Loss mechanisms in organic solar cells based on perylene diimide acceptors studied by time-resolved photoluminescence
Howard, Ian A.
Arndt, Andreas P.
KAUST DepartmentKAUST Solar Center (KSC)
Material Science and Engineering Program
Physical Science and Engineering (PSE) Division
Permanent link to this recordhttp://hdl.handle.net/10754/618026
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AbstractIn 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.
CitationMarina Gerhard ; Dominik Gehrig ; Ian A. Howard ; Andreas P. Arndt ; Mühenad Bilal ; Arash Rahimi-Iman ; Uli Lemmer ; Frédéric Laquai and Martin Koch " Loss mechanisms in organic solar cells based on perylene diimide acceptors studied by time-resolved photoluminescence ", Proc. SPIE 9895, Organic Photonics VII, 98950H (April 27, 2016); doi:10.1117/12.2227672; http://dx.doi.org/10.1117/12.2227672
SponsorsFinancial support of this contribution from the German Academic Exchange Service (DAAD) is gratefully acknowledged.
PublisherSPIE-Intl Soc Optical Eng
JournalOrganic Photonics VII
Conference/Event nameOrganic Photonics VII