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Efficient Light Harvesting and Charge Collection of Dye-Sensitized Solar Cells with (001) Faceted Single Crystalline Anatase Nanoparticles
journal contribution
posted on 2012-09-13, 00:00 authored by Feng Hao, Xiao Wang, Chen Zhou, Xingjian Jiao, Xin Li, Jianbao Li, Hong LinWith a comparable specific surface area, 17% enhanced
dye-loading
capacity was observed for the first time in the (001) faceted TiO2 single crystals compared to that of benchmark P25 nanoparticles,
thus generating a significant enrichment in both short-circuit photocurrent
density and power conversion efficiency of dye-sensitized solar cells
(DSCs). Such a remarkably increased dye-loading capacity was primarily
ascribed to the higher density of 5-fold-coordinnated Ti atoms on
the (001) surfaces. Furthermore, kinetic studies revealed that such
single crystals confer a higher electron lifetime and charge collection
efficiency compared with conventional P25 electrode, which might originate
from the specific surface configuration in these high energetic facet
dominant single crystals. Our study provides straightforward evidence
for the superior reactivity of (001) facets and implies that such
single TiO2 crystals with high-energetic facets would be
a promising electrode material for DSCs.