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20 August 2015 Using the Stark effect to understand charge generation in organic solar cells
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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.
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Jelissa De Jonghe-Risse, Martina Causa', Ester Buchaca-Domingo, Martin Heeney, Jacques-E. Moser, Natalie Stingelin, and Natalie Banerji "Using the Stark effect to understand charge generation in organic solar cells", Proc. SPIE 9549, Physical Chemistry of Interfaces and Nanomaterials XIV, 95490J (20 August 2015);

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