g沉积提升CdS量子点敏化太阳能电池性能研究

With the high theoretical conversion efficiency of 44%, quantum-dot-sensitized solar cells (QDSSCs) has become a new type solar cell with great potential for application. Highly ordered TiO2 nanotube arrays (TNAs) is increasingly being used in QDSSCs, due to the unique structure which facilitate the transport of photo-generated electrons. However, there are still many problems with the application of TNAs in DSSCs, where one of the most influential aspects is the interface between quantum-dot sensitizer and TNAs. In this article, Ag nanoparticles with the excellent electron conductivity and effect of scattering the incident light were deposited on the surface of TNAs by photochemical reduction deposition method, which could modify the interface of CdS quantum dots and TNAs. The UV-visible absorption spectrum showed that the absorption band edge of TNAs at 380 nm. After the deposition of Ag nanoparticles, the absorption capacity of the TNAs has been effectively enhanced in the ultraviolet and visible region. The electrochemical impedance spectroscopy demonstrated that Ag deposition effectively reduced the interface resistance between the quantum dots and TNAs, and improved the photo-generated carriers transfer. The conversion efficiency of the solar cells with Ag nanoparticles modification increased by 133% compared with the unmodified solar cells.