele, Romania., Sava F; National Institute of Materials Physics, Atomistilor 405A, 077125, Magurele, Romania., Simandan ID; National Institute of Materials Physics, Atomistilor 405A, 077125, Magurele, Romania., Buruiana AT; National Institute of Materials Physics, Atomistilor 405A, 077125, Magurele, Romania.; Faculty of Physics, University of Bucharest, Atomistilor 405, 077125, Magurele, Romania., Mihai C; National Institute of Materials Physics, Atomistilor 405A, 077125, Magurele, Romania., Velea A; National Institute of Materials Physics, Atomistilor 405A, 077125, Magurele, Romania. alin.velea@infim.ro., Galca AC; National Institute of Materials Physics, Atomistilor 405A, 077125, Magurele, Romania.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2022 May 13; Vol. 12 (1), pp. 7958. Date of Electronic Publication: 2022 May 13.
DOI: 10.1038/s41598-022-12045-3
Abstrakt: Cu 2 SnS 3 (CTS) is emerging as a promising absorber for the next generation thin film solar cells (TFSC) due to its excellent optical and electronic properties, earth-abundance and eco-friendly elemental composition. In addition, CTS can be used as precursor films for the Cu 2 ZnSnS 4 (CZTS) synthesis. The optical properties of CTS are influenced by stoichiometry, crystalline structure, secondary phases and crystallite size. Routes for obtaining CTS films with optimized properties for TFSC are still being sought. Here, the CTS thin films synthesized by magnetron sputtering on soda lime glass (SLG) using Cu and SnS 2 targets in two different stacks, were studied. The SLG\Cu\SnS 2 and SLG\SnS 2 \Cu stacks were annealed in S and Sn + S atmospheres, at various temperatures. Both stacks show a polymorphic structure, and higher annealing temperatures favor the monoclinic CTS phase formation. Morphology is influenced by the stacking order since a SnS 2 top layer generates several voids on the surface due to the evaporation of SnS, while a Cu top layer provides uniform and void-free surfaces. The films in the copper-capped stack annealed under Sn + S atmosphere have the best structural, morphological, compositional and optical properties, with tunable band gaps between 1.18 and 1.37 eV. Remarkably, secondary phases are present only in a very low percent (< 3.5%) in samples annealed at higher temperatures. This new synthesis strategy opens the way for obtaining CTS thin films for solar cell applications, that can be used also as intermediary stage for CZTS synthesis.
(© 2022. The Author(s).)
Databáze: MEDLINE
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