2017
DOI: 10.1007/s10854-017-7935-x
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Investigation of sensing properties of sol–gel processed 4 at%Sb:SnO2/TiO2 thin films

Abstract: In this work we investigate the gas and photo sensing properties of the antimony doped tin oxide and titanium oxide (4 at%Sb:SnO 2 /TiO 2 ) nanocrystalline thin films deposited by sol-gel dip-coating. Photoconductivity measurements are carried out under solar light spectra irradiation at different powers. These results show a photo sensitivity of the films in a lateral junction due to interfacial defects. Gas sensitivity was studied at different pressures, and higher conductivity is presented at lower pressure… Show more

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Cited by 5 publications
(3 citation statements)
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“…4(b) yields the value of (E cap -) = 78 ± 11 meV. The temperature range (240-300 K) for the evaluation of photo-induced decay parameters is in good agreement with previous publications [20,34,35]. For a wider range, other defects may become relevant for the trapping process and compete for electron capture, leading to the overlap of the decay curves, as observed.…”
Section: Resultssupporting
confidence: 88%
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“…4(b) yields the value of (E cap -) = 78 ± 11 meV. The temperature range (240-300 K) for the evaluation of photo-induced decay parameters is in good agreement with previous publications [20,34,35]. For a wider range, other defects may become relevant for the trapping process and compete for electron capture, leading to the overlap of the decay curves, as observed.…”
Section: Resultssupporting
confidence: 88%
“…After the abrupt current fall in the first seconds, the current decay becomes slower in all the three atmospheres. This abrupt decaying current rate did not occur in sole TiO 2 film measured under similar conditions as reported in a previous work [35], which implies that the interface between TiO 2 and Sb:SnO 2 of the heterostructure is contributing to the higher gas-sensing on the sample. Under excitation, the gas-adsorption improvement on the TiO 2 surface may occur due to the increase of electrons in the TiO 2 layer coming from excitation and from the SnO 2 layer.…”
Section: Resultssupporting
confidence: 85%
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