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Interfacial electron transfer dynamics and photovoltaic performance of TiO2 and ZnO solar cells sensitized with Coumarin 343

Paper ID Volume ID Publish Year Pages File Format Full-Text
26576 43964 2011 9 PDF Available
Title
Interfacial electron transfer dynamics and photovoltaic performance of TiO2 and ZnO solar cells sensitized with Coumarin 343
Abstract

In this work, the photovoltaic performance and interfacial electron transfer (IET) dynamics of Coumarin 343 (C343) on ZnO and TiO2 nanocrystalline semiconductors (sensitized films) were investigated using femtosecond upconversion spectroscopy. Inert Al2O3 nanostructured films were also used for comparison. In addition, electron transfer dynamics were studied in complete solar cells in the presence of a redox electrolyte in order to investigate the relation between electron transfer and solar cell performance. For the sensitized films, a more rapid IET was observed from C343 towards ZnO compared to TiO2. An IET efficiency of 0.90 and 0.81 from C343 to ZnO and TiO2 films respectively, was found at a transition corresponding to an emission wavelength of 480 nm. In the case of complete cells, electron transfer dynamics showed some retardation compared to the sensitized films. It is noteworthy that, in complete TiO2 cells the injection dynamics were much faster than in ZnO ones, in contrast to the results obtained for sensitized semiconductor films. However, TiO2 cells sensitized with C343 exhibited lower energy conversion efficiency than ZnO ones, indicating that faster injection is not always associated with better solar cell efficiency and that other factors, such as electron recombination, affect significantly the performance of the cells. Indeed, dark current measurements for ZnO and TiO2 cells have shown that the recombination of the injected electrons with accepting sites in the electrolyte occurs more rapidly in TiO2 cells, thus reducing their efficiency.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► We study electron transfer dynamics of C343 on ZnO and TiO2 films and solar cells. ► Femtosecond upconversion spectroscopy is used to investigate these processes. ► Retardation in injection dynamics is observed in solar cells compared to thin films. ► Electron injection is faster in ZnO than TiO2 films, but slower in ZnO solar cells. ► Lower efficiency of TiO2 cells is due to higher electron–hole recombination rates.

Keywords
Solar cell; Dye-sensitized; Electron transfer dynamics; Femtosecond spectroscopy; Coumarin 343
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Interfacial electron transfer dynamics and photovoltaic performance of TiO2 and ZnO solar cells sensitized with Coumarin 343
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 226, Issue 1, 15 December 2011, Pages 42–50
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