Charge Transport Characteristics of High Efficiency Dye-Sensitized Solar Cells Based on Electrospun TiO2 Nanorod Photoelectrodes
- Charge Transport Characteristics of High Efficiency Dye-Sensitized Solar Cells Based on Electrospun TiO2 Nanorod Photoelectrodes
- 이병홍; 송미연; 장성연; 조성무; 곽승엽; 김동영
- dye-sensitized solar cell; electrospinning; TiO2 nanorod; electron transport
- Issue Date
- The journal of physical chemistry. C, Nanomaterials and Interfaces.
- VOL 113, NO 51, 21453-21457
- In this report, dye-sensitized solar cells (DSSCs) with high energy conversion efficiencies were fabricated
using TiO2 nanorods electrospun from a solution mixture of titanium n-propoxide and poly(vinyl acetate) in
dimethyl formamide. Investigation of the charge transport characteristics of this unique type of DSSC disclosed
that the efficiency of the DSSCs was enhanced by optimizing the nanorod morphology to facilitate charge
transport. Our TiO2 nanorods have an intrinsically higher sensitizer loading capability than conventional TiO2
nanoparticles and have much slower recombination lifetimes compared to conventional nanoparticles. Long
electron lifetime in nanorod electrode contributes to the enhanced effective photocarrier collection as well as
the conversion efficiency. The electron transport behavior of nanorod photoelectrodes was further improved
by TiCl4 post-treatment. The post-treatment reduces the pore volume of nanorod photoelectrodes while
improving inter-rod connectivity and enhancing electron diffusion. The electron diffusion coefficient of posttreated
nanorod was ∼51% higher than that of an untreated one, leading to a charge collection efficiency that
was 19% higher at a incident photonflux of 8.1 × 1016 cm-2 s-1. Finally, the efficiency of nanorod-based
DSSCs was optimized at a photoelectrode thickness of 14 μm to achieve 9.52% under masked illumination
of simulated solar light, AM 1.5 Global (Voc = 761 mV, Jsc = 17.6 mA cm-2, fill factor= 70.0%).
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