1. Development of Highly Crystalline Donor–Acceptor-Type Random Polymers for High Performance Large-Area Organic Solar Cells
- Author
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Hyungju Ahn, Jae Hoon Yun, Phillip Lee, Min Jae Ko, and Hae Jung Son
- Subjects
Materials science ,Polymers and Plastics ,Organic solar cell ,Triazole ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,law.invention ,Inorganic Chemistry ,Crystallinity ,chemistry.chemical_compound ,law ,Solar cell ,Polymer chemistry ,Materials Chemistry ,Copolymer ,chemistry.chemical_classification ,Organic Chemistry ,Energy conversion efficiency ,Polymer ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,Active layer ,chemistry ,Chemical engineering ,0210 nano-technology - Abstract
We developed donor–acceptor (D–A)-type random polymers based on 3,3′-difluoro-2,2′-bithiophene with various relative amounts of 5,6-difluoro-4,7-bis(5-bromo-(2-decyltetradecyl)thiophen-2-yl)-2,1,3-benzothiadiazole (2FBT) and 5,6-difluoro-4,7-bis(5-bromo-(2-octyldodecyl)thiophen-2-yl)-2-(3,4-dichlorobenzyloxybutyl)-2H-benzo[d][1,2,3]triazole (DCB-2FBTZ). Introducing small relative amounts of DCB-2FBTZ into the polymer was found to effectively enhance its solar cell performance, resulting in a power conversion efficiency of 9.02%, greater than the 7.29% that resulted from the PFBT-FTh copolymer. Moreover, when the active area of the BHJ film was increased to 1 cm2, the solar cell reproducibly showed a high performance, here with an efficiency of 8.01% even when the thickness of the active layer was 313 nm. Our studies revealed that including the DCB-2FBTZ group in the polymer simultaneously improved the solution processability and crystallinity of the polymer. These improvements resulted in the formation of...
- Published
- 2017
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