Abstract
The results of investigations of the AgInS2 and CuInS2 nanocrystals (NCs) by the photoluminescence (PL), PL excitation (PLE), optical absorption, Raman scattering and X-ray diffraction (XRD) methods are presented. The NCs were synthesized under stoichiometric conditions in aqueous solutions in the presence of aliphatic mercapoacids and transferred in polymer films of gelatin. The XRD patterns and Raman spectra indicated formation of the AgInS2 and CuInS2 NCs of chalcopyrite phase mainly of the average size of about 4 and 2 nm, respectively. The PL spectra of the NCs showed intense defect-related band being much broader for the AgInS2 crystallites. The PLE spectra demonstrated strong dependence on the emission position in the PL spectrum. The low-temperature PL study showed that the PL band of the AgInS2 NCs consisted of two components originated from the ensembles of the NCs of different crystal structure presumably of the chalcopyrite and cubic phases.
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