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Proceedings Paper

Transient absorption spectroscopy of ultra-low band gap polymers for organic electronic applications
Author(s): Kealan J. Fallon; Stoichko Dimitrov; James Durrant; Hugo Bronstein; Tracey M. Clarke
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Paper Abstract

In this paper two extremely narrow band-gap polymers, based on naturally occurring indigo with high thin film crystallinity, have been examined using transient absorption spectroscopy. This was done in order to assess their charge photogeneration and recombination characteristics in blends with PC71BM. Two charge photogeneration mechanisms are found to be operating, depending on which component of the blend is photoexcited. Despite virtually isoenergetic LUMO levels, photoexcitation of the polymer causes standard electron transfer, albeit with a relatively low efficiency of 17 %. Photoexcitation of the fullerene, however, produces an exceptionally slow nanosecond timescale hole transfer.

Paper Details

Date Published: 26 September 2016
PDF: 8 pages
Proc. SPIE 9923, Physical Chemistry of Interfaces and Nanomaterials XV, 992318 (26 September 2016); doi: 10.1117/12.2237629
Show Author Affiliations
Kealan J. Fallon, Univ. College London (United Kingdom)
Stoichko Dimitrov, Imperial College London (United Kingdom)
James Durrant, Imperial College London (United Kingdom)
Hugo Bronstein, Univ. College London (United Kingdom)
Tracey M. Clarke, Univ. College London (United Kingdom)


Published in SPIE Proceedings Vol. 9923:
Physical Chemistry of Interfaces and Nanomaterials XV
Artem A. Bakulin; Robert Lovrincic; Natalie Banerji, Editor(s)

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