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Fluorine substituent effect on organic dyes for sensitized solar cells

Paper ID Volume ID Publish Year Pages File Format Full-Text
27118 44002 2012 8 PDF Available
Title
Fluorine substituent effect on organic dyes for sensitized solar cells
Abstract

Two sets of organic dyes containing a stilbene backbone with fluorine substituents were designed for a study on the quantum efficiency of dye-sensitized solar cells (DSSCs). The results revealed that adding a fluorine substituent on the phenyl group ortho to the cyanoacrylate can enhance the light-harvesting performance in comparison with the unsubstituted one. However, when the two ortho-positions were both substituted by fluorine atoms, the performance of DSSCs was substantially reduced. The reason was mainly ascribed to a distortion from a planar geometry caused by steric hindrance. The π-conjugation was therefore disturbed, and the result led to a substantial reduction of the short-circuit photocurrent density (Jsc). Another effect was found that the open-circuit photovoltage (Voc) of the doubly substituted derivative was lower than that of the mono-substituted one. The more flexible conformation of the difluoro-substituted dyes induced an undesired nonradiative decay, therefore led to a reduction of open-circuit photovoltage. The phenomenon can be verified by electrochemical impendence spectrum. The non-planar geometry was realized by a computation using the density function theory (DFT) model. The slight blue shift of absorption band was also consistent with the calculated transition energy by a time dependent DFT model.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Dyes containing a stilbene backbone with fluorine substituents were designed for a study on the quantum efficiency of DSSCs. ► Adding a fluorine substituent on the phenyl group ortho to the cyanoacrylate can enhance the light-harvesting performance in comparison with the unsubstituted one. ► When the two ortho-positions were both substituted by fluorine atoms, the performance of DSSCs was substantially reduced. ► A distortion from a planar geometry caused by steric hindrance led to a substantial reduction of the short-circuit photocurrent density.

Keywords
Dye-sensitized solar cell; Stilbene; Fluorine substituted spacer; Charge transfer
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 230, Issue 1, 15 February 2012, Pages 47–54
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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Price was $35.95
You save - $31
Price after discount Only $4.95
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