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Fullerene-grafted block copolymers used as compatibilizer in P3HT/PCBM bulk heterojunctions: morphology and photovoltaic performances

Published online by Cambridge University Press:  23 November 2011

V. Gernigon ,
P. Lévêque ,
C. Brochon ,
J.-N. Audinot ,
N. Leclerc ,
R. Bechara ,
F. Richard ,
T. Heiser  and
G. Hadziioannou
V. Gernigon
Affiliation:
Institut d’Électronique du Solide et des Systèmes (InESS), Université de Strasbourg, CNRS, 23 rue du Loess, 67037 Strasbourg, France
P. Lévêque
Affiliation:
Institut d’Électronique du Solide et des Systèmes (InESS), Université de Strasbourg, CNRS, 23 rue du Loess, 67037 Strasbourg, France
C. Brochon
Affiliation:
Laboratoire de Chimie des Polymères Organiques, École Nationale Supérieure de Chimie, de Biologie et de Physique, Université Bordeaux 1, 16 avenue Pey-Berland, 33607 Pessac, France
J.-N. Audinot
Affiliation:
Department Science and Analysis of Materials, Public Research Centre Gabriel Lippmann, 41 rue du Brill, 4422 Belvaux, Luxembourg
N. Leclerc
Affiliation:
Laboratoire d’Ingénierie des Polymères pour les Hautes Technologies (LIPHT), École Européenne de Chimie des Polymères et Matériaux (ECPM), 25 rue Becquerel, 67087 Strasbourg, France
R. Bechara
Affiliation:
Institut d’Électronique du Solide et des Systèmes (InESS), Université de Strasbourg, CNRS, 23 rue du Loess, 67037 Strasbourg, France
F. Richard
Affiliation:
Laboratoire d’Ingénierie des Polymères pour les Hautes Technologies (LIPHT), École Européenne de Chimie des Polymères et Matériaux (ECPM), 25 rue Becquerel, 67087 Strasbourg, France
T. Heiser*
Affiliation:
Institut d’Électronique du Solide et des Systèmes (InESS), Université de Strasbourg, CNRS, 23 rue du Loess, 67037 Strasbourg, France
G. Hadziioannou*
Affiliation:
Laboratoire de Chimie des Polymères Organiques, École Nationale Supérieure de Chimie, de Biologie et de Physique, Université Bordeaux 1, 16 avenue Pey-Berland, 33607 Pessac, France
*
ae-mail: thomas.heiser@unistra.fr
be-mail: hadzii@enscbp.fr
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Abstract

The nanostructure of the active layer in polymer/fullerene bulk heterojunction solar cells is known to have a strong impact on the device performances. Controlling the polymer/fullerene blend morphology is therefore particularly important. In this work, a rod-coil block copolymer, based on a regioregular poly(3-hexylthiophene) electron-donor rod block and a C60-grafted coil block, is used as compatibilizer and its influences on the thin film morphology as well as the photovoltaic performances are investigated. It is shown that a small fraction of compatibilizer can enhance the device performances in an otherwise non-optimized process. At higher fractions or long annealing times however, the fullerene-grafted copolymer is found to behave as a nucleation center and triggers the formation of fullerene crystals.

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 56 , Issue 3: Focus on organic electronic devices , December 2011 , 34107
Copyright
© EDP Sciences, 2011

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