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Polymers 2016, 8(1), 4;

Improving the Performances of Random Copolymer Based Organic Solar Cells by Adjusting the Film Features of Active Layers Using Mixed Solvents

National Center for Nanoscience and Technology, Beijing 100190, China
Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry and Environment, Beihang University, Beijing 100191, China
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Academic Editor: Scott M. Husson
Received: 23 November 2015 / Revised: 20 December 2015 / Accepted: 24 December 2015 / Published: 29 December 2015
(This article belongs to the Special Issue Polymer Thin Films and Membranes 2015)
PDF [2292 KB, uploaded 29 December 2015]


A novel random copolymer based on donor–acceptor type polymers containing benzodithiophene and dithienosilole as donors and benzothiazole and diketopyrrolopyrrole as acceptors was designed and synthesized by Stille copolymerization, and their optical, electrochemical, charge transport, and photovoltaic properties were investigated. This copolymer with high molecular weight exhibited broad and strong absorption covering the spectra range from 500 to 800 nm with absorption maxima at around 750 nm, which would be very conducive to obtaining large short-circuits current densities. Unlike the general approach using single solvent to prepare the active layer film, mixed solvents were introduced to change the film feature and improve the morphology of the active layer, which lead to a significant improvement of the power conversion efficiency. These results indicate that constructing random copolymer with multiple donor and acceptor monomers and choosing proper mixed solvents to change the characteristics of the film is a very promising way for manufacturing organic solar cells with large current density and high power conversion efficiency. View Full-Text
Keywords: random copolymer; photovoltaic; mixed solvents; film feature random copolymer; photovoltaic; mixed solvents; film feature

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Zhu, X.; Lu, K.; Xia, B.; Fang, J.; Zhao, Y.; Zhao, T.; Wei, Z.; Jiang, L. Improving the Performances of Random Copolymer Based Organic Solar Cells by Adjusting the Film Features of Active Layers Using Mixed Solvents. Polymers 2016, 8, 4.

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