Free Charge Generation via CT States in a Highly Crystalline NFA-based Organic Solar Cells
Hyojung Cha a, James Durrant a
a Department of Chemistry, Imperial College London, South Kensington Campus London, London, United Kingdom
Proceedings of Online International Conference on Hybrid and Organic Photovoltaics (OnlineHOPV20)
Online, Spain, 2020 May 26th - 29th
Organizers: Tracey Clarke, James Durrant, Annamaria Petrozza and Trystan Watson
Poster, Hyojung Cha, 127
Publication date: 22nd May 2020

Herein we have investigate the morphology and exciton/charge carrier dynamics in bulk heterojunctions (BHJs) of the donor polymer PTQ10 and molecular acceptor IDIC. PTQ10:IDIC BHJs have been shown to be particularly promising for low cost organic solar cells (OSCs). We find that both PTQ10 and IDIC show remarkably high crystallinity in optimised BHJs, with GIWAXS data indicating p-p stacking coherence lengths of up to 8 nm. Transient absorption data indicate exciton separation leads to the formation of two spectrally distinct species, assigned to interfacial charge transfer (CT) states and separated charges. CT state decay is correlated with the appearance of additional separate charges, indicating relatively efficient CT state dissociation, attributed to the high crystallinity of this blend. Our results emphasis the potential for high material crystallinity to enhance charge separation and collection in OSCs, but also that long exciton diffusion lengths are likely to be essential for efficient exciton separation in such high crystallinity devices.

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