Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 21, Issue 14, Pages 5457-5463Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0jm03112g
Keywords
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Funding
- National Basic Research Program of China [2011CBA00700]
- National High Technology Research and Development Program of China [2009AA050603]
- Chinese Academy of Sciences for Key Topics in Innovation Engineering [KGCX2-YW-326]
- National Natural Science Foundation of China [20703046]
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The influence of TiO2 nanotubes on the charge collection efficiency and the dynamics of electron transport and recombination in dye-sensitized solar cells (DSCs) based on the TiO2 nanotube/nanoparticle composite films were investigated in this paper. Electrochemical impedance spectroscopy was employed to quantify the charge transfer resistance of DSCs. The different transport and recombination properties of DSCs were studied by frequency-resolved modulated photocurrent/photovoltage spectroscopies. It was shown that the electrons had a longer lifetime in the nanotubes and retarded recombination more significantly than in the nanoparticles. But with increasing the amount of nanotube, the electron pathway was extended seriously in these network structures resulting in increased recombination chances. In addition, the 5 wt% nanotube DSC had the highest charge collection efficiency among all the DSCs, which yielded a high photovoltaic conversion efficiency of 9.79% under simulated AM 1.5 sunlight (100 mW cm(-2)).
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