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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/9992

Title: On the origin of the open-circuit voltage of polymer-fullerene solar cells
Authors: VANDEWAL, Koen
Tvingstedt, Kristofer
GADISA, Abay
Inganas, Olle
MANCA, Jean
Issue Date: 2009
Publisher: NATURE PUBLISHING GROUP
Citation: NATURE MATERIALS, 8(11). p. 904-909
Abstract: The increasing amount of research on solution-processable, organic donor-acceptor bulk heterojunction photovoltaic systems, based on blends of conjugated polymers and fullerenes has resulted in devices with an overall power-conversion efficiency of 6%. For the best devices, absorbed photon-to-electron quantum efficiencies approaching 100% have been shown. Besides the produced current, the overall efficiency depends critically on the generated photovoltage. Therefore, understanding and optimization of the open-circuit voltage (V-oc) of organic solar cells is of high importance. Here, we demonstrate that charge-transfer absorption and emission are shown to be related to each other and V-oc in accordance with the assumptions of the detailed balance and quasi-equilibrium theory. We underline the importance of the weak ground-state interaction between the polymer and the fullerene and we confirm that V-oc is determined by the formation of these states. Our work further suggests alternative pathways to improve V-oc of donor-acceptor devices.
Notes: [Vandewal, Koen; Gadisa, Abay; Manca, Jean V.] Hasselt Univ, Inst Mat Res, Vzw, IMEC IMOMEC, B-3590 Diepenbeek, Belgium. [Tvingstedt, Kristofer; Inganas, Olle] Linkoping Univ, Dept Phys Chem & Biol, COE, S-58183 Linkoping, Sweden.
URI: http://hdl.handle.net/1942/9992
DOI: 10.1038/NMAT2548
ISI #: 000271050500021
ISSN: 1476-1122
Category: A1
Type: Journal Contribution
Validation: ecoom, 2010
Appears in Collections: Research publications

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