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Updated: Jun 12, 2026

Recombination Dynamics in Thin-film Photovoltaic Materials via Time-resolved Microwave Conductivity
Published on: March 6, 2017
Subnanosecond geminate charge recombination in polymer-polymer photovoltaic devices
Justin M Hodgkiss1, Andrew R Campbell, R Alex Marsh
1Cavendish Laboratory, Department of Physics, University of Cambridge, CB3 0HE, United Kingdom. Justin.Hodgkiss@vuw.ac.nz
Abstract:
We present direct spectroscopic evidence for substantial subnanosecond charge recombination in polymer-polymer blend photovoltaic devices. Early dynamics are dominated by exciton-charge interactions associated with high initial excitation densities. Independent of density, 30% of charges subsequently recombine geminately within just 2 nanoseconds, in contrast with fullerene blends. The remainder recombines with a half-life of approximately 200 ns. The morphological invariance of subnanosecond recombination suggests that its origin is inherent in the molecular structure at the polymer-polymer interface.
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