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Title: Investigation of defects by admittance spectroscopy measurements in poly (3-hexylthiophene):(6,6)-phenyl C(61)-butyric acid methyl ester organic solar cells degraded under air exposure
Authors: Khelifi, Samira
Decock, Koen
Lauwaert, Johan
Vrielinck, Henk
Belghachi, Abderrahmane
Burgelman, Marc
Issue Date: 2011
Abstract: Electrical transport properties of poly (3-hexylthiophene) (P3HT) (6,6)-phenyl C(61)-butyric acid methyl ester (PCBM) solar cells, with and without encapsulation, have been investigated and analyzed using admittance spectroscopy and capacitance voltage measurements at different temperatures. The admittance spectroscopy clearly reveals two defect states with activation energies of 53 and 100 meV, and a concentration ten times higher in the unencapsulated sample. These defects seem to have a strong effect on the charge transport and the solar cell performance when they are present with a high concentration, since they lead to a decrease of the mobility and also the short-circuit current and the efficiency. The origin of these defects has been assigned to reaction of the blend with O(2) which is also known to induce p-type doping in pure P3HT. In an attempt to understand the effect of these defects on the organic solar cell performance, modeling and simulation were carried out using the effective medium layer model and gave good agreement with the measurements results. (C) 2011 American Institute of Physics. [doi:10.1063/1.3658023]
Notes: [Khelifi, Samira; Decock, Koen; Burgelman, Marc] Univ Ghent, Dept Elect & Informat Syst ELIS, B-9000 Ghent, Belgium. [Lauwaert, Johan; Vrielinck, Henk] Univ Ghent, Dept Solid State Sci, B-9000 Ghent, Belgium. [Spoltore, Donato; Piersimoni, Fortunato; Manca, Jean] Univ Hasselt, Inst Mat Res, B-3590 Diepenbeek, Belgium. [Belghachi, Abderrahmane] Univ Bechar, LPDS, Bechar 08000, Algeria. Samira.Khelifi@elis.ugent.be
URI: http://hdl.handle.net/1942/12908
DOI: 10.1063/1.3658023
ISI #: 000297062100119
ISSN: 0021-8979
Category: A1
Type: Journal Contribution
Validation: ecoom, 2012
Appears in Collections: Research publications

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