Effect of (Mn-Co) co-doping on the structural, morphological, optical, photoluminescence and electrical properties of SnO2

Mn and Mn-Co doped SnO2 have been successfully synthesized using co-precipitation technique. The structural properties and surface morphology were studied using x-ray diffractometer (XRD) and scanning electron microscopy (SEM) respectively. Composition analysis of the samples has been carried out from EDX data. Optical properties were studied using reflectance spectroscopy in the wavelength range 200 nm-800 nm and IR absorption spectroscopy in the wave number range 400 cm−1-4000 cm−1. Reflectance spectra revealed that the band gap of prepared samples changes with doping concentration and found to be in the range 3.91 eV-3.95 eV. Infrared (IR) absorption spectra describe the different mode of band related to a functional group present in the materials. Mn and Mn-Co doped SnO2 exhibit very strong emission near the wavelength 413 nm and 434 nm. DC resistivity measurement shows that the activation energy increases with increasing concentration of dopant.