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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/16365

Title: Effect of light induced degradation on electrical transport and charge extraction in polythiophene:Fullerene (P3HT:PCBM) solar cells
Authors: Khelifi, S.
Voroshazi, E.
SPOLTORE, Donato
PIERSIMONI, Fortunato
BERTHO, Sabine
Aernouts, Tom
MANCA, Jean
Lauwaert, J.
Vrielinck, H.
Burgelman, M.
Issue Date: 2014
Citation: SOLAR ENERGY MATERIALS AND SOLAR CELLS, 120, p. 244-252
Abstract: We investigate the photodegradation in inert atmosphere of (poly 3-hexylthiophene:[6,6]-phenyl-C61-butyric acid methyl ester) (P3HT:PCBM) heterojunction solar cells under continuous illumination using advanced electrical characterization and a device modeling tool. Our results indicate that different failure mechanisms contribute to the performance loss. The first 250 h of illumination induced p-type doping and recombination related to traps in the blend which mainly decreases the short-circuit current and the efficiency of the cells. Device modeling and simulation allowed us to prove that increased p-type doping of the blend provoke the loss in the short-circuit current and the quantum efficiency by simultaneous reduction of charge carrier mobility and the electric field together with a shrink of the space charge region. Transmission electron microscopy (TEM) measurements reveal a change in the blend morphology upon long illumination times manifested by phase segregation in the blend. The reduction in the open-circuit voltage is reported to be related to a slight reduction of the charge transfer energy (CT) upon 700 h of illumination aging. The final failure mechanism was a rapid drop in the fill factor which occurs upon 1000 h of illumination and manifested by the appearance of an S-shape J-V characteristic. This failure mechanism is linked to the reduction of charge extraction caused by a reduced surface recombination velocity at the contacts. (C) 2013 Elsevier B.V. All rights reserved.
Notes: Khelifi, S (reprint author), Univ Ghent, Dept Elect & Informat Syst ELIS, Sint Pietersnieuwstr 41, B-9000 Ghent, Belgium, samira.khelifi@elis.ugent.be
URI: http://hdl.handle.net/1942/16365
DOI: 10.1016/j.solmat.2013.09.010
ISI #: 000329595400032
ISSN: 0927-0248
Category: A1
Type: Journal Contribution
Validation: ecoom, 2015
Appears in Collections: Research publications

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