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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/2428

Title: Nanostructured organic pn junctions towards 3D photovoltaics
Authors: MARTENS, Tom
MUNTERS, Tom
GORIS, Ludwig
D'HAEN, Jan
SCHOUTEDEN, Bram
D'OLIESLAEGER, Marc
LUTSEN, Laurence
VANDERZANDE, Dirk
Geens, W
Poortmans, J
DE SCHEPPER, Luc
MANCA, Jean
Issue Date: 2004
Publisher: SPRINGER-VERLAG
Citation: APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, 79(1). p. 27-30
Abstract: The working principle of so-called organic bulk heterojunction solar cells prepared with blends of poly(2-methoxy-5-(3',7'-dimethyl-octyloxy))-p-phenylene vinylene (MDMO-PPV), acting as an electron donor, and (6,6)-phenyl-C-61-butyric-acid methyl ester (PCBM) (a soluble C60 derivative), acting as electron acceptor, is based on the presence of three-dimensional nanostructured pn junctions and percolation paths for charge transport. At high PCBM contents, spontaneous phase separation occurs giving rise to PCBM-rich spherical/ellipsoidal regions (electron transport) embedded in a MDMO-PPV-rich matrix (hole transport). With transmission electron microscopy and scanning probe microscopy techniques it has been demonstrated that the size of the PCBM-rich region depends strongly on the preparation conditions such as solvents and drying conditions. The morphology of the active films in high-performance bulk heterojunction solar cells is characterized by a significantly higher number and a smaller size (nanoscale) of the PCBM-rich regions than for the low-performance cells. This morphology yields both an increase of the useful photoactive volume and an increase of the percolation paths for charge transport. Towards mature and high-performance organic-based three-dimensional photovoltaics, it is clear that besides mastering the electro-optical properties of the constituting materials it also of key importance to control the nanomorphology of the solid-state blends in order to obtain efficient interpenetrating pn networks.
Notes: Limburgs Univ Ctr, Inst Mat Onderzoek, B-3590 Diepenbeek, Belgium. IMEC, Div IMOMEC, B-3590 Diepenbeek, Belgium. IMEC, Div MCP, B-3590 Diepenbeek, Belgium. TU Eindhoven, Eindhoven, Netherlands.Manca, JV, Limburgs Univ Ctr, Inst Mat Onderzoek, Wetenschaps Pk 1,Univ Campus, B-3590 Diepenbeek, Belgium.jean.manca@luc.ac.be
URI: http://hdl.handle.net/1942/2428
DOI: 10.1007/s00339-003-2497-6
ISI #: 000220385600004
ISSN: 0947-8396
Category: A1
Type: Journal Contribution
Validation: ecoom, 2005
Appears in Collections: Research publications

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