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Ultrafast and fast charge separation processes in real dye-sensitized solar cells

Paper ID Volume ID Publish Year Pages File Format Full-Text
31431 44785 2016 30 PDF Available
Title
Ultrafast and fast charge separation processes in real dye-sensitized solar cells
Abstract

•Time-resolved spectroscopic studies of dye-sensitized solar cells (DSSCs).•Correlation of the DSSCs performance with the fast and ultrafast processes.•Optimization of DSSCs performance based on its time-resolved working scheme.

The increasing global energy consumption and the simultaneous non-renewable resources depletion with their rising contamination levels, make the present energy scenario unsustainable. Among all the renewable energies, the sun's energy through its direct conversion into electricity is one of the best alternatives. In particular, since 1991 dye-sensitized solar cells (DSSCs) have attracted considerable interest from the scientific and commercial communities due to their promising characteristics as solar light converters. Nevertheless, even though there have been many efforts to increase the photoconversion efficiency through the photovoltaic parameters improvement using novel materials and device construction approaches, the efficiency and stability are still open challenges. On this regard, several approaches and techniques are being used to analyze the dependence of the overall efficiency on these parameters. In particular, the fast and ultrafast time-resolved spectroscopy techniques have provided advances towards unraveling the rate constants and quantum yields of the individual processes taking place in sensitized films in air as well as in complete DSSCs. Thus, the aim of this review is to discuss the main recent findings and the importance of the application of these techniques to understand why certain complete DSSC configurations have been more successful than others in terms of good sunlight conversion efficiencies, as well as to draw the basic guidelines on how to make further improvements in DSSCs. We firmly believe that new advances in this research area using ultrafast laser-based spectroscopy will not only help to discover fundamental and yet unknown information about these devices, but will also have impact on related topics like photocatalysis and photonics, supporting both technologies’ development and contributing to the growth of the fundamental knowledge on interactions among photons, electrons and materials.

Graphical abstractInduced fast and ultrafast photophysical events in DSSCs (1) photoexcitation, (2) electron injection (fs), (3) electron diffusion (ms), (4) dye-regeneration (μs), (5) dye excited-state decay to the ground-state, (6) and (7) electron recombination via sensitizer (ms) or via electrolyte (ps–μs).Figure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Dye-sensitized solar cells; Time-resolved spectroscopy; Electron transfer; Electron injection; Dye regeneration; Charge recombination; Photocurrent efficiency
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology C: Photochemistry Reviews - Volume 26, March 2016, Pages 1–30
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