Cu2ZnSnS4纳米晶的制备及其三阶非线性光学性能的研究

以乙酰丙酮铜、醋酸锌、二氯亚锡、油胺和硫粉为前驱体,采用one-pot法合成出了单分散的Cu2ZnSnS4(CZTS)纳米晶.所得样品采用X射线粉末衍射仪(XRD),能量色散谱仪(EDS),透射电子显微镜(TEM),高分辨透射电子显微镜(HRTEM),光电子能谱仪(XPS),紫外-可见光谱仪(UV-vis)和Z-扫描(Z-scan)技术对其结构组成、形貌、性能等进行了表征.结果表明:所获得的产物为四方相结构的六边形CZTS纳米颗粒,直径约为10 nm.计算出尺寸大小为10 nm,13 nm的纳米晶的三阶非线性光学折射率γ(-1.08×10-15,-9.08×10-17 m2·W-1),三阶非线性光学吸收系数β(6.5×10-9,3.69×10-11 m·W-1)以及三阶非线性光学极化率χ(3)(1.49×10-9,4.35×10-10 esu).并探讨了CZTS纳米晶可能的形成机理,及引起三阶光学非线性发生变化的原因。

Synthesis of Cu2ZnSnS4 Nanocrystals and Its Third-order Nonlinear Optical Properties

Monodisperse Cu2ZnSnS4(CZTS) nanocrystals were synthesized by one-pot method using cop-per(Ⅱ) acetylacetonate,zinc(Ⅱ) acetate,tin(Ⅱ) chloride,S powder and oleylamine as precursors.The compo-sition,structure,morphology and properties of the CZTS were characterized by X-ray diffraction(XRD),energy dispersive X-ray(EDS),transmission electron microscopy(TEM),high-resolution transmission elec-tron microscopy(HRTEM),X-ray photoelectron spectroscopy(XPS),UV-vis and Z-scan technology.The results showed that the as-prepared CZTS nanocrystals were tetragonal phase with hexagonal shape and par-ticle size about 10 nm.The nonlinear refraction index γ(-1.08×10-15,-9.08×10-17 m2·W-1),nonlinear absorption coefficient β(6.5×10-9,3.69×10-11 m·W-1) and third-order optical susceptibility χ(3)(1.49× 10-9,4.35×10-10 esu) of CZTS nanocrystals with different size(10 nm,13 nm) were calculated.Finally,the growth mechanism of nanocrystals and the nonlinear optical properties were investigated.