In Situ Optical Measurement of Charge Transport Dynamics in Organic Photovoltaics

We present a novel experimental approach which allows extraction of both spatial and temporal information on charge dynamics in organic solar cells. Using the wavelength dependence of the photonic structure in these devices, we monitor the change in spatial overlap between the photogenerated hole di...

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Bibliographic Details
Published in:Nano letters 2015-02, Vol.15 (2), p.931-935
Main Authors: Chow, Philip C. Y, Bayliss, Sam L, Lakhwani, Girish, Greenham, Neil C, Friend, Richard H
Format: Article
Language:English
Subjects:
Electrodes
Photochemical Processes
Solar Energy
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Summary:We present a novel experimental approach which allows extraction of both spatial and temporal information on charge dynamics in organic solar cells. Using the wavelength dependence of the photonic structure in these devices, we monitor the change in spatial overlap between the photogenerated hole distribution and the optical probe profile as a function of time. In a model system we find evidence for a buildup of the photogenerated hole population close to the hole-extracting electrode on a nanosecond time scale and show that this can limit charge transport through space-charge effects under operating conditions.
ISSN:1530-6984
1530-6992
DOI:10.1021/nl503687u