Abstract: CuInSe2 nanocrystals ( NCs) were synthesized by hot injection method using cuprous chloride (CuCl), indium chloride(InCl3· 4H2O), and selenium powder (Se) dissolving in a trioctylphosphine ( TOP) solution as raw materials and Oleylamine ( OLA ) and octadecylene ( ODE ) as ligand and solvent .Crystal structure , component and optical properties of as-synthesized CuInSe 2 NCs samples were characterized by X-ray diffractometer ( XRD ) , transmission electron microscopy ( TEM ) , energy dispersive spectroscopy ( EDS ) , Ultraviolet-visible spectrophotometer ( UV-vis ) . The influence of different reaction temperatures on the crystal structure , morphology , chemical composition and optical properties of CuInSe 2 was investigated . The results show that the CuInSe 2 NCs possess different morphology with chalcopyrite structure , the morphology of NCs evolve from triangle or quadrangle to sphere.The average grain size is in the range of 3.71-13.65 nm.The band gap of the NCs prepared at different reaction temperatures vary between 1.75 eV and 1.50 eV.Stable"ink"can be formed when the CuInSe 2 nanocrystals are dispersed in the organic solvent such as toluene , and such "ink"might have a practical application in CuInSe 2-based solar cells .

Key words: CuInSe2 nanocrystals ( NCs) were synthesized by hot injection method using cuprous chloride (CuCl), indium chloride(InCl3· 4H2O), and selenium powder (Se) dissolving in a trioctylphosphine ( TOP) solution as raw materials and Oleylamine ( OLA ) and octadecylene ( ODE ) as ligand and solvent .Crystal structure , component and optical properties of as-synthesized CuInSe 2 NCs samples were characterized by X-ray diffractometer ( XRD ) , transmission electron microscopy ( TEM ) , energy dispersive spectroscopy ( EDS ) , Ultraviolet-visible spectrophotometer ( UV-vis ) . The influence of different reaction temperatures on the crystal structure , morphology , chemical composition and optical properties of CuInSe 2 was investigated . The results show that the CuInSe 2 NCs possess different morphology with chalcopyrite structure , the morphology of NCs evolve from triangle or quadrangle to sphere.The average grain size is in the range of 3.71-13.65 nm.The band gap of the NCs prepared at different reaction temperatures vary between 1.75 eV and 1.50 eV.Stable"ink"can be formed when the CuInSe 2 nanocrystals are dispersed in the organic solvent such as toluene , and such "ink"might have a practical application in CuInSe 2-based solar cells .