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Correlation between the open circuit voltage and the energetics of organic bulk heterojunction solar cells

  • A detailed investigation of the open circuit voltage (V-OC) of organic bulk heterojunction solar cells comprising three different donor polymers and two different fullerene-based acceptors is presented. Bias amplified charge extraction (BACE) is combined with Kelvin Probe measurements to derive information on the relevant energetics in the blend. On the example of P3HT:PC70BM the influence of composition and preparation conditions on the relevant transport levels will be shown. Moderate upward shifts of the P3HT HOMO depending on crystallinity are observed, but contrarily to common believe, the dependence of V-OC on blend composition and thermal history is found to be largely determined by the change in the PCBM LUMO energy. Following this approach, we quantified the energetic contribution to the V-OC in blends with fluorinated polymers or higher adduct fullerenes.

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Author:Ilja Lange, Juliane Kniepert, Patrick Pingel, Ines Dumsch, Sybille Allard, Silvia JanietzORCiDGND, Ullrich Scherf, Dieter NeherORCiDGND
Parent Title (English):The journal of physical chemistry letters
Publisher:American Chemical Society
Place of publication:Washington
Document Type:Article
Year of first Publication:2013
Year of Completion:2013
Release Date:2017/03/26
First Page:3865
Last Page:3871
Funder:Deutsche Forschungsgemeinschaft (DFG) within the Collaborative Research Centre HIOS [SFB 951]; German Ministry of Science and Education [FKZ 03IS2151D]; [SPP 1355]
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie
Peer Review:Referiert