Abstract
Pristine and fluorine doped vanadium pentoxide (V2O5) thin films are prepared by spray pyrolysis technique at different molar, dopant concentrations at a substrate temperature of 450 ˚C. The structural, optical, morphological, electrical and ethanol sensor studies are then carried out for these films. The band gap of the prepared host film at 0.03 M concentration has a lowest value of 2.43 eV and the 3 % of F doped V2O5 thin film has a lowest value of 2.39 eV. Morphological studies reveal that the film prepared at 0.03 M and 3 % doped films have good crystallinity. The electrical studies like I-V and Hall measurement on the host film has a conductivity of 245 Ω−1 m−1 and the carrier concentration of 4.74 × 1018 cm−3 where as for the doped film they are 253 Ω−1 m−1 and 7.25 × 1018 cm−3 respectively. Ethanol sensing property of these doped and un-doped V2O5 thin films are then studied. It is observed that F doped V2O5 thin films have higher sensitivity compared to the pure V2O5 thin films.
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