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Investigating the Local Bonding Structure of Amorphous Zinc Tin Oxide to Elucidate the Effect of Altering the Intercation Ratio

Callaghan, Peter J. ; Fleischer, Karsten ; Caffrey, David ; Zhussupbekov, Kuanysh ; Ansell, Stuart LU ; Gun’ko, Yurii K. ; Shvets, Igor V. and Zhussupbekova, Ainur (2024) In Journal of Physical Chemistry C 128(39). p.16733-16739
Abstract

In this paper, the local bonding structure in amorphous zinc tin oxide (a-ZTO) is probed using a combination of XANES and EXAFS techniques at the Zn and Sn K-edges to gain insight into charge carrier generation in the material. a-ZTO is prepared using two growth methods; spray pyrolysis and magnetron sputtering. It is seen that a-ZTO grown by magnetron sputtering shows no changes in the chemical environment as the cation ratio is varied; meanwhile, XANES analysis of spray pyrolysis grown samples shows alterations to spectra likely due to the effects caused by different precursors. Although a slight shift in Sn-O bond length is visible between magnetron sputtered and spray grown samples, no correlation could be discerned between bond... (More)

In this paper, the local bonding structure in amorphous zinc tin oxide (a-ZTO) is probed using a combination of XANES and EXAFS techniques at the Zn and Sn K-edges to gain insight into charge carrier generation in the material. a-ZTO is prepared using two growth methods; spray pyrolysis and magnetron sputtering. It is seen that a-ZTO grown by magnetron sputtering shows no changes in the chemical environment as the cation ratio is varied; meanwhile, XANES analysis of spray pyrolysis grown samples shows alterations to spectra likely due to the effects caused by different precursors. Although a slight shift in Sn-O bond length is visible between magnetron sputtered and spray grown samples, no correlation could be discerned between bond length and variation in cation ratio. It is concluded that a-ZTO, while amorphous over longer ranges, is locally composed of ZnO and SnO2 “building blocks”. An alteration in the cation ratio changes the hybridization at the conduction band minimum, resulting in the observed variation in the mobility, charge carrier concentration, and bandgap.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Physical Chemistry C
volume
128
issue
39
pages
7 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • pmid:39380974
  • scopus:85204601021
ISSN
1932-7447
DOI
10.1021/acs.jpcc.4c04225
language
English
LU publication?
yes
id
8f71b273-02ed-4e0c-9270-b3dbba914a18
date added to LUP
2024-11-27 11:45:31
date last changed
2025-07-10 06:29:25
@article{8f71b273-02ed-4e0c-9270-b3dbba914a18,
  abstract     = {{<p>In this paper, the local bonding structure in amorphous zinc tin oxide (a-ZTO) is probed using a combination of XANES and EXAFS techniques at the Zn and Sn K-edges to gain insight into charge carrier generation in the material. a-ZTO is prepared using two growth methods; spray pyrolysis and magnetron sputtering. It is seen that a-ZTO grown by magnetron sputtering shows no changes in the chemical environment as the cation ratio is varied; meanwhile, XANES analysis of spray pyrolysis grown samples shows alterations to spectra likely due to the effects caused by different precursors. Although a slight shift in Sn-O bond length is visible between magnetron sputtered and spray grown samples, no correlation could be discerned between bond length and variation in cation ratio. It is concluded that a-ZTO, while amorphous over longer ranges, is locally composed of ZnO and SnO<sub>2</sub> “building blocks”. An alteration in the cation ratio changes the hybridization at the conduction band minimum, resulting in the observed variation in the mobility, charge carrier concentration, and bandgap.</p>}},
  author       = {{Callaghan, Peter J. and Fleischer, Karsten and Caffrey, David and Zhussupbekov, Kuanysh and Ansell, Stuart and Gun’ko, Yurii K. and Shvets, Igor V. and Zhussupbekova, Ainur}},
  issn         = {{1932-7447}},
  language     = {{eng}},
  number       = {{39}},
  pages        = {{16733--16739}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{Journal of Physical Chemistry C}},
  title        = {{Investigating the Local Bonding Structure of Amorphous Zinc Tin Oxide to Elucidate the Effect of Altering the Intercation Ratio}},
  url          = {{http://dx.doi.org/10.1021/acs.jpcc.4c04225}},
  doi          = {{10.1021/acs.jpcc.4c04225}},
  volume       = {{128}},
  year         = {{2024}},
}