Abstract
Zinc stannate (ZTO) is considered as potentially transparent semiconducting material due to high visible transparency and electrical conductivity for transparent electronics and barrier layers. In the present work, the structure-property relationship for spin coated Zn2-xCaxSnO4 (0.0 ≤ x ≤ 0.2) nanostructured films using acetylacetone as sol gel precursor solvent was investigated. The crystal structure, molecular structure, surface morphology, chemical state, optical and electrical properties were evaluated. X-ray diffraction study confirms polycrystalline films with inverse spinel structure. The formation of additional vibrational modes in the Raman spectra confirms Ca dopant incorporation in ZTO system. X-ray photoelectron spectroscopy spectra show an enhancement in oxygen vacancy contribution and Sn2+ contributions as compared to otherwise stable Sn4+ state with Ca content. An improved average optical transparency (81.9%) in visible spectrum along with highest carrier concentration (3.7 × 1020 cm−3) gives maximum Haache's figure of merit value of 1.45 × 10−4/Ω for sol-gel derived Zn1·95Ca0·05SnO4 nanostructured films, confirms its suitability as transparent conductor.
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