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Issue Eur. Phys. J. Appl. Phys.
Volume 36, Number 3, December 2006
Page(s) 245 - 249
Section Nanomaterials and Nanotechnologies
DOI 10.1051/epjap:2006141

Eur. Phys. J. Appl. Phys. 36, 245-249 (2006)
DOI: 10.1051/epjap:2006141

Synthesis, characterization and application of donor-acceptor block copolymers in nanostructured bulk heterojunction solar cells

M. Sommer and M. Thelakkat

Applied Functional Polymers, University of Bayreuth, 95440 Bayreuth, Germany

Mukundan.Thelakkat@uni-bayreuth.de

(Received: 21 July 2006 / Received in final form: 25 September 2006 / Accepted: 11 October 2006 / Published online: 10 January 2007 )

Abstract
The synthesis and properties of two semiconducting donor-acceptor (D-A) block copolymers and their application in nanostructured bulk heterojunction solar cells are reported. The donor segments were obtained via nitroxide mediated polymerization of either bis(4-methoxyphenyl)-4'-vinylphenylamine or N,N'-bis(4-methoxyphenyl)-N-phenyl-N'-4-vinylphenyl-[1,1'biphenyl]-4,4'-diamine. Narrow-distributed macroinitiators, poly{bis(4-methoxyphenyl)-4'-vinylphenylamine} (PvDMTPA) and poly{N,N'-bis(4-methoxyphenyl)-N-phenyl-N'-4-vinylphenyl-[1,1'biphenyl]-4,4'-diamine} (PvDMTPD) were used to polymerize the acceptor monomer perylene diimide acrylate (PerAcr) to yield block copolymers with well-defined molecular weights. Different diblock copolymers, PvDMTPA-block-PPerAcr and PvDMTPD-block-PPerAcr, with high perylene diimide weight fractions were prepared. The block copolymers exhibited efficient fluorescence quenching. Transmission electron microscopy revealed wire-like and worm-like nanostructures throughout bulk samples. Thin film photovoltaic devices showed short circuit currents $J_{\it SC}$ of up to 1.21 mA/cm2 and power conversion efficiencies $\eta$ of 0.32% under AM 1.5 illumination conditions.

PACS
78.66.Qn - Polymers; organic compounds.
81.16.Dn - Self-assembly.
81.20.Ka - Chemical synthesis; combustion synthesis.

© EDP Sciences 2006


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