A Green and Air Pressure Solution Synthesis of CuInSe 2 Nanocrystals Using 1‐methyl‐2‐Pyrrolidinone as Hot Solvent

High crystalline and single‐phase chalcopyrite CuInSe 2 nanocrystals were synthesized at 180°C by a air pressure organic solvent phase synthesis using green and relative high boiling point 1‐methyl‐2‐pyrrolidinone polar solvent, and sodium selenite, copper(II) chloride, and indium(III) chloride were used as inorganic precursor sources. The crystallization, morphology, chemical stoichiometry, and light property of the deposited products were characterized by X‐ray diffraction (XRD), high resolution transmission electron microscopy, X‐ray photoelectron spectra (XPS), energy‐dispersive X‐ray spectroscopy, and UV–vis–NIR absorption spectrum. The influence of the Cu:In:Se mol ratios in initial precursor solutions on chemical stoichiometry and phase composition of the resultant nanocrystals was investigated. And the chemical reaction mechanism involved in the organic solvent phase synthesis process was discussed based on XRD and XPS analysis.