In situ optical measurement of charge transport dynamics in organic photovoltaics.
Change log
Authors
Chow, Philip CY
Bayliss, Sam L
Lakhwani, Girish
Greenham, Neil C
Friend, Richard H
Abstract
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.
Description
Keywords
Photovoltaics, charge transport, optical spectroscopy, organic, solar cells, transient absorption, Electrodes, Photochemical Processes, Solar Energy
Journal Title
Nano Lett
Conference Name
Journal ISSN
1530-6984
1530-6992
1530-6992
Volume Title
15
Publisher
American Chemical Society (ACS)
Publisher DOI
Sponsorship
Engineering and Physical Sciences Research Council (EP/G060738/1)
This work was supported by the EPSRC [Grant number EP/
G060738/1].