一维纳米阵列具有直接的电子传输通道与高的电荷收集效率，进一步提高染料吸附、增大电荷注入、抑制电荷复合是获得高效染料敏化太阳能电池的必要举措。本项目拟在高度有序的氧化钛纳米管阵列中引入W掺杂氧化钛纳米颗粒形成芯壳结构，进而对芯壳结构表面包覆Al2O3或HfO2阻挡层，形成分级芯壳结构纳米阵列光阳极。研究W掺杂氧化钛纳米颗粒引入到氧化钛纳米管表面对光阳极染料吸附量、光注入效率和载流子复合的影响,阐明掺杂含量与能带偏移、载流子传输和光电性能间的相互关系；研究阻挡层引入对光阳极中载流子复合的影响,揭示分级芯壳结构中阻挡层引入对抑制载流子复合和提高电池光电性能的作用；提出相应的分级芯壳结构纳米阵列中电荷输运机制，建立电荷输运模型，提高氧化钛纳米阵列染料敏化太阳能电池的效率。开展本项目研究对于开发高效率、低成本的染料敏化太阳能电池、深入理解其内部电荷传输机制具有重要的科学意义与理论指导作用。

In one-dimensional nano-array dye-sensitized solar cells (DSSCs)，it is important to further improve the high power conversion efficiency of DSSCs by enhancing the dye loading, improving the electron injection efficiency, and suppressing the charge recombination, although one-dimensional nano-arrays have advantages of direct pathways for electron transport and high charge-collection efficiency. In this project, W-doped TiO2 nanoparticles are introduced into the free-standing anodized TiO2 nanotube array to form core-shell array firstly, and then the Al2O3 or HfO2 blocking layer is coated onto the nanotube/nanoparticles core-shell structure to finally form a hierarchical core-shell nanoarray photoanode. The effect of introducing of W-doped TiO2 nanoparticles into TiO2 nanotubes on the dye adsorption, electron injection efficiency and charge recombination will be investigated,and thereby to revel the relationship between the doping content and the conduction band shifting, charge transport and photovoltaic properties of photoanodes. The infuence of blocking layer on the suppressing of charge recombination of the photoanodes will be studied in this project as well, and accordingly to understand the role of the blocking layer on the photovoltaic properties and charge transport of the hierarchical core-shell nanoarray photoanodes. The internal charge transport mechanisms and models of TiO2 nanoarrays will be proposed in this project and this is possible to improve the photovoltaic performance of DSSCs dramatically. This topic is significantly important for the exploring of high conversion efficiency, low-cost DSSCs and understanding their internal charge transport mechanisms perfectly.