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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/12914

Title: Thermal Stability of Poly[2-methoxy-5-(2 '-phenylethoxy)-1,4-phenylenevinylene] (MPE-PPV):Fullerene Bulk Heterojunction Solar Cells
Authors: VANDENBERGH, Joke
CONINGS, Bert
BERTHO, Sabine
KESTERS, Jurgen
SPOLTORE, Donato
Esiner, S.
Zhao, J.
Van Assche, G.
Wienk, M. M.
MAES, Wouter
LUTSEN, Laurence
Van Mele, B.
Janssen, R. A. J.
MANCA, Jean
VANDERZANDE, Dirk
Issue Date: 2011
Publisher: AMER CHEMICAL SOC
Citation: MACROMOLECULES, 44(21), p. 8470-8478
Abstract: To improve the thermal stability of polymer:fullerene bulk heterojunction solar cells, a new polymer, poly[2-methoxy-5-(2'-phenylethoxy)-1,4-phenylenevinylene] (MPE-PPV), has been designed and synthesized, which showed an increased glass transition temperature (T(g)) of 111 degrees C. The thermal characteristics and phase behavior of MPE-PPV:[6,6]-phenyl C(61)-butyric acid methyl ester ([60]PCBM) blends were investigated by means of modulated temperature differential scanning calorimetry and rapid heating-cooling calorimetry. The thermal stability of MPE-PPV: [60] PCBM solar cells was compared with devices based on the reference MDMO-PPV material with a T(g) of 45 degrees C. Monitoring of the photo-current-voltage characteristics at elevated temperatures revealed that the use of high-T(g) MPE-PPV resulted in a substantial improvement of the thermal stability of the solar cells. Furthermore, a systematic transmission electron microscope study of the active polymer:fullerene layer at elevated temperatures likewise demonstrated a more stable morphology for the MPE-PPV: [60] PCBM blend. Both observations indicate that the use of high-T(g) MPE-PPV as donor material leads to a reduced free movement of the fullerene molecules within the active layer of the photovoltaic device. Finally, optimization of the PPV:fullerene solar cells revealed that for both types of devices the use of [6,6]-phenyl C(71)-butyric acid methyl ester ([70]PCBM) resulted in a substantial increase of current density and power conversion efficiency, up to 3.0% for MDMO-PPV:[70]PCBM and 2.3% for MPE-PPV:[70]PCBM.
Notes: Vanderzande, DJM (reprint author),[Vandenbergh, J; Conings, B; Bertho, S; Kesters, J; Spoltore, D; Maes, W; Manca, J; Vanderzande, DJM] Hasselt Univ, Inst Mat Res IMO, B-3590 Diepenbeek, Belgium. [Esiner, S; Wienk, MM; Janssen, RAJ] Eindhoven Univ Technol, NL-5600 MB Eindhoven, Netherlands. [Zhao, J; Van Assche, G; Van Mele, B] Vrije Univ Brussel, Dept Mat & Chem, B-1050 Brussels, Belgium. [Maes, W] Katholieke Univ Leuven, B-3001 Heverlee, Belgium. [Lutsen, L; Manca, J; Vanderzande, DJM] IMEC, Div IMOMEC, B-3590 Diepenbeek, Belgium. dirk.vanderzande@uhasselt.be
URI: http://hdl.handle.net/1942/12914
DOI: 10.1021/ma201911a
ISI #: 000296308300013
ISSN: 0024-9297
Category: A1
Type: Journal Contribution
Validation: ecoom, 2012
Appears in Collections: Research publications

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