Study of Size Distribution in Chalcopyrite Copper Indium (Di)selenide Nanoparticles

The copper indium diselenide compound (CuInSe2) belongs to the I-III-VI2 group and possesses a direct band gap. It was grown by a solvo-thermal process. In the present work, chalcopyrite CuInSe2 nanocrystalline particles were synthesized by using as starting precursors salts of In (III) and Cu (II). As-grown nanoparticles, were then characterized via powder X-ray diffraction (XRD), transmission electron microscope (TEM) and UV-VIS spectroscopy. Structural analysis done by powder X-ray diffraction reveal that CuInSe 2 nanocrystalline possess a tetragonally chalcopyrite structure. The microstructure analysis of the obtained product was done by transmission electron microscopy. The tunable optical properties and the bandgap of as grown material were studied by UV-Vis spectrometer. Finally, the effective mass approximation model was used to calculate the particle size from the effective band-gap energies.