溶剂热法CuInSe_2粉体的形貌可控制备与表征

Synthesis and Characterization of Morphology-Controllable CuInSe_2 Powders by Solvothermal Route

采用溶剂热法,通过改变反应温度和初始nCu/nIn比制备了一系列CuInSe2粉体。粉体的物相结构、形貌、光吸收性能分别用X射线衍射仪(XRD)、场发射扫描电镜(FESEM)、透射电镜(TEM)、紫外-可见分光光度计(UV-Vis)进行了表征。结果表明:180℃反应即可形成纯黄铜矿型CuInSe2粉体;随着反应温度的升高,粉体形貌有"片-片簇-球簇"的演变规律,其光吸收性能也随之增强,出现"红移"现象;初始nCu/nIn比能有效调控片簇的致密度。同时探讨了粉体不同形貌的形成机理。

A series of CuInSe2 powders were prepared respectively by changing the reaction temperatures and initial Cu/In molar ratios,via a facile solvothermal route.The phase,morphology and light absorption performance were characterized by XRD,FESEM,TEM and UV-Vis,respectively.It is found that the chalcopyrite CuInSe2 can be successfully fabricated at 180 ℃.While increasing the reaction temperature,the morphologies of as-prepared powders evolve gradually from flake to 2-Dimension（2D） hexagonal flake cluster,then to 2D hexagonal sphere cluster.And their light absorption properties can also be resluting enhanced with a red shift of the absorption edge.Further studies reveal that the initial Cu/In molar ratios can effectively control the density of flake cluster.Additionally,a possible growth mechanism of the novel morphologies is also preliminarily discussed in this paper.