Enhancement of the Power Conversion Efficiency in Organic Photovoltaics by Unveiling the Appropriate Polymer Backbone Enlargement Approach |
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| Authors: | Christos L. Chochos Ranbir Singh Min Kim Nicola Gasparini Athanasios Katsouras Chandramouli Kulshreshtha Vasilis G. Gregoriou Panagiotis E. Keivanidis Tayebeh Ameri Christoph J. Brabec Kilwon Cho Apostolos Avgeropoulos |
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| Affiliation: | 1. Department of Materials Science Engineering, University of Ioannina, Ioannina, Greece;2. Advent Technologies SA, Patras Science Park, Platani‐Rio, Patra, Greece;3. Department of Chemical Engineering, Pohang University of Science and Technology, Pohang, South Korea;4. Institute of Materials for Electronics and Energy Technology (I‐MEET), Friedrich‐Alexander‐University Erlangen‐Nuremberg, Erlangen, Germany;5. National Hellenic Research Foundation (NHRF), Athens, Greece;6. Department of Mechanical Engineering and Materials Science and Engineering, Cyprus University of Technology, Limassol, Cyprus;7. Bavarian Center for Applied Energy Research (ZAE Bayern), Erlangen, Germany |
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| 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. |
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| Keywords: | morphology organic electronics polymer semiconductors recombination dynamics supramolecular assembly |
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