Bis(thienothiophenyl) Diketopyrrolopyrrole-Based Conjugated Polymers with Various Branched Alkyl Side Chains and Their Applications in Thin-Film Transistors and Polymer Solar Cells
- Authors
- Shin, Jicheol; Park, Gi Eun; Lee, Dae Hee; Um, Hyun Ah; Lee, Tae Wan; Cho, Min Ju; Choi, Dong Hoon
- Issue Date
- 11-2월-2015
- Publisher
- AMER CHEMICAL SOC
- Keywords
- polymer semiconductor; diketopyrrolopyrrole; branched alkyl side chain; thin-film transistor; polymer solar cell
- Citation
- ACS APPLIED MATERIALS & INTERFACES, v.7, no.5, pp.3280 - 3288
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACS APPLIED MATERIALS & INTERFACES
- Volume
- 7
- Number
- 5
- Start Page
- 3280
- End Page
- 3288
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/94402
- DOI
- 10.1021/am508026s
- ISSN
- 1944-8244
- Abstract
- New thienothiophene-flanked diketopyrrolopyrrole and thiophene-containing p-extended conjugated polymers with various branched alkyl side-chains were successfully synthesized. 2-Octyldodecyl, 2-decyltetradecyl, 2-tetradecylhexadecyl, 2-hexadecyloctadecyl, and 2-octadecyldocosyl groups were selected as the side-chain moieties and were anchored to the N-positions of the thienothiophene-flanked diketopyrrolopyrrole unit. All five polymers were found to be soluble owing to the bulkiness of the side chains. The thin-film transistor based on the 2-tetradecylhexadecyl-substituted polymer showed the highest hole mobility of 1.92 cm(2) V-1 s(-1) due to it having the smallest pi-pi stacking distance between the polymer chains, which was determined by grazing incidence X-ray diffraction. Bulk heterojunction polymer solar cells incorporating [6,6]-phenyl-C71-butyric acid methyl ester as the n-type molecule and the additive 1,8-diiodooctane (1 vol %) were also constructed from the synthesized polymers without thermal annealing; the device containing the 2-octyldodecyl-substituted polymer exhibited the highest power conversion efficiency of 5.8%. Although all the polymers showed similar physical properties, their device performance was clearly influenced by the sizes of the branched alkyl side-chain groups.
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