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SnO2 Films Deposited by Ultrasonic Spray Pyrolysis: Influence of Al Incorporation on the Properties

Deyu, Getnet Kacha and Muñoz-Rojas, David and Rapenne, Laetitia and Deschanvres, Jean-Luc and Klein, Andreas and Jiménez, Carmen and Bellet, Daniel (2019):
SnO2 Films Deposited by Ultrasonic Spray Pyrolysis: Influence of Al Incorporation on the Properties.
In: Molecules, (15), 24. MDPI, e-ISSN 1420-3049,
DOI: 10.25534/tuprints-00009683,
[Online-Edition: https://tuprints.ulb.tu-darmstadt.de/9683],
Secondary publishing via sponsored Golden Open Access, [Article]

Abstract

Aluminum-doped tin oxide (SnO 2 :Al) thin films were produced by an ultrasonic spray pyrolysis method. The effect of aluminum doping on structural, optical, and electrical properties of tin oxide thin films synthesized at 420 ∘ C was investigated. Al doping induced a change in the morphology of tin oxide films and yielded films with smaller grain size. SnO 2 thin films undergo a structural reordering and have a texture transition from (301) to (101), and then to (002) preferred cristallographic orientation upon Al doping. The lattice parameters (a and c) decreases with Al doping, following in a first approximation Vegard’s law. The optical transmission does not change in the visible region with an average transmittance value of 72–81%. Conversely, in the near infrared (NIR) region, the plasmon frequency shifts towards the IR region upon increasing Al concentration in the grown films. Nominally undoped SnO 2 have a conductivity of ∼1120 S/cm, which is at least two orders of magnitude larger than what is reported in literature. This higher conductivity is attributed to the Cl − ions in the SnCl 4 ·5(H 2 O) precursor, which would act as donor dopants. The introduction of Al into the SnO 2 lattice showed a decrease of the electrical conductivity of SnO 2 due to compensating hole generation. These findings will be useful for further studied tackling the tailoring of the properties of highly demanded fluorine doped tin oxide (FTO) films.

Item Type: Article
Erschienen: 2019
Creators: Deyu, Getnet Kacha and Muñoz-Rojas, David and Rapenne, Laetitia and Deschanvres, Jean-Luc and Klein, Andreas and Jiménez, Carmen and Bellet, Daniel
Title: SnO2 Films Deposited by Ultrasonic Spray Pyrolysis: Influence of Al Incorporation on the Properties
Language: English
Abstract:

Aluminum-doped tin oxide (SnO 2 :Al) thin films were produced by an ultrasonic spray pyrolysis method. The effect of aluminum doping on structural, optical, and electrical properties of tin oxide thin films synthesized at 420 ∘ C was investigated. Al doping induced a change in the morphology of tin oxide films and yielded films with smaller grain size. SnO 2 thin films undergo a structural reordering and have a texture transition from (301) to (101), and then to (002) preferred cristallographic orientation upon Al doping. The lattice parameters (a and c) decreases with Al doping, following in a first approximation Vegard’s law. The optical transmission does not change in the visible region with an average transmittance value of 72–81%. Conversely, in the near infrared (NIR) region, the plasmon frequency shifts towards the IR region upon increasing Al concentration in the grown films. Nominally undoped SnO 2 have a conductivity of ∼1120 S/cm, which is at least two orders of magnitude larger than what is reported in literature. This higher conductivity is attributed to the Cl − ions in the SnCl 4 ·5(H 2 O) precursor, which would act as donor dopants. The introduction of Al into the SnO 2 lattice showed a decrease of the electrical conductivity of SnO 2 due to compensating hole generation. These findings will be useful for further studied tackling the tailoring of the properties of highly demanded fluorine doped tin oxide (FTO) films.

Journal or Publication Title: Molecules
Number: 15
Publisher: MDPI
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Surface Science
Date Deposited: 15 Dec 2019 20:56
DOI: 10.25534/tuprints-00009683
Official URL: https://tuprints.ulb.tu-darmstadt.de/9683
URN: urn:nbn:de:tuda-tuprints-96830
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