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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/1952

Title: Optical absorption by defect states in organic solar cells
Authors: GORIS, Ludwig
Poruba, A
Purkrt, A
VANDEWAL, Koen
SWINNEN, Ann
HAELDERMANS, Ilse
HAENEN, Ken
MANCA, Jean
Vanecek, M
Issue Date: 2006
Publisher: ELSEVIER SCIENCE BV
Citation: JOURNAL OF NON-CRYSTALLINE SOLIDS, 352(9-20). p. 1656-1659
Abstract: Organic bulk heterojunction solar cells enjoy a well established reputation, reaching conversion efficiencies up to 4% at present. Information on electronic states in the gap, whether or not connected with defects, that can influence the power conversion efficiency, are still lacking. A photoelectrical study of the optical absorption processes in encapsulated cells is presented. Fourier-transform photocurrent spectroscopy is used to measure the transitions connected with free charge carrier generation. The dynamic range obtained with this method reaches over at least eight orders of magnitude. Measurements on solar cells with an active layer of MDMO-PPV:PCBM (1:4 weight ratio) enabled a study of the intrinsic defect generation due to UV-illumination. Temperature annealing effects in P3HT:PCBM (1:2 weight ratio) cells and the induced morphological changes are related with the changes in absorption spectrum. These morphological changes were separately probed with optical and transmission electron microscopy. (c) 2006 Elsevier B.V. All rights reserved.
Notes: Hasselt Univ, Mat Res Inst, B-3590 Diepenbeek, Belgium. Acad Sci Czech Republ, Inst Phys, CR-16200 Prague 6, Czech Republic. IMEC VZW, Div IMOMEC, B-3590 Diepenbeek, Belgium.Goris, L, Hasselt Univ, Mat Res Inst, Wetenschapspk 1, B-3590 Diepenbeek, Belgium.ludwig.goris@uhasselt.be
URI: http://hdl.handle.net/1942/1952
DOI: 10.1016/j.jnoncrysol.2005.09.053
ISI #: 000238782900189
ISSN: 0022-3093
Category: A1
Type: Journal Contribution
Validation: ecoom, 2007
Appears in Collections: Research publications

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