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以乙酰丙酮铜(Cu(AcAc)2)、乙酸锌(Zn(CH3COO)2·2H2O)、氯化亚锡(SnCl2·2H2O)、升华硫(S粉)和十二硫醇为原料,用热注射法合成了Cu2ZnSnS4(CZTS)纳米晶。再将Cu2ZnSnS4纳米晶制成胶体墨水,用旋涂法制备出Cu2ZnSnS4薄膜。用X射线衍射(XRD)仪、拉曼光谱(RS)仪、透射电镜(TEM)、扫描电镜(SEM)、X射线能量色散谱仪(EDS)和紫外-可见光谱(UV-Vis)分光光度计对CZTS纳米晶及薄膜的晶体结构、微观形貌、化学组成及光学性能进行表征,研究了注射温度对纳米晶结构、形貌、晶粒大小以及化学组成的影响以及热处理时间对Cu2ZnSnS4薄膜结构、形貌、化学组成和光学性能的影响。结果表明,在注射温度为180℃时合成的CZTS纳米晶为锌黄锡矿结构,平均粒径为18 nm。在500℃热处理2 h所制备出的薄膜,在可见光范围内其吸收系数高达104cm-1,禁带宽度为1.45 eV。
Using acetylacetone copper (AcAc) 2, zinc acetate (Zn (CH3COO) 2 · 2H2O), stannous chloride (SnCl2 · 2H2O), sublimed sulfur (S powder) and dodecanethiol as raw materials, Cu2ZnSnS4 (CZTS) nanocrystals were synthesized by injection. Then Cu2ZnSnS4 nanocrystals were made into colloidal inks, and Cu2ZnSnS4 thin films were prepared by spin coating. The structures of the samples were characterized by X-ray diffraction, Raman spectroscopy, TEM, SEM, EDS and UV-Vis spectrophotometry The crystal structure, microstructure, chemical composition and optical properties of CZTS nanocrystalline and thin films were characterized. The effects of injection temperature on the structure, morphology, grain size and chemical composition of nanocrystals and the effect of heat treatment time on the structure of Cu2ZnSnS4 thin films , Topography, chemical composition and optical properties. The results show that the CZTS nanocrystals synthesized at the injection temperature of 180 ℃ are of kyanite structure and the average particle size is 18 nm. The films prepared at 500 ℃ for 2 h had an absorption coefficient of up to 104 cm-1 in the visible range and a band gap of 1.45 eV.