Red shift of optical band gap in ZnO doped with K synthesized by solution combustion technique

This is a chronicle of the sol-gel auto combustion synthesis of ZnO: K nano grains along with the structural and optical properties. The XRD patterns confirm the substitution of K atoms into ZnO lattice. The grain size, lattice constants and volume are estimated from the XRD patterns. The morphology of the samples are imaged by SEM. The EDAX analysis shows no impurity. The Raman analysis reveals the life time of phonons. The strain and stress induced are detected from Raman analysis. The band gap of the samples estimated from absorption spectra show a red shift for the K doped ZnO.