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采用溶剂热合成技术,以乙醇为溶剂,以氯化锌、氯化亚锡、氯化铜和硫脲为反应剂,以草酸为还原剂,以十六烷基三甲基溴化铵为阳离子表面活性剂,直接在透明导电玻璃(FTO)衬底上制备Cu_2ZnSnS_4(CZTS)半导体纳米晶薄膜。采用X射线衍射(XRD)、喇曼光谱、透射电镜(TEM)、扫描电子显微镜(SEM)和紫外-可见光谱研究了反应温度对CZTS纳米晶薄膜的形貌、结构和光学性能的影响规律。结果表明:CZTS纳米晶薄膜具有锌黄锡矿结构,当反应温度从140℃逐渐升高到230℃时,纳米晶的平均晶粒尺寸从4.25 nm逐渐增加到13.17 nm,禁带宽度从1.76 eV减小到1.53 eV;同时,低温下制备的CZTS薄膜由平均直径约450 nm的类球形颗粒组成,高温下制备的薄膜逐步演变成由相互卷绕的纳米纸构成。
Solvent heat synthesis technology, ethanol as solvent, zinc chloride, stannous chloride, copper chloride and thiourea as reactants, oxalic acid as reducing agent, cetyltrimethylammonium bromide as cation The CuZnSnS_4 (CZTS) semiconductor nanocrystalline thin films were prepared directly on the transparent conductive glass (FTO) substrate. The effects of reaction temperature on the morphology, structure and optical properties of CZTS nanocrystalline films were investigated by X-ray diffraction (XRD), Raman spectroscopy, transmission electron microscopy (TEM), scanning electron microscopy (SEM) and UV- The results show that the nanocrystalline CZTS has a kyanite structure. When the reaction temperature is gradually increased from 140 ℃ to 230 ℃, the average grain size of nanocrystalline nanocrystals increases from 4.25 nm to 13.17 nm, and the band gap increases from 1.76 eV To 1.53 eV. Meanwhile, CZTS films prepared at low temperature consist of spherical particles with an average diameter of about 450 nm. The films prepared at high temperature gradually evolved into nanofibers wrapped by each other.