Thermochemical and kinetic aspects of the sulfurization of Cu-Sb and Cu-Bi thin films

Diego Colombara, Laurence M Peter, Keith D Rogers, Kyle Hutchings

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Abstract

CuSbS2 and Cu3BiS3 are being investigated as part of a search for new absorber materials for photovoltaic devices. Thin films of these chalcogenides were produced by conversion of stacked and co-electroplated metal precursor layers in the presence of elemental sulfur vapour. Ex-situ XRD and SEM/EDS analyses of the processed samples were employed to study the reaction sequence with the aim of achieving compact layer morphologies. A new "Time-Temperature-Reaction" (TTR) diagram and modified Pilling-Bedworth coefficients have been introduced for the description and interpretation of the reaction kinetics. For equal processing times, the minimum temperature required for CuSbS2 to appear is substantially lower than for Cu3BiS3, suggesting that interdiffusion across the interfaces between the binary sulfides is a key step in the formation of the ternary compounds. The effects of the heating rate and sulfur partial pressure on the phase evolution as well as the potential losses of Sb and Bi during the processes have been investigated experimentally and the results related to the equilibrium pressure diagrams obtained via thermochemical computation. 2011 Elsevier Inc. All rights reserved.
LanguageEnglish
Pages36-46
Number of pages11
JournalJournal of Solid State Chemistry
Volume186
DOIs
StatusPublished - Feb 2012

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Sulfur
sulfur
diagrams
absorbers (materials)
Thin films
Chalcogenides
Kinetics
chalcogenides
kinetics
Sulfides
thin films
Heating rate
Reaction kinetics
Partial pressure
partial pressure
sulfides
Energy dispersive spectroscopy
reaction kinetics
Metals
Vapors

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Thermochemical and kinetic aspects of the sulfurization of Cu-Sb and Cu-Bi thin films. / Colombara, Diego; Peter, Laurence M; Rogers, Keith D; Hutchings, Kyle.

In: Journal of Solid State Chemistry, Vol. 186, 02.2012, p. 36-46.

Research output: Contribution to journalArticle

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AB - CuSbS2 and Cu3BiS3 are being investigated as part of a search for new absorber materials for photovoltaic devices. Thin films of these chalcogenides were produced by conversion of stacked and co-electroplated metal precursor layers in the presence of elemental sulfur vapour. Ex-situ XRD and SEM/EDS analyses of the processed samples were employed to study the reaction sequence with the aim of achieving compact layer morphologies. A new "Time-Temperature-Reaction" (TTR) diagram and modified Pilling-Bedworth coefficients have been introduced for the description and interpretation of the reaction kinetics. For equal processing times, the minimum temperature required for CuSbS2 to appear is substantially lower than for Cu3BiS3, suggesting that interdiffusion across the interfaces between the binary sulfides is a key step in the formation of the ternary compounds. The effects of the heating rate and sulfur partial pressure on the phase evolution as well as the potential losses of Sb and Bi during the processes have been investigated experimentally and the results related to the equilibrium pressure diagrams obtained via thermochemical computation. 2011 Elsevier Inc. All rights reserved.

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