Thickness-dependent electrical properties of soluble acene–polymer blend semiconductors
- Authors
- Lee, Seung Goo; Lee, Hwa Sung; Lee, Shichoon; Kim, Chang Wan; Lee, Wi Hyoung
- Issue Date
- May-2015
- Publisher
- Elsevier BV
- Keywords
- diF-TES-ADT; Organic semiconductor; Organic transistor; Polymer blend; Soluble acene
- Citation
- Organic Electronics, v.24, pp.113 - 119
- Indexed
- SCIE
SCOPUS
- Journal Title
- Organic Electronics
- Volume
- 24
- Start Page
- 113
- End Page
- 119
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/18292
- DOI
- https://doi.org/10.1016/j.orgel.2015.05.030
- ISSN
- 1566-1199
- Abstract
- This study examined the electrical properties of 2,8-difluoro-5,11-bis(triethylsilylethynyl)anthradithiophene (diF-TES-ADT)/poly(methyl methacrylate) (PMMA) blend semiconductors for fabricating high-performance organic field-effect transistors (OFETs). The phase-separation characteristics were investigated over a range of blend solution concentrations. Regardless of the concentration, diF-TES-ADT crystal-top/PMMA-bottom bilayer structures were formed onto SiO2/Si substrates owing to the surface energy difference between diF-TES-ADT and PMMA. The phase-separated interfaces between diF-TES-ADT and PMMA provided efficient pathways for charge transport. Consequently, a high field-effect mobility of 0.1 cm2/V s and a current on/off ratio of 107 were achieved at the optimum concentration of 20 mg/ml where thickness of phase-separated diF-TES-ADT crystal is 20 nm. When the concentration was too low (e.g., 10 mg/ml) or too high (e.g., 30, 40, and 50 mg/ml), field-effect mobility was reduced significantly. It can be concluded that this is due to the homogeneity and thickness of the phase-separated diF-TES-ADT crystals. © 2015 Elsevier B.V. All rights reserved.
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