Synthesis of shape and size controlled copper indium diselenide (CuInSe2) via extrusion of selenium from 1,2,3-selenadiazole

Abstract

Extrusion of selenium from cyclohexeno-1,2,3-selenadiazole (SDZ) was successfully utilized for the synthesis of CuInSe₂ nanoparticles. Changes in various reaction parameters such as reaction temperature, concentration of oleic acid (OLA) and various other capping agents showed changes in the physical characteristics of the CISe nanoparticles. The reactions performed at various temperatures resulted in alteration in physical appearance, shape and size of the CISe nanoparticles which was confirmed by XRD, Williamson Hall analysis, particle size analyzer, SEM and TEM analysis. The variation in the amount of OLA only affected the particle size. Optical studies of as-synthesized CISe NPs revealed band gap ranging between 1.1–1.7 eV. HRTEM analysis confirmed the presence of CISe with a variety of shapes and lattice spacings of 0.33 nm corresponding to the (112) crystal plane.