XRD pattern (a), A TEM image (b), and UV-visible absorption spectra (c) of Cu(In0.5Ga0.5)Se2 NCs. Inset in (b) shows the high-resolution TEM (HRTEM) images of Cu(In0.5Ga0.5)Se2 NCs. The NCs are calculated to be approximately 17 nm in average. Insets in (c) show the image of NCs dispersed in toluene solvent and the determination of band gap of approximately 1.2 eV by direct band gap method.
Yen et al. Nanoscale Research Letters 2013 8:329 doi:10.1186/1556-276X-8-329