EDTA辅助水热合成FeS2/NiSe2复合纳米晶及其薄膜光电性质

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40—50nm.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. 关键词： 2纳米晶')" href="#">FeS₂纳米晶 水热 诱导结晶 直接禁带宽度 

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

Nonacomposites of NiSe₂was successfully synthesized by EDTA assisted hydrothe rm al method, adding NiSe₂ with MX2 structure as seed. X_ray diffraction pa tterns indicate that the products are single phase FeS₂(pyrite) with the average grain size of about 48nm. FeS₂thin 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 c oncentration decreases. The FeS₂thin film shows an n_type semiconductor chara cteristic. The mechanism of the formation of FeS₂(pyrite) nanocrystalline was discussed in terms of the growth process.