Concentration-Dependent Pyrene-Driven Self-Assembly in Benzo[1,2-b:4,5-b ']dithiophene (BDT)-Thienothiophene (TT)-Pyrene Copolymers
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SCOPUS
- Title
- Concentration-Dependent Pyrene-Driven Self-Assembly in Benzo[1,2-b:4,5-b ']dithiophene (BDT)-Thienothiophene (TT)-Pyrene Copolymers
- Authors
- Bathula, C; Kim, M; Song, CE; Shin, WS; Hwang, DH; Lee, JC; Kang, IN; Lee, SK; Park, T
- Date Issued
- 2015-06-09
- Publisher
- AMER CHEMICAL SOC
- Abstract
- We synthesized and characterized a series of pyrene units incorporated into benzo[1,2-b:4,5-b']dithiophene-based random copolymers. Concentration-dependent pyrene-driven self-assembly in the copolymers was systematically investigated using measurements of the copolymer optical and electrochemical properties, the hole mobilities extracted from the field-effect transistor and the space charge limited current, and the photovoltaic characteristics. We additionally studied the morphological changes using differential scanning calorimetry (DSC), synchrotron X-ray diffraction analysis, AFM, and TEM. The Py-Py interactions were found to facilitate the formation of fibrous structures. As the Py content increased, multiple Py-Py interactions within a few polymer chains dominated the interchain interactions to produce a more ordered phase but less interconnectivity among many polymer chains. A threshold quantity of the Py moieties enabled the Py-Py interactions to propagate over many polymer chains to form a highly interconnected structure that improved hole transport pathways and, thus, the photovoltaic performances of resulting bulk heterojunction polymer solar cells (5.03 -> 7.52%).
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/35272
- DOI
- 10.1021/ACS.MACROMOL.5B00760
- ISSN
- 0024-9297
- Article Type
- Article
- Citation
- MACROMOLECULES, vol. 48, no. 11, page. 3509 - 3515, 2015-06-09
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