High Performance Semiconducting Polymers Containing Bis(bithiophenyl dithienothiophene)-Based Repeating Groups for Organic Thin film Transistors
- Authors
- Kim, Kyung Hwan; Chung, Dae Sung; Park, Chan Eon; Choi, Dong Hoon
- Issue Date
- 1-1월-2011
- Publisher
- WILEY
- Keywords
- annealing; charge transport; conjugated polymer; dithienothiophene; mobility; organic thin film transistor; semiconductor; synthesis; thin films
- Citation
- JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY, v.49, no.1, pp.55 - 64
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
- Volume
- 49
- Number
- 1
- Start Page
- 55
- End Page
- 64
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/113299
- DOI
- 10.1002/pola.24415
- ISSN
- 0887-624X
- Abstract
- New dithienothiophene-containing conjugated polymers, such as poly(2,6-bis(2-thiopheny1-3-dodecylthiophene-2-yl)dithieno[3,2-b;2',3'-d]thiophene, 4 and poly(2,6-bis (2-thiophenyl-4-dodecylthiophene-2-yl)dithieno[3,2-b;2',3'-d]thiophene, 8 have been successfully synthesized via Stille coupling reactions using dodecyl-substituted thiophene-based monomers, bistributyltin dithienothiophene, and bistributyltin bithiophene; these polymers have been fully characterized. The main difference between the two polymers is the substitution position of the dodecyl side chains in the repeating group. Grazing-incidence X-ray diffraction (GI-XRD) gave clear evidence of edge-on orientation of polycrystallites to the substrate. The semiconducting properties of the two polymers have been evaluated in organic thin film transistors (OTFTs). The two conjugated polymers 4 and 8 exhibit fairly high hole carrier mobilities as high as mu(ave) = 0.05 cm(2)Ns (I-ON/OFF = 3.42 x 10(4)) and mu(ave) = 0.01 cm(2)/Vs, (I-ON/OFF = 1.3 x 10(5)), respectively, after thermal annealing process. The solvent annealed films underwent reorganization of the molecules to induce higher crystallinity. Well-defined atomic force microscopy (AFM) topography supported a significant improvement in TFT device performance. The hole carrier mobilities of the solvent annealed films are comparable to those obtained for a thermally annealed sample, and were one-order higher than those obtained with a pristine sample. (C) 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 49: 55-64, 2011
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