Solvothermal Preparation and Spectroscopic Characterization of Copper Indium Diselenide Nanorods

Abstract

Single-crystalline chalcopyrite CuInSe(2) nanorods (CuInSe(2)NRs) of 50-100 nm in diameter and up to a few micrometers in length have been synthesized solvothermally. High-resolution transmission electron microscopic images of the CuInSe(2)NRs reveal the d-spacing of 0.335 nm for the (112) crystalline planes and a growth direction along [331]. The near-infrared absorption spectrum of the chalcopyrite CuInSe(2)NRs shows a peak maximum at 1162 nm and an onset at 1262 nm, indicating no apparent blue-shift compared with those of Cu-rich CuInSe(2) thin films. An intense peak at 175.1 cm(-1) in the room-temperature Raman scattering spectrum of CuInSe(2)NRs corresponds to the A(1) phonon mode of tetragonal CuInSe(2) chalcopyrite. The narrower full width at half-maximum (fwhm) of 9.5 cm(-1) for CuInSe(2)NRs, in comparison with fwhm approximately 12 cm(-1) for CuInSe(2) films, indicates a uniform size distribution and single crystallization in the nanorods. Analysis of the photoluminescence from the single-crystalline CuInSe(2)NRs measured at 10 K has categorized the emission into seven groups of transitions as characterized by free excitons, bound excitons, conduction band to acceptor levels, and bound excitons at different defects.

Shape-controlled synthesis and optical characterization of chalcopyrite CuInS2 microstructures

“…As displayed in Fig. 4, all the spectra show characteristic and well-defined excitation absorption peaks of CuInS 2 , which are similar to previously reported results [26]. The inset shows the band gap of the CuInS 2 samples is estimated from their plots of (ahn) 2 vs. hn [5], which were derived from their corresponding UV-vis diffuse reflectance spectra (Fig.…”

CuInSe2 nano-crystallite reaction kinetics using solid state reaction from Cu2Se and In2Se3 powders

“…Therefore, developing colloidal routes, such as spin-casting or printing, to fabricate CIS thin film solar cells that have well controlled stoichiometry, high materials utilization and low processing equipment cost have attracted much attention [3]. CuInSe 2 (CIS) powder has been reported successfully synthesized using solid-state reaction [4][5][6][7][8], solvo-thermal [9][10][11][12], thermolysis [13] and thermal decomposition methods [14][15][16][17]. Compared to the liquid-phase process, the solid state reaction is much easier and cheaper.…”

Preparation and characterization of CuInSe2 nanoparticles elaborated by novel solvothermal protocol using DMF as a solvent

“…CIS nanoparticles were also synthesized by solvothermal route [7,9], which features easy handling and high reproducibility. Many reported solvothermal preparations involve the reaction of constituent elements (Cu, In, Ga and Se) or their salts in heated solution for several hours even several days [10,12].…”