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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 | Source: | 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 | Keywords: | polymers; fullerene; triplet excitons; charge transfer; energy transfer;polymers; fullerene; triplet excitons; charge transfer; energy transfer | Document URI: | http://hdl.handle.net/1942/18691 | ISSN: | 1614-6832 | e-ISSN: | 1614-6840 | DOI: | 10.1002/aenm.201401109 | ISI #: | 000348772600012 | Rights: | © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2016 |
Appears in Collections: | Research publications |
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Adv-energy-material-revised-main.doc | Peer-reviewed author version | 639 kB | Microsoft Word | View/Open |
Advanced Energy Materials - 2014 - Tedlla - Understanding Triplet Formation Pathways in Bulk Heterojunction Polymer.pdf Restricted Access | Published version | 1.64 MB | Adobe PDF | View/Open Request a copy |
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