Nano-spherical Co^(2+)-doped FeS_2 was synthesized through a simple solvothermal method. The products were investigated using XRD, FE-SEM, BET, ICP, EDS, TEM, HRTEM, XPS, and UV-vis spectroscopy. The results indicated that Co^(2+) ion could change the particle nucleation process and inhibited the particle growth of FeS_2. In addition, when the content of doped Co^(2+) was 15%, the degradation efficiency of methylene blue(MB) achieved 60.72% after 210 min irradiation, which increased by 52.01% than that of the undoped FeS_2. Moreover, comparison experiments also demonstrated that the M(M=Co^2+,Co^2+/Ni^2+)-doped FeS_2 photocatalytic activity efficiency sequence was Co^(2+) 〉 Ni^(2+)〉Co^(2+)/Ni^(2+). This is ascribed to the fact that the Co^(2+) doping could induce the absorption edge shifting into the visible-light region and increased the surface area of the samples. The effect mechanisms of M-doping on the band gap and the photocatalytic activity of FeS_2 were also discussed.
分别采用超声微波溶剂热法、常压溶剂热法及高压溶剂热法制备In_2Se_3/CuSe粉体,研究不同方法制备In_2Se_3/CuSe粉体的物相、形貌,并利用涂覆–快速热处理法制作薄膜太阳电池吸收层。通过XRD、Raman、FESEM和TEM对样品的物相、形貌和组成进行了表征。结果表明:超声微波溶剂热法和常压溶剂热法得到的产物是以In_2Se_3+CuSe混合相的形式存在,高压溶剂热法合成的In_2Se_3/CuSe粉体则呈核壳结构,(以In_2Se_3为核,CuSe为壳)。涂覆–快速热处理法制备CIS薄膜的FESEM照片结果表明,高压溶剂热法合成的In_2Se_3/CuSe更容易获得平整致密的薄膜。将该CIS薄膜直接用于电池器件的组装,获得的光电性能参数:Voc为50 m V,Jsc为8 m A/cm^2。