Investigation of the characteristics of the boron doped MnO films deposited by spray pyrolysis method

In this study, the influence of boric acid concentration on the structural and optical properties of sprayed MnO:B films were widely investigated by using different techniques. Boron-doping was achieved by adding 0.1M, 0.2M, 0.3M and 0.4M H3BO3 to the starting solution. The crystal structure of the undoped and boron doped films were determined from x-ray diffraction peaks. The diffraction pattern exhibit peaks at 2θ=28.4098°, 2θ=47.28580 and 2θ=56.0638° were identified to be (111), (220) and (311) planes having cubic structure with lattice parameter, approximetly, a=5.4Å. The band gap of the films were changed from 2.25 to 2.54 eV with boron concentration. The slight decreases in the optical band gap of the films with the increasing boron concentration. The surface morphology of the sprayed undoped and boron doped films were analysed by scanning electron microscopy (SEM).