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Title: | Charge transfer in the weak driving force limit in blends of MDMO-PPV and dithienylthiazolo[5,4-d]thiazoles towards organic photovoltaics with high V-OC | Authors: | Nevil, Nissy Ling, Yun VAN MIERLOO, Sarah KESTERS, Jurgen PIERSIMONI, Fortunato ADRIAENSENS, Peter LUTSEN, Laurence VANDERZANDE, Dirk MANCA, Jean MAES, Wouter VAN DOORSLAER, Sabine Goovaerts, Etienne |
Issue Date: | 2012 | Publisher: | ROYAL SOC CHEMISTRY | Source: | PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 14 (45), p. 15774-15784 | Abstract: | A series of three 5'-aryl-2,5-dithienylthiazolo[5,4-d]thiazole (DTTzTz) semiconducting molecules with different aryl substituents has been investigated as alternative acceptor materials in combination with the donor polymer poly[2-methoxy-5-(3',7'-dimethyloctyloxy)-1,4-phenylene vinylene] (MDMO-PPV) in order to evaluate the photoinduced charge transfer (CT) efficiency in the resulting blends, designed towards possible application in organic photovoltaics. Photoluminescence quenching together with polaron detection by electron paramagnetic resonance and photoinduced absorption (PIA) demonstrate an increasing charge transfer efficiency when the DTTzTz substituents are varied from thien-2-yl to 4-trifluoromethylphenyl and 4-cyanophenyl groups, correlating well with the increasing acceptor strength in this series of molecules. In line with this observation, there is a decrease in the effective optical bandgap relative to pure MDMO-PPV that becomes more pronounced along this series of acceptor compounds, reaching 0.12 eV in the blend with 4-CN-Ph-DTTzTz. Intermolecular interactions between the blend components lead to lower energy transitions which are found to contribute significantly to the device external quantum efficiency. The high V-OC reached in devices based on MDMO-PPV: 4-CN-Ph-DTTzTz blends meets the expectations for such a donor: acceptor combination. However, thermal activation of charge carrier recombination occurs because of the weak driving force for charge transfer, as shown by time-dependent PIA measurements, and this is suggested as a cause for the observed low photovoltaic performance. | Notes: | [Nevil, Nissy; Ling, Yun; Van Doorslaer, Sabine; Goovaerts, Etienne] Univ Antwerp, Dept Phys, B-2610 Antwerp, Belgium. [Piersimoni, Fortunato; Manca, Jean] Hasselt Univ, Inst Mat Res IMO IMOMEC, Organ Nanostruct Elect & Energy Convers ONE2, B-3590 Diepenbeek, Belgium. [Lutsen, Laurence; Vanderzande, Dirk] IMOMEC Ass Lab, IMEC, B-3590 Diepenbeek, Belgium. | Keywords: | Chemistry, Physical; Physics, Atomic, Molecular & Chemical; photoinduced electron-transfer; heterojunction solar cells; open circuit voltage; nuclear double-resonance; field-effect transistors; conjugated polymers; small-molecule; photoexcitation spectroscopy; absorption-spectroscopy; acceptor materials | Document URI: | http://hdl.handle.net/1942/14451 | ISSN: | 1463-9076 | e-ISSN: | 1463-9084 | DOI: | 10.1039/c2cp42399e | ISI #: | 000310460400019 | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2013 |
Appears in Collections: | Research publications |
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Charge transfer in the weak driving force limit in blends of MDMO-PPV.pdf | 2.37 MB | Adobe PDF | View/Open |
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