In-situ optical measurement of charge transport dynamics in organic photovoltaics
Chow, Philip CY
Bayliss, Sam L
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Chow, P. C., Bayliss, S. L., Lakhwani, G., Greenham, N. C., & Friend, R. H. (2015). In-situ optical measurement of charge transport dynamics in organic photovoltaics. Nano Letters, 15 931-935. https://doi.org/10.1021/nl503687u
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.
Photovoltaics, solar cells, organic, charge transport, optical spectroscopy, transient absorption
This work was supported by the EPSRC [Grant number EP/ G060738/1].
External DOI: https://doi.org/10.1021/nl503687u
This record's URL: https://www.repository.cam.ac.uk/handle/1810/247663