Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 2, Issue 6, Pages 1886-1896Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ta13597g
Keywords
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Funding
- Natural Science Foundation of China [21271146, 20871096]
- Fundamental Research Funds for the Central Universities of China [2081003]
- Key Lab of Novel Thin Film Solar Cells [KF201111]
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Size controllable and thermally stable rice-like brookite TiO2 particles with high phase purity were synthesized through a hydrothermal process. By varying the reaction conditions, the average diameter (brachyaxis) of the rice-like brookite TiO2 particles can be tuned over a wide range from ca. 200 nm to 1200 nm. Moreover, the brookite phase can be maintained, even with calcination at a temperature up to 800 degrees C, and a brookite-to-anatase phase transition and then to rutile can be observed upon further enhancing the calcination temperature from 850 degrees C to 1000 degrees C. The obtained brookite TiO2 submicrometer particles were used as a light scattering overlayer on a nano-sized TiO2 (P25) film-based photoanode to fabricate bilayer TiO2 film-based dye-sensitized solar cells (DSSCs). It is found that the brookite TiO2 scattering layers can improve the performances of the P25 film-based solar cells to different extents by enhancing the light-harvesting capability, and the optimal diameter of the rice-like brookite TiO2 particles as a scattering layer material is determined to be similar to 600 nm, its corresponding solar cell gives an overall conversion efficiency up to 7.57%, with a similar to 33% improvement in the efficiency as compared to that (5.70%) of the individual P25 film-based one under standard AM 1.5G 1 sun irradiation. The above results on the brookite TiO2 particles represent a clear advance towards efficient light scattering materials for the nanosized TiO2 film-based solar cells.
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