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Proceedings Paper

Using the Stark effect to understand charge generation in organic solar cells
Author(s): Jelissa De Jonghe-Risse; Martina Causa'; Ester Buchaca-Domingo; Martin Heeney; Jacques-E. Moser; Natalie Stingelin; Natalie Banerji
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Paper Abstract

We have used a femtosecond-resolved spectroscopic technique based on the Stark effect (electromodulated differential absorption) in order to investigate free charge generation and charge drift in solar cell devices of neat conjugated polymer pBTTT and in its 1:1 (by weight) blend with PCBM. In the latter, the fullerene molecules intercalate between the polymer side-chains, yielding a co-crystal phase. Our results show that free charge generation in both materials is ultrafast and strongly dependent on the applied reverse bias. Charge drift to the electrodes (under strong reverse bias) occurs with comparable dynamics on the 1.2 ns time scale for neat pBTTT and the blend, and is probably dominated by hole transport within/between polymer chains.

Paper Details

Date Published: 20 August 2015
PDF: 6 pages
Proc. SPIE 9549, Physical Chemistry of Interfaces and Nanomaterials XIV, 95490J (20 August 2015); doi: 10.1117/12.2190212
Show Author Affiliations
Jelissa De Jonghe-Risse, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Martina Causa', Univ. of Fribourg (Switzerland)
Ester Buchaca-Domingo, Imperial College London (United Kingdom)
Martin Heeney, Imperial College London (United Kingdom)
Jacques-E. Moser, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Natalie Stingelin, Imperial College London (United Kingdom)
Natalie Banerji, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Univ. of Fribourg (Switzerland)

Published in SPIE Proceedings Vol. 9549:
Physical Chemistry of Interfaces and Nanomaterials XIV
Sophia C. Hayes; Eric R. Bittner, Editor(s)

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