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Jyun-Fong Jheng, Yu-Ying Lai, Jhong-Sian Wu, Yi-Hsiang Chao, Chien-Lung Wang and Chain-Shu Hsu Influences of the Non-Covalent Interaction Strength on Reaching High Solid-State Order and Device Performance of a Low Bandgap Polymer with Axisymmetrical Structural Units Advanced Materials 25

Article first published online: 1 MAR 2013 | DOI: 10.1002/adma.201300098

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A high organic field-effect transistor mobility (0.29 cm2V−1s−1) and bulk-heterojunction polymer solar cell performance (PCE of 6.82%) have been achieved in a low bandgap alternating copolymer consisting of axisymmetrical structural units, 5,6-difluorobenzo-2,1,3-thiadiazole. Introducing the fluorine substituents enhanced intermolecular interaction and improved the solid-state order, which consequently resulted in the highest device performances among the 2,1,3-thiadiazole-quarterthiophene based alternating copolymers.

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