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Title: | Effect of temperature on the morphological and photovoltaic stability of bulk heterojunction polymer: fullerene solar cells | Authors: | BERTHO, Sabine Janssen, Griet CLEIJ, Thomas CONINGS, Bert MOONS, Wouter GADISA DINKU, Abay D'HAEN, Jan Goovaerts, E. LUTSEN, Laurence MANCA, Jean VANDERZANDE, Dirk |
Issue Date: | 2008 | Publisher: | ELSEVIER SCIENCE BV | Source: | SOLAR ENERGY MATERIALS AND SOLAR CELLS, 92(7). p. 753-760 | Abstract: | In high performance polymer: fullerene bulk heterojunction solar cells the nanoscale morphology of interpenetrating acceptor:donor materials is optimized through appropriate preparation conditions such as annealing and choice of solvent, but this initial state-of-the-art morphology will not remain stable during long-term operation. We report the effects of prolonged storage at elevated temperatures on both the morphology and the photovoltaic performance for the model systems MDMO-PPV:PCBM and P3HT:PCBM as compared to 'High T-g PPV':PCBM based solar cells, where the 'High Tg PPV' is characterized by its high glass transition temperature (138 degrees Q. In situ monitoring of the photocurrent-voltage characteristics at elevated temperatures, in combination with a systematic transmission electron microscopy (TEM) study and complementary optical spectroscopy, reveals distinct degradation kinetics and morphological changes that indicate the occurrence of different underlying physico-chemical mechanisms. (c) 2008 Elsevier B.V. All rights reserved. | Notes: | Hasselt Univ, Inst Mat Res, B-3590 Diepenbeek, Belgium. Univ Antwerp, Dept Phys, B-2610 Antwerp, Belgium. IMOMEC, IMEC VZW, B-3590 Diepenbeek, Belgium. | Keywords: | organic photovoltaics; thermal stability; glass transition temperature; morphology | Document URI: | http://hdl.handle.net/1942/8330 | ISSN: | 0927-0248 | e-ISSN: | 1879-3398 | DOI: | 10.1016/j.solmat.2008.01.006 | ISI #: | 000256121300008 | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2009 |
Appears in Collections: | Research publications |
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