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|Title: ||Thermal Stability of Poly[2-methoxy-5-(2 '-phenylethoxy)-1,4-phenylenevinylene] (MPE-PPV):Fullerene Bulk Heterojunction Solar Cells|
|Authors: ||VANDENBERGH, Joke|
Van Assche, G.
Wienk, M. M.
Van Mele, B.
Janssen, R. A. J.
|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 (PCBM) blends were investigated by means of modulated temperature differential scanning calorimetry and rapid heating-cooling calorimetry. The thermal stability of MPE-PPV:  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:  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 (PCBM) resulted in a substantial increase of current density and power conversion efficiency, up to 3.0% for MDMO-PPV:PCBM and 2.3% for MPE-PPV: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.
|ISI #: ||000296308300013|
|Type: ||Journal Contribution|
|Validation: ||ecoom, 2012|
|Appears in Collections: ||Research publications|
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