Using the Stark effect to understand charge generation in organic solar cells

Jelissa De Jonghe-Risse, Martina Causa', Ester Buchaca-Domingo, Martin Heeney, Jacques E. Moser, Natalie Stingelin, Natalie Banerji

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Scopus citations

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.
Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
PublisherSPIEspie@spie.org
ISBN (Print)9781628417159
DOIs
StatePublished - Jan 1 2015
Externally publishedYes

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