Investigations on the structural and optical properties of sphere-shaped indium nitride (InN)

Indium nitride (InN) sphere-shaped micro crystals and nano crystals were made using sol–gel method. The crystalline size of the samples were calculated using X-ray diffraction, which were found to increase with the increase of nitridation temperature and time. High resolution-transmission electron microscopy images exhibited the distinct sphere shape of InN with different size of micro and nanometers. The calculated band gap of InN spheres using photo luminescence and UV–visible absorption spectra, was found to be 1.2 eV. Optical phonon modes of InN were determined from micro-Raman studies.