Novel CuO/TiO 2 Nanocomposite Films with a Graded Band Gap for Visible Light Irradiation
Novel CuO/TiO 2 Nanocomposite Films with a Graded Band Gap for Visible Light Irradiation
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DOI：
10.1166/mex.2012.1069
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发表时间：
2012-09
影响因子：
0.7
通讯作者：
Xiang-chao Zhang;A. Tang
中科院分区：
文献类型：
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作者：
Xiang-chao Zhang;A. Tang
采用溶胶-凝胶法，通过改变CuO/TiO 2摩尔比的组成，沿沿着深度方向从基底到表面，设计并合成了具有渐变带隙的CuO/TiO 2纳米复合薄膜。采用X射线衍射（XRD）、X射线光电子能谱（XPS）、原子力显微镜（AFM）、紫外-可见（UV-vis）和伏安（V-I）等测试手段对样品进行了表征。结果表明，改性后的CuO/TiO 2纳米复合薄膜的化学成分沿厚度方向沿着呈梯度变化，其吸收边向可见光区移动，光电化学性能较TiO 2薄膜有明显提高。实验结果为薄膜太阳能电池的发展提供了一个有趣的视角。
CuO/TiO2 nanocomposite film with a graded band gap was designed and synthesized by varying the composition of CuO/TiO2 molar rate from the substrate to the surface along the depth direction using the sol–gel method. The as-synthesized samples were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), ultraviolet-visible (UV-vis) and voltage–current (V – I) analyses. The results demonstrated that the chemical compositions of CuO/TiO2 upgraded nanocomposite film achieved gradient composition along the thickness direction, the absorption edge for CuO/TiO2 nanocomposite film had a red shift which moved towards the visible light region, and the photoelectrochemical properties of the nanocomposite film was evidently improved comparing with that of TiO2 film. The experimental result provided an intriguing perspective on the development of the thin film solar cell.