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http://hdl.handle.net/1942/1951
Title: | Photo-induced charge separation and electron diffusion in MDMO-PPV : PCBM bulk heterojunctions | Authors: | Quist, PAC MARTENS, Tom MANCA, Jean Savenije, TJ Siebbeles, LDA |
Issue Date: | 2006 | Publisher: | ELSEVIER SCIENCE BV | Source: | SOLAR ENERGY MATERIALS AND SOLAR CELLS, 90(3). p. 362-378 | Abstract: | The time-dependent photoconductivity of MDMO-PPV:PCBM blend films was studied using a microwave conductivity technique. The dependence of the photoconductivity on the weight fraction PCBM (W-PCBM) differs for the spin-coating solvents used, i.e. chlorobenzene (CB) or toluene. In the presence of PCBM-rich aggregates due to phase separation, the microwave conductivity is dominated by the electrons in the aggregates, resulting in a much slower decay. Despite large differences in morphology, the photoconductivity in films with W-PCBM = 0.75 spin-coated from CB is only three times higher than for the corresponding film from toluene. This is attributed to the large electron diffusion length within the MDMO-PPV:PCBM matrix (ca. 45 nm). Implications of the results for photovoltaic cells are discussed. (c) 2005 Elsevier B.V. All rights reserved. | Notes: | Delft Univ Technol, Opto Elect Mat Sect, NL-2629 JB Delft, Netherlands. Limburgs Univ Ctr, Inst Mat Res, B-3590 Diepenbeek, Belgium. IMEC vxw, Div IMOMEC, B-3590 Diepenbeek, Belgium.Quist, PAC, Delft Univ Technol, Opto Elect Mat Sect, Mekelweg 15, NL-2629 JB Delft, Netherlands.quist@iri.tudelft.nl | Keywords: | photovoltaic; MDMO-PPV; PCBM; morphology; photoconductivity | Document URI: | http://hdl.handle.net/1942/1951 | ISSN: | 0927-0248 | e-ISSN: | 1879-3398 | DOI: | 10.1016/j.solmat.2005.04.026 | ISI #: | 000234097200011 | Category: | A1 | Type: | Journal Contribution | Validations: | ecoom 2007 |
Appears in Collections: | Research publications |
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