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Sinha, Nidhi
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article
Dielectric studies and band gap tuning of ferroelectric Cr-doped ZnO nanorods
Abstract
<jats:p>Effect of Cr-doping on the optical behavior of ZnO nanorods (NRs) (size: diameter ∼ 40 nm and length ∼ 400 nm) is reported. Significant red shift of 18 nm was observed in UV-Vis studies, i.e., a band gap tuning is achieved by Cr doping. In photoluminescence studies, a very remarkable blue shift of 16 nm in green emission was observed. Significant shifts in various modes of Raman spectra of Cr-doped ZnO nanorods are observed in low and high wavenumber region, along with appearance and disappearance of other peaks. The results suggest that Cr-doping can affect the defects and oxygen vacancies in ZnO nanomaterials giving the possibility of fine band gap tuning for tailor made applications of nano-optoelectronics devices. A very high dielectric constant (950) at low frequency side and ferroelectric phase transition (69 °C) were found for Cr-doped ZnO NR, which make it suitable for charge storage and nanoscale memory devices.</jats:p>