Issue 38, 2013
From the journal:

Journal of Materials Chemistry A

Effects of a side chain sequence on surface segregation of regioregular poly(3-alkylthiophene) and interfacial modification of bilayer organic photovoltaic devices†

Yanfang Geng,a   Jusha Ma,bc   Qingshuo Wei,b   Kazuhito Hashimoto*b  and  Keisuke Tajima*de  

* Corresponding authors

a National Center for Nanoscience and Nanotechnology (NCNST), No. 11, Beiyitiao, Zhongguancun, Beijing, P.R. China

b Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
E-mail: hashimoto@light.t.u-tokyo.ac.jp

c Department of Materials, School of Materials, Beijing Institute of Technology, 5 South Zhongguancun Street, Haidian District, Beijing, P.R. China

d RIKEN Center for Emergent Matter Science (CEMS), Japan
E-mail: keisuke.tajima@riken.jp

e Japan Science and Technology Agency (JST), PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan

Abstract

A regioregular poly(3-alkylthiophene) with a statistical sequence of alkyl/semifluoroalkyl side chains (stat-P3DDFT) was synthesized through the copolymerization of mixed monomers. The surface segregation behavior was compared with the corresponding alternating copolymer (alt-P3DDFT) that forms highly ordered dipole layers by surface segregation. X-ray and ultraviolet photoelectron spectroscopies of the polymer films revealed that alt-P3DDFT formed a much more ordered surface segregated monolayer than did stat-P3DDFT, indicating the importance of the alternating sequence of the side chains. When stat-P3DDFT was inserted into the donor/acceptor interfaces in bilayer organic photovoltaic devices, the short circuit current and the open circuit voltages of the devices were related to the disordered interface structures of stat-P3DDFT.

Graphical abstract: Effects of a side chain sequence on surface segregation of regioregular poly(3-alkylthiophene) and interfacial modification of bilayer organic photovoltaic devices

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Article information

DOI
https://doi.org/10.1039/C3TA12297B
Article type
Paper
Submitted
13 Jun 2013
Accepted
02 Aug 2013
First published
21 Aug 2013

J. Mater. Chem. A, 2013,1, 11867-11873

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Effects of a side chain sequence on surface segregation of regioregular poly(3-alkylthiophene) and interfacial modification of bilayer organic photovoltaic devices

Y. Geng, J. Ma, Q. Wei, K. Hashimoto and K. Tajima, J. Mater. Chem. A, 2013, 1, 11867 DOI: 10.1039/C3TA12297B

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