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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 | Source: | 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. | Document URI: | http://hdl.handle.net/1942/9992 | ISSN: | 1476-1122 | e-ISSN: | 1476-4660 | DOI: | 10.1038/NMAT2548 | ISI #: | 000271050500021 | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2010 |
Appears in Collections: | Research publications |
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