Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 9, Issue 9, Pages 3058-3064Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d0tc05121g
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Funding
- Slovenian Research Agency [P2-0412]
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This study investigated the properties of the quasi-binary Bi2Se3-Bi2S3 system over a wide compositional range. It was found that S mainly incorporates into Bi2Se3 through the substitution of Se, leading to the formation of different types of crystals with varying S contents.
We explored the properties of the quasi-binary Bi2Se3-Bi2S3 system over a wide compositional range. X-ray diffraction analysis demonstrates that rhombohedral crystals can be synthesized within the solid solution interval 0-22 mol% Bi2S3, while at 33 mol% Bi2S3 only orthorhombic crystals are obtained. Core level photoemission spectroscopy reveals the presence of Bi3+, Se2- and S2- species and the absence of metallic species, thus indicating that S incorporation into Bi2Se3 proceeds prevalently through the substitution of Se with S. Spin- and angle-resolved photoemission spectroscopy shows that topological surface states develop on the surfaces of the Bi2Se3-ySy (y <= 0.66) rhombohedral crystals, in close analogy with the prototypical case of Bi2Se3, while the orthorhombic crystals with higher S content turn out to be trivial semiconductors. Our results connect unambiguously the phase diagram and electronic properties of the Bi2Se3-Bi2S3 system.
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