量子点敏化太阳能电池光电转换效率较低的主要因素包括较低的量子点负载量、量子点较窄的光吸收范围、及严重的光生电荷复合。为提高量子点敏化太阳能电池的光电转换效率，本项目拟制备一种结构新颖的透明光电极，即双面CdS和CuInS2量子点共同敏化的TiO2纳米管/ITO玻璃光电极。相比普通单面结构的电极，这种双面结构的光电极能提供更大的多孔空间，这既能提高量子点的负载量，又能通过在透明电极的两个面上分别敏化具有不同能带带隙的CdS和CuInS2量子点来扩展光电极的光吸收范围。此外，为了减少光生电荷的复合，在TiO2纳米管表面沉积了一层ZnO能量阻隔层。本项目将对透明双面电极的表面形态、光学性质和光电化学性质进行系统地研究，揭示电极的双面结构和沉积的CdS和CuInS2量子点对光生电荷的产生和输运机制，以及电池光电转换效率的影响规律。本项目的研究将对通过改进光电极的结构提高电池的光电转换效率提供指导。

The main reasons for the low efficiencies of QDSCs are low quantum dots (QDs) loading amount due to the limited space in the nono porous electrode, narrow absorption spectrum of QDs, and serious charge recombination. In this project, a new transparent photoelectrode with novel structure, i.e., double-sided CdS and CuInS2 cosensitized TiO2 nanotubes/indium-tin-oxide glass electrode, will be fabricated to improve the efficiencies of QDSCs. In comparison to common single-sided structures, this double-sided structure provides more space in the photoelectrode, which will result in an increased quantum dots (QDs) loading amount and extend the range of light absorption by respective sensitization of CdS and CuInS2 QDs on each side. In addition, a ZnO thin film as an energy barrier layer will be deposited on the surface of TiO2 nanotubes to reduce the photo-generated charge recombination. In this project, the surface morphology, optical property and photoelectrochemical properties of the transparent and double-sided electrode will be systematically studied to reveal the influences of double-sided structure of the electrode and deposited CdS and CuInS2 QDs on the generation and transportation mechanisms of photo-generated charges and the efficiencies of QDSCs. This research will provide scientific guidance to improve the photoelectric conversion efficiency of quantum dot sensitized solar cells by improving the electrode structure.