微波液相合成法制备Cu_2ZnSnS_4纳米颗粒及其薄膜的研究

Study on the preparation of Cu_2ZnSnS_4 nanoparticles and films by microwave irradiation assisted solvothermal method

采用乙二醇作为溶剂,硫代乙酰胺作为硫源,通过微波液相合成法制备出颗粒大小均一的Cu2ZnSnS4(CZTS)纳米颗粒。采用XRD、Raman、EDS、TEM以及UV-Vis-Nir等表征手段对所制备的纳米颗粒的物相、元素比例、形貌以及光学性能进行了分析。测试结果表明,所制备的CZTS纳米颗粒为(112)择优取向的锌黄锡矿结构,纳米颗粒的平均尺寸约为3.4nm,其光学带隙为1.85eV,呈现出明显的量子尺寸效应导致的光学带隙蓝移现象。将CZTS纳米颗粒制成CZTS墨水并滴涂烘干形成了CZTS薄膜,其XRD和SEM结果表明,所制备的CZTS薄膜具有良好的结晶性,且表面较为致密。光照与暗态的I-V曲线测试表明,所制备薄膜具有明显的光电导效应。

In this paper,Cu2 ZnSnS4 (CZTS)nanoparticles were synthesized with ethylene glycol as solvent and thioacetamide as sulfur source by microwave irradiation assisted solvothermal method.The structure,shape, composition and optical properties of as-synthesized CZTS nanoparticles were investigated with X-ray diffrac-tion,Raman spectroscopy,scanning electron microscopy,energy dispersive spectrometer and UV-Vis-Nir spec-troscopy.The results show that the as-synthesized nanoparticles have kesterite structure and stoichiometric composition.The average size of the CZTS nanoparticles was about 3.4 nm.And the band gap of CZTS nanopar-ticles was 1.85 eV,which shows an apparent band gap blue-shift due to the quantum size effect.CZTS ink was formed from CZTS nanoparticles and then CZTS thin films were on glass substrates by drop casting (ink-print method).The results of XRD and SEM from the CZTS thin films show the as-prepared CZTS thin film has a good crystalline and the surface is compact.The CZTS thin film has an obvious photoconductive effect by I-V test under light illumination and darkness.