Molecular-weight engineering of high-performing diketopyrrolopyrrole-based copolymer bearing high pi-extended long donating units
- Authors
- Hoang, Mai Ha; Nguyen, Duc Nghia; Ngo, Trinh Tung; Um, Hyun Ah; Cho, Min Ju; Choi, Dong Hoon
- Issue Date
- 28-1월-2016
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Diketopyrrolopyrrole; Thin film transistor; Photovoltaic cell
- Citation
- POLYMER, v.83, pp.77 - 84
- Indexed
- SCIE
SCOPUS
- Journal Title
- POLYMER
- Volume
- 83
- Start Page
- 77
- End Page
- 84
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/89762
- DOI
- 10.1016/j.polymer.2015.12.016
- ISSN
- 0032-3861
- Abstract
- Two D-A alternating pi-conjugated copolymers bearing diketopyrrolopyrrole (DPP) and sextetthiophene with different molecular weights were synthesized to investigate their physical properties and performance in thin-film transistors and photovoltaic cells. The solubility and molecular weight (MW) of these copolymers with a highly rigid backbone were improved by controlling the feeding ratio of the monomer in the polymerization mixture. These polymers exhibited high crystallinity with a predominant edge-on chain orientation on the substrate. The higher-MW P(DPP-6T)-2 copolymer displayed a higher hole mobility of 3.26 cm(2) V-1 s(-1) than the low-MW P(DPP-6T)-1 copolymer. Bulk heterojunction photovoltaic cells made of a blend of P(DPP-6T)-2 and (6,6) ephenyl C-71-butyric acid methyl ester displayed good device performance with a power conversion efficiency of 4.68%. (C) 2015 Elsevier Ltd. All rights reserved.
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