Please use this identifier to cite or link to this item: 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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