A Roundabout Approach to Control Morphological Orientation and Solar-Cell Performance by Modulating Side-Chain Branching Position in Benzodithiophene-Based Polymers
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- A Roundabout Approach to Control Morphological Orientation and Solar-Cell Performance by Modulating Side-Chain Branching Position in Benzodithiophene-Based Polymers
- Lee, Kyu Cheol; Song, Seyeong; Lee, Junghoon; Kim, Dong Suk; Kim, Jin Young; Yang, Changduk
- Issue Date
- WILEY-V C H VERLAG GMBH
- CHEMPHYSCHEM, v.16, no.6, pp.1305 - 1314
- To be meaningful to guide the rational design of novel high-performance conjugated semiconductors, we prepared three benzo[1,2-b:4,5-b]dithiophene (BDT)-based polymers by systematically moving the branching point of the alkyl chain. The effect of side-chain engineering was thoroughly investigated by a range of techniques. We demonstrate that a subtle change in the branching position in the BDT core can have a critical impact on polymer packing and preferential backbone orientation in thin films; copolymers made from BDT and thieno[3,4-c]pyrrole-4,6-dione units (TPD) adopt more of a face-on orientation as the branching point is shifted closer to the backbone, which can be correlated with a dramatic difference in solar-cells performance. The high short-circuit current density (11.6 mAcm(-2)) for the copolymer with one carbon atom between the alkoxylated oxygen atom and the branching point results from its predominantly face-on orientation and smoother surface in thin films, which results in power conversion efficiencies as high as 4.56%.
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