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EDTA辅助水热合成FeS₂NiSe₂复合纳米晶及其薄膜光电性质

EDTA-assisted hydrothermal synthesis of FeS₂/NiSe₂ nonacomposites and the optical and electrical properties of their thin films

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【Author】 Wu Rong~(1)) Zheng Yu-Feng~(1)) Zhang Xiao-Gang~(2)) Sun Yan-Fei~(1)) Xu Jin-Bao~(1))()~(1))(Laboratory of Materials, Department of Physics, Xinjiang University, Urumqi\ 830046, China)()~(2))(Institute of Apply Chemical, Xinjiang University, Urumqi 830046,China)

【机构】新疆大学物理系材料实验室；新疆大学应用化学研究所；新疆大学物理系材料实验室乌鲁木齐830046；乌鲁木齐830046；乌鲁木齐830046；

【摘要】以EDTA为螯合剂,加入MX2结构化合物NiSe₂作为晶种,水热合成了FeS₂ 纳米晶 .x射线衍射分析结果表明产物为单一相黄铁矿型FeS₂ （pyrite） ,平均粒径约 4 0— 5 0nm .丝网印刷成膜且高温退火后FeS₂ 薄膜光学直接带隙变宽 .随晶种量的增加 ,吸收边在紫外—可见光谱区红移、方块电阻升高、霍尔迁移率上升和载流子浓度下降 ,实现了n型掺杂 .并且对FeS₂ 的形成机理进行了讨论更多还原

【Abstract】 Nonacomposites of FeS₂ was successfully synthesized by EDTA-assisted hydrothermal method, adding NiSe₂ with MX₂ structure as seed. X_ray diffraction patterns indicate that the products are single phase FeS₂ （pyrite） with the average grain size of about 48nm. FeS₂ thin films were prepared by screen_printing method and annealed at high temperature. It has been shown that they have an increased direct bandgap. With increasing amount of seed, the absorbance edges in the ultraviolet_visible range show a red shift; the resistance goes up; Hall mobility rises and the carrier concentration decreases. The FeS₂ thin film shows an n_type semiconductor characteristic. The mechanism of the formation of FeS₂ （pyrite） nanocrystalline was discussed in terms of the growth process.更多还原