Improved performance of non-fullerene polymer solar cells using wide-bandgap random terpolymers
| Autor: | Zhaomiyi Zeng, Zhenqiang Huang, Zhicheng Hu, Fei Huang, Lei Ying, Yong Cao, Kang Li, Wenkai Zhong |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
chemistry.chemical_classification
Materials science Photovoltaic system Energy conversion efficiency 02 engineering and technology General Chemistry Polymer Conjugated system 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Polymer solar cell 0104 chemical sciences Electronic Optical and Magnetic Materials Biomaterials Chemical engineering chemistry Materials Chemistry Side chain Charge carrier Electrical and Electronic Engineering 0210 nano-technology HOMO/LUMO |
| Zdroj: | Organic Electronics. 57:317-322 |
| ISSN: | 1566-1199 |
| DOI: | 10.1016/j.orgel.2018.03.005 |
| Popis: | A series of wide-bandgap random terpolymers were designed and synthesized for application as the donor polymers in non-fullerene polymer solar cells. The benzodithiophene (BDT) derivatives with phenyl and thienyl conjugated side chains (denoted as BDTP and BDTT, respectively) were paired with an electron-withdrawing moiety (TzBI-O) to construct a series of wide-bandgap random terpolymers. The highest occupied molecular orbital energy levels of the resulting polymers gradually decreased from −5.26 to −5.33 eV upon increasing the BDTP content from 0 to 100%, leading to improved open-circuit voltages from 0.85 to 0.90 V for the resulting photovoltaic devices. In particular, photovoltaic devices based on terpolymers containing 50% BDTP exhibited the highest performance with a power conversion efficiency of 8.55%. This improvement was attributed to the suppressed bimolecular recombination and more balanced charge carrier mobilities in the terpolymer-based devices. These results demonstrate that the use of terpolymers represents a feasible strategy for the construction of highly efficient donors for non-fullerene polymer solar cells. |
| Databáze: | OpenAIRE |
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