Loss mechanisms in organic solar cells based on perylene diimide acceptors studied by time-resolved photoluminescence

Marina Gerhard, Dominik Gehrig, Ian A. Howard, Andreas P. Arndt, Mühenad Bilal, Arash Rahimi-Iman, Uli Lemmer, Frédéric Laquai, Martin Koch

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

Abstract

In organic photovoltaics (OPV), perylene diimide (PDI) acceptor materials are promising candidates to replace the commonly used, but more expensive fullerene derivatives. The use of alternative acceptor materials however implies new design guidelines for OPV devices. It is therefore important to understand the underlying photophysical processes, which either lead to charge generation or geminate recombination. In this contribution, we investigate radiative losses in a series of OPV materials based on two polymers, P3HT and PTB7, respectively, which were blended with different PDI derivatives. Our time-resolved photoluminescence measurements (TRPL) allow us to identify different loss mechanisms by the decay characteristics of several excitonic species. In particular, we find evidence for unfavorable morphologies in terms of large-scale pure domains, inhibited exciton transport and incomplete charge transfer. Furthermore, in one of the P3HT-blends, an interfacial emissive charge transfer (CT) state with strong trapping character is identified. © (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Original languageEnglish (US)
Title of host publicationOrganic Photonics VII
PublisherSPIE-Intl Soc Optical Eng
ISBN (Print)9781510601406
DOIs
StatePublished - Apr 27 2016

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