Controlled Synthesis and Optical Properties of CuInS_2 Nanocrystals

摘要

A facile method for the synthesis of size- and shape-controlled CuInS_2 semiconductor nanocrystals was developed by thermolysis of a mixed solution of Cu(acac)_2, In(acac)_3 and dodecanethiol at 200°C. By adjusting the reaction time, CuInS_2 nanocrystals with size of ～2 to ～6 nm were obtained. The as-prepared nanocrystals were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), UV-vis absorption and photoluminescence (PL) spectroscopy. The nanocrystals solutions exhibit tunable absorption and PL spectra with the absorption edge ranging from 450 to 750 nm while the PL emission peaks from 660 to 700, indicting a strong size-dependent quantum confinement effect. The proposed synthesis strategy developed in this work may be used as a general process for other metal chalcogenides nanocrystals and may have a bright application prospects in different areas, such photovoltaic application, in the future.