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Synthesis of In 2 S 3 and In 6 S 7 Microcolumns and Nanowires by a Vapor‐Solid Method
Author(s) -
Bartolomé Javier,
Maestre David,
Cremades Ana
Publication year - 2018
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201800261
Subject(s) - nanowire , materials science , x ray photoelectron spectroscopy , indium , evaporation , spectroscopy , deposition (geology) , chemical vapor deposition , solar cell , analytical chemistry (journal) , semiconductor , nanotechnology , optoelectronics , chemical engineering , chemistry , paleontology , physics , chromatography , quantum mechanics , sediment , biology , engineering , thermodynamics
Indium sulfide (In 2 S 3 ) is a promising candidate for the replacement of CdS buffer layers in solar cell devices, while hexaindium heptasulfide (In 6 S 7 ) presents interesting properties for its use as absorber material. In this work the fabrication of In 2 S 3 microcolumns as well as novel In 6 S 7 nanowires with diameters of about 70–120 nm is reported. The structures are grown following a thermal evaporation‐deposition method at temperatures between 900 and 1000 °C. Control of the phase and morphology of the structures is achieved through both the evaporation and deposition temperatures, which can be tuned separately. Energy dispersive spectroscopy shows no traces of residual oxygen, while X‐ray photoelectron spectroscopy indicates the presence of small amounts of oxygen incorporated at the surface of the structures. The In 6 S 7 nanowires are found to be degenerated n‐type semiconductors, with the Fermi level above the conduction band minimum. The origin of this n‐type degeneracy is discussed in terms of S vacancies.

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