A new ZnO nanotetrapods/SnO2 nanoparticles composite photoanode for high efficiency flexible dye-sensitized solar cells

被引:53
作者
Chen, Wei [1 ]
Qiu, Yongcai [1 ]
Yang, Shihe [1 ]
机构
[1] Hong Kong Univ Sci & Technol, Dept Chem, Kowloon, Hong Kong, Peoples R China
关键词
LOW-TEMPERATURE FABRICATION; CONVERSION EFFICIENCY; TIO2; FILMS; HYDROTHERMAL CRYSTALLIZATION; NANOCRYSTALLINE TIO2; EQUIVALENT-CIRCUIT; ELECTRON INJECTION; PHOTOELECTRODES; ENHANCEMENT; SNO2;
D O I
10.1039/c000584c
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We report a new photoanode for flexible dye sensitized solar cells based on a judicious combination of SnO2 nanoparticles and ZnO nanotetrapods and the development of an effective low temperature fabrication technique of "acetic acid gelation-mechanical press-ammonia activation''. A 4.91% efficiency has been achieved on an ITO-coated polyethylenenaphthalate (ITO/PEN) substrate under 1 sun equivalent illumination. The peculiar symmetrical branching morphology of ZnO nanotetrapods is beneficial to charge collection of the SnO2/ZnO composite photoanode. The formation of a thin ZnO shell on SnO2 nanoparticles, after ammonia activation, is critical to boosting the open-circuit photovoltage and to improving inter-particle contacts as well as photoelectron injection. The mechanical press, apart from enhancing film durability, has also significantly improved charge collection.
引用
收藏
页码:9494 / 9501
页数:8
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