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α-Fe2O3(带隙2.2eV)和Zn2SnO4(带隙3.6eV)两者都是廉价的光电材料,然而前者光生载流子复合效率较高,后者只有在紫外光区有光电响应.本文采用水热法制备了核壳结构的α-Fe2O3@Zn2SnO4复合材料,利用X射线衍射(XRD)、场发射电子扫描电子显微镜(FESEM)、X射线光电子能谱(XPS)、紫外可见吸收光谱(UV-vis)及表面光电压谱(SPS)等分析手段进行材料结构、形貌和性能表征.结果表明,该核壳结构复合材料的光电响应比单一组分光电响应的强度和范围都有明显的改善.该复合材料光电响应的改善,与水热法制备的α-Fe2O3@Zn2SnO4核壳结构有关.α-Fe2O3与Zn2SnO4复合后Fe2p的结合能变化明显这可能有利于光生载流子分离.
Both α-Fe2O3 (bandgap 2.2eV) and Zn2SnO4 (bandgap 3.6eV) are cheap optoelectronic materials, however, the former photo-generated carrier recombination efficiency is higher, the latter only in the ultraviolet region has a photoelectric response.In this paper, The α-Fe2O3 @ Zn2SnO4 composites with core-shell structure were prepared by hydrothermal method. The structure of the α-Fe2O3 @ Zn2SnO4 composites were characterized by X-ray diffraction, field emission scanning electron microscopy -vis) and surface photovoltage spectroscopy (SPS) were used to characterize the structure, morphology and properties of the composites.The results show that the optical and electrical responses of the core-shell composites are significantly improved compared with that of the single component The improvement of the photoelectrical response of the composites is related to the α-Fe2O3 @ Zn2SnO4 core-shell structure prepared by hydrothermal method.The binding energy of Fe2p changed obviously after α-Fe2O3 and Zn2SnO4 complex, which may be helpful for the photocarrier separation.