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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/18691

Title: Understanding Triplet Formation Pathways in Bulk Heterojunction Polymer: Fullerene Photovoltaic Devices
Authors: Tedlla, Biniam Zerai
Zhu, Feng
Cox, Matthijs
DRIJKONINGEN, Jeroen
MANCA, Jean
Koopmans, Bert
Goovaerts, Etienne
Issue Date: 2015
Publisher: WILEY-V C H VERLAG GMBH
Citation: ADVANCED ENERGY MATERIALS, 5 (2)
Abstract: Triplet exciton (TE) formation pathways are systematically investigated in prototype bulk heterojunction (BHJ) super yellow poly(p-phenylene vinylene) (SY-PPV) solar cell devices with varying fullerene compositions using complementary optoelectrical and electrically detected magnetic resonance (EDMR) spectroscopies. It is shown that EDMR spectroscopy allows the unambiguous demonstration of fullerene triplet production in BHJ polymer:fullerene solar cells. EDMR triplet detection under selective photoexcitation of each blend component and of the interfacial charge transfer (CT) state reveals that low lying fullerene TEs are produced by direct intersystem crossing from singlet excitons (SEs). The direct CT-TE recombination pathway, although energetically feasible, is kinetically suppressed in these devices. However, high energy CT states in the CT manifold can contribute to the population of the fullerene triplet state via a direct CT-SE conversion. This undesirable energetic alignment could be one of the causes for the severe reduction in photocurrent observed when the open-circuit voltage of polymer:fullerene solar cells is pushed to 1.0 V or beyond.
Notes: [Tedlla, Biniam Zerai; Goovaerts, Etienne] Univ Antwerp, Dept Phys, B-2610 Antwerp, Belgium. [Zhu, Feng; Cox, Matthijs; Koopmans, Bert] Eindhoven Univ Technol, Dept Appl Phys, Ctr Nanomat CNM, NL-5600 MB Eindhoven, Netherlands. [Drijkoningen, Jeroen; Manca, Jean] Hasselt Univ, Grp ONE2, B-3590 Diepenbeek, Hasselt, Belgium. B.Koopmans@tue.nl; Etienne.Goovaerts@uantwerp.be
URI: http://hdl.handle.net/1942/18691
DOI: 10.1002/aenm.201401109
ISI #: 000348772600012
ISSN: 1614-6832
Category: A1
Type: Journal Contribution
Validation: ecoom, 2016
Appears in Collections: Research publications

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