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Chalcopyrite-type CuInS2 NCs was synthesized by the hot-soap method. Mixed solutions, CuI and InCl3 dissolved in the mixture of the tri-octylphosphite and 1-octadecene and the sulfur dissolved in tri-phenylphosphite, were used as source solutions; the hexadecylamine was additionally mixed as a surfactant before the reaction. It was observed that the product CuInS2 NCs structurally transformed from the chalcopyrite(CP)-or zincblende(ZB)-to the wurtzite(WZ)-type depending on the amount of the surfactant and a storage time after the surfactant addition. Very weak photoluminescence in the near-infrared region was observed for the CP-or ZB-type NCs. This band was attributable to the electronhole recombination via defect levels. No photoluminescence was detected for the wurtzite-type NCs.
Chalcopyrite-type CuInS2 NCs was synthesized by the hot-soap method. Mixed solutions, CuI and InCl3 dissolved in the mixture of the tri-octylphosphite and 1-octadecene and the sulfur dissolved in tri-phenylphosphite, were used as source solutions; the hexadecylamine was otherwise mixed as a surfactant before the reaction. It was observed that the product CuInS2 NCs structurally transformed from the chalcopyrite (CP) -or zincblende (ZB) -to the wurtzite (WZ) -type depending on the amount of the surfactant and a storage time after the surfactant addition. Very weak photoluminescence was observed in the near-infrared region for the CP-or ZB-type NCs. This band was attributable to the electron hole recombination via defect levels. No photoluminescence was detected for the wurtzite-type NCs .