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Title: Enhancement of the Power Conversion Efficiency in Organic Photovoltaics by Unveiling the Appropriate Polymer Backbone Enlargement Approach
Authors: Chochos, Christos L. 
Singh, Ranbir R. 
Kim, Min 
Gasparini, Nicola 
Katsouras, Athanasios 
Kulshreshtha, Chandramouli 
Gregoriou, Vasilis G. 
Keivanidis, Panagiotis E. 
Ameri, Tayebeh 
Brabec, Christoph 
Cho, Kilwon 
Avgeropoulos, Apostolos 
Major Field of Science: Engineering and Technology
Field Category: Mechanical Engineering
Keywords: Morphology;Organic electronics;Polymer semiconductors;Supramolecular assembly;Recombination dynamics
Issue Date: 15-Mar-2016
Source: Advanced Functional Materials, 2016, vol. 26, no. 11, pp. 1840-1848
Volume: 26
Issue: 11
Start page: 1840
End page: 1848
Journal: Advanced Functional Materials 
Abstract: Optoelectronic properties, supramolecular assemblies, and morphology variation of polymeric semiconductors are governed by six fundamental chemical features. These features are molecular weight, bond length alternation (BLA), planarity, aromatic resonance energy, substituents, and intermolecular interactions. Of these features the specific role of BLA in determining the performance of a polymeric semiconductor in practical technological applications is so far unknown. This study investigates this question and reports the novel finding that the optoelectronic, microscopic (supramolecular packing), and macroscopic (morphology variation and device performance) properties of model semiconducting polymers depend on the conjugated polymer backbone enlargement, which is directly related to the BLA. Extensive studies are performed in both single-component polymer films and their blends with fullerene derivatives. Understanding the specific structure-properties relations will lead to significant advancement in the area of organic electronics, since it will set new design rules toward further optimization of polymer chemical structures to enhance the device performances. An efficient way to enlarge the polymer backbone of an electron donor conjugated polymer toward higher organic photovoltaic performance is presented.
ISSN: 1616-301X
DOI: 10.1002/adfm.201504953
Rights: © WILEY
Type: Article
Affiliation : University of Ioannina 
Pohang University of Science and Technology 
Friedrich-Alexander-Universität Erlangen-Nürnberg 
National Hellenic Research Foundation 
Cyprus University of Technology 
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