TiO2钝化ZnO阵列增强量子点敏化太阳电池的光俘获和电子收集

Saved in:
Bibliographic Details
Published in中国科学：材料科学（英文版） Vol. 60; no. 3; pp. 239 - 250
Main Author 赵海峰 吴强 侯娟 曹海宾 井群 吴荣 刘志勇
Format Journal Article
LanguageEnglish
Published 2017
Subjects
TiO2
ZnO纳米棒
俘获
太阳电池
敏化
电子传输特性
纳米棒阵列
量子点
Online AccessGet full text

Cover

More Information
Bibliography:TiO2 nanoparticles, ZnO nanorod arrays, quantum dot sensitized solar cells
Haifeng Zhao1,2, Qiang Wu1,2, Juan Hou1,2, Haibin Cao1, Qun Jing1, Rong Wu3 , Zhiyong Liu2.（1 School of Science/Key Laboratory of Ecophysics and Department of Physics, Shihezi University, Shihezi 832003, China ;2 School of Chemistry and Chemical Engineering/Key Laboratory for Green Process of Chemical Engineering of Xinjiang Bingtuan, Shihezi University, Shihezi 832003, China ;3 Key Laboratory of Solid-state Physics and Devices, School of Physical Science and Technology, Xinjiang University, Urumqi 830046, China ）
Light capture and electron recombination are the essential processes that determine power conversion efficiency （PCE） in quantum dot sensitized solar cells （QD- SCs）. It is well known that charges are easily transported in well-built QDSCs based on nauorod arrays. However, this advantage can be drastically weakened by defects located at the zinc oxide （ZnO） array surface which permit faster electron recombination. Hence, we developed a composite nanostructure consisting of ZnO nanorods coated with orthorhombic configuration titanium dioxide （TiO2） nanopartides, which were synthesized using a solution of H3BO3 and （NH4）2TiF6. This composite nanostructure was designed to take the advantage of the enlarged surface area provided by the nanoparticles and improved electron transport along the nanorods, in order to yield good charge transport and light harvesting. At the same time, the TiO2/ZnO nanorod arrays have fewer recombination centers （hydroxyl groups） after TiO2 modification, which results in fewer electron trapping events at the ZnO nanorod surface; thereby, a reduced charge recombination and longer electron lifetime can be achieved. As a result, the PCE of the QDSCs with TiO2-nanopartides-decorated ZnO nanorod arrays photoelectrode reaches 4.8%, which is ～78% higher efficiency compared to 2.7% for solar cells without modification.
10-1236/TB
ISSN:2095-8226
2199-4501