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Controlling donor crystallinity and phase separation in bulk heterojunction solar cells by the introduction of orthogonal solvent additives

Published online by Cambridge University Press:  08 May 2018

Shahidul Alam ,
Rico Meitzner ,
Christian Kaestner ,
Christoph Ulbricht ,
Stephanie Hoeppener ,
Daniel A.M. Egbe ,
Ulrich S. Schubert  and
Harald Hoppe
Shahidul Alam*
Affiliation:
Laboratory of Organic and Macromolecular Chemistry (IOMC), Friedrich Schiller University Jena, Humboldstrasse 10, 07743 Jena, Germany Center for Energy and Environmental Chemistry Jena (CEEC Jena), Friedrich Schiller University Jena, Philosophenweg 7a, 07743 Jena, Germany
Rico Meitzner
Affiliation:
Laboratory of Organic and Macromolecular Chemistry (IOMC), Friedrich Schiller University Jena, Humboldstrasse 10, 07743 Jena, Germany Center for Energy and Environmental Chemistry Jena (CEEC Jena), Friedrich Schiller University Jena, Philosophenweg 7a, 07743 Jena, Germany
Christian Kaestner
Affiliation:
Institute of Thermodynamics and Fluid Mechanics, Technische Universität Ilmenau, Am Helmholtzring 1, 98693 Ilmenau, Germany
Christoph Ulbricht
Affiliation:
Institute of Polymeric Materials and Testing, Johannes Kepler University, Altenbergerstrasse 69, 4040 Linz, Austria
Stephanie Hoeppener
Affiliation:
Laboratory of Organic and Macromolecular Chemistry (IOMC), Friedrich Schiller University Jena, Humboldstrasse 10, 07743 Jena, Germany Jena Centre for Soft Matter (JCSM), Friedrich Schiller University Jena Philosophenweg 7, 07743 Jena, Germany
Daniel A.M. Egbe
Affiliation:
Institute of Polymeric Materials and Testing, Johannes Kepler University, Altenbergerstrasse 69, 4040 Linz, Austria
Ulrich S. Schubert
Affiliation:
Laboratory of Organic and Macromolecular Chemistry (IOMC), Friedrich Schiller University Jena, Humboldstrasse 10, 07743 Jena, Germany Center for Energy and Environmental Chemistry Jena (CEEC Jena), Friedrich Schiller University Jena, Philosophenweg 7a, 07743 Jena, Germany
Harald Hoppe
Affiliation:
Laboratory of Organic and Macromolecular Chemistry (IOMC), Friedrich Schiller University Jena, Humboldstrasse 10, 07743 Jena, Germany Center for Energy and Environmental Chemistry Jena (CEEC Jena), Friedrich Schiller University Jena, Philosophenweg 7a, 07743 Jena, Germany
*
*Corresponding Author: Shahidul Alam, E-mail: [email protected]

Abstract

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The bulk heterojunction morphology of organic solar cells widely controls their device efficiency and stability. Structural order and domain size of the donor phase strongly impact the charge separation efficiency, recombination rates, and the hole percolation through the bulk to the electrode. Herewith, we report a comprehensive study on the control of polymeric order already initiated in solution by the introduction of orthogonal solvent additives to the common solution of anthracene containing poly(p-phenylene-ethynylene)-alt-poly(p-phenylene-vinylene) (PPE-PPV) copolymer, bearing statistically substituted linear octyloxy and 2-ethylhexyloxy side-chains in 1:1 ratio along the backbone (AnE-PVstat), and fullerene derivative phenyl-C61-butyric acid methyl ester (PCBM). The first solvent, a 1:1 blend of chlorobenzene and chloroform, had been discovered to promote phase separation in solution and deposited films. This effect could be further enhanced and was precisely controlled by addition of methanol to the common solution in various volume fractions. Thus the ability to transfer the polymer aggregates from the solution into films was applied to solar cells and is investigated in detail.

Keywords

optoelectronicphotovoltaicthin film
Type
Articles
Information
MRS Advances , Volume 3 , Issue 33: Electronics, Magnetics and Photonics , 2018 , pp. 1891 - 1900
Copyright
Copyright © Materials Research Society 2018 

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