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Electron dynamics dependence on optimum dye loading for an efficient dye-sensitized solar cell

Paper ID Volume ID Publish Year Pages File Format Full-Text
27579 44030 2011 6 PDF Available
Title
Electron dynamics dependence on optimum dye loading for an efficient dye-sensitized solar cell
Abstract

Increasing surface area and optimum dye loading are among the prerequisites for an efficient TiO2-based dye-sensitized solar cell (DSC), since they improve light harvesting but, at the same time, affect, in a variant way the electron dynamics in the semiconductor. Into this context, in this work, the interdependence of these two effects was investigated. The thermal annealing conditions of nanocrystalline titania films were modified between 400 and 550 °C in order to vary the crystallinity and the aggregation/sintering degree of the semiconductor particles. The annealing effects on the structural and surface parameters of the films were determined and the electron dynamics inside the semiconductor were elucidated. The film properties were found to correlate with the photoelectric conversion efficiencies of the corresponding DSCs in terms of light harvesting efficiency, electron transport, recombination and trapping at surface states. Despite higher dye loading, a relatively low efficiency (5.3%) was attained at the temperature of 400 °C, due to insufficient neck growth and the presence of surface states that were not removed by annealing. On the contrary, the highest efficiency (6.4%) was attained at 550 °C, where high values of electron diffusion coefficients and enhanced electron lifetimes were observed despite a significantly lower dye loading. The above results point out the significance of properly controlling both light harvesting and electron dynamics in the photoelectrode for efficient dye sensitization of a large band gap semiconductor.

Keywords
Titania annealing; Electron transport; Recombination; Dye loading; Dye-sensitized solar cells
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Electron dynamics dependence on optimum dye loading for an efficient dye-sensitized solar cell
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 217, Issue 1, 1 January 2011, Pages 236–241
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us