Ministry-of-Education Key Laboratory for the Green Preparation and Application of Functional Materials, Faculty of Materials Science and Engineering, Hubei University, Wuhan 430062, PR China.
J Colloid Interface Sci. 2012 Jan 1;365(1):46-52. doi: 10.1016/j.jcis.2011.08.073. Epub 2011 Sep 6.
A novel TiO(2) double-layer (DL) film consisting of TiO(2) hollow spheres (HSs) as overlayer and single-crystalline TiO(2) nanorod arrays (RAs) as underlayer was designed as the photoanode of dye-sensitized solar cells (DSSCs). This new-typed TiO(2) HS/RA DL film could significantly improve the efficiency of DSSCs owing to its synergic effects, i.e. the relatively large specific surface area of TiO(2) HSs for effective dye adsorption, enhanced light harvesting capability originated from TiO(2) RA film, and rapid interfacial electron transport in one-dimensional TiO(2) nanorod arrays. The overall energy-conversion efficiency of 4.57% was achieved by the formation of TiO(2) DL film, which is 16% higher than that formed by TiO(2) HS film and far larger than that formed by TiO(2) RA film (η=0.99%). The light absorption and interfacial electron transport, which play important roles in the efficiency of DSSCs, were investigated by UV-vis absorption spectra and electrochemical impedance spectra.
一种新型 TiO(2) 双层（DL）薄膜，由 TiO(2) 空心球（HSs）作为覆盖层和单晶 TiO(2) 纳米棒阵列（RAs）作为底层组成，被设计为染料敏化太阳能电池（DSSCs）的光阳极。由于协同效应，这种新型 TiO(2) HS/RA DL 薄膜可以显著提高 DSSCs 的效率，即 TiO(2) HSs 具有较大的比表面积，有利于有效吸附染料，TiO(2) RA 薄膜增强了光捕获能力，一维 TiO(2) 纳米棒阵列中具有快速的界面电子传输。通过形成 TiO(2) DL 薄膜，实现了 4.57%的整体能量转换效率，比 TiO(2) HS 薄膜形成的效率高 16%，比 TiO(2) RA 薄膜形成的效率（η=0.99%）大得多。通过紫外可见吸收光谱和电化学阻抗谱研究了在 DSSCs 效率中起重要作用的光吸收和界面电子传输。
