NANOFIBERS IN CdTe: IODINE THIN FILMS BY SPRAY DEPOSITION
Cadmium Telluride: Iodine nanoparticle thin films were prepared by spraying iodine doped CdTe nanoparticles dispersed in 1-Butanol, on the glass substrates kept at 200°C for 20 min. Iodine doped CdTe nanoparticles had been prepared by adding trace amounts of Iodine powder in addition to stoichiometric ratios of Cd and Te in the Solvothermal synthesis. The films were prepared by applying without a voltage and with a voltage of 700 V to the nozzle during the deposition. The presence of iodine in the films was confirmed by the sign of voltage generated (positive relative to the cold end) in the hot probe method and also from the elemental analysis using X-ray Photoelectron Spectroscopy. X-ray diffraction patterns of the films showed predominantly Hexagonal CdTe peaks in both the cases. From the transmission spectra of the films the bandgap was found to be 1.77 eV against the bulk CdTe bandgap of 1.5 eV. The band edge was not as sharp as compared to that in case of the undoped films. SEM and TEM micrographs of both the films revealed the formation of Nanofibers.