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Title: Effect of Polymer Crystallinity in P3HT:PCBM Solar Cells on Band Gap Trap States and Apparent Recombination Order
Authors: SPOLTORE, Donato
Khelifi, Samira
Clifford, John N.
Viterisi, Aurelien
Palomares, Emilio
Burgelman, Marc
LUTSEN, Laurence
Issue Date: 2013
Citation: ADVANCED ENERGY MATERIALS, 3 (4), p. 466-471
Abstract: The non-geminate recombination of charge carriers in polymer-fullerene solar cells has been modeled in the last few years with a trap-assisted recombination model, which states that the apparent recombination order depends on the concentration of trapped charges tailing into the band gap. Higher concentrations of trapped charges lead to higher apparent recombination orders. In this work, the mass fraction f of highly crystalline nanofibrillar P3HT to the total P3HT content in P3HT:PCBM solar cells is consistently varied, controlling the temperature of a nanofibers-P3HT casting dispersion. A systematic study of the apparent recombination order, measured with a transient photovoltage technique, as a function of f is presented. A correlation is shown between the apparent recombination order, the P3HT crystallinity, and the trap concentration in the band gap measured with an admittance spectroscopy technique.
Notes: Spoltore, D (reprint author) Univ Hasselt, Inst Mat Res IMO, Div IMOMEC, IMEC, B-3590 Diepenbeek, Belgium. Univ Ghent, Dept Elect & Informat Syst ELIS, B-9000 Ghent, Belgium. Inst Chem Res Catalonia ICIQ, Tarragona 43007, Spain. ICREA, Barcelona 80810, Spain. donato.spoltore@uhasselt.be
URI: http://hdl.handle.net/1942/15181
DOI: 10.1002/aenm.201200674
ISI #: 000317430700010
ISSN: 1614-6832
Category: A1
Type: Journal Contribution
Validation: ecoom, 2014
Appears in Collections: Research publications

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