The Influence of the Solvent Evaporation Rate on the Phase Separation and Electrical Performances of Soluble Acene-Polymer Blend Semiconductors
- Authors
- Lee, WH; Kwak, D; Anthony, JE; Lee, HS; Choi, HH; Kim, DH; Lee, SG; Cho, K
- Issue Date
- Jan-2012
- Publisher
- WILEY-V C H VERLAG GMBH
- Citation
- ADVANCED FUNCTIONAL MATERIALS, v.22, pp.267 - 281
- Journal Title
- ADVANCED FUNCTIONAL MATERIALS
- Volume
- 22
- Start Page
- 267
- End Page
- 281
- URI
- http://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/12564
- DOI
- 10.1002/adfm.201101159
- ISSN
- 1616-301X
- Abstract
- The phase-separation characteristics of spin-cast difluorinated-triethylsilylethynyl anthradithiophene (F-TESADT)/poly(methyl methacrylate) (PMMA) blends are investigated with the aim of fabricating transistors with a high field-effect mobility and stability. It is found that the presence of PMMA in the F-TESADT/PMMA blends prevents dewetting of F-TESADT from the substrate and provides a platform for F-TESADT molecules to segregate and crystallize at the airfilm interface. By controlling the solvent evaporation rate of the spin-cast blend solution, it is possible to regulate the phase separation of the two components, which in turn determines the structural development of the F-TESADT crystals on PMMA. At a low solvent evaporation rate, a bilayer structure consisting of highly ordered F-TESAT crystals on the top and low-trap PMMA dielectric on the bottom can be fabricated by a one-step spin-casting process. The use of F-TESADT/PMMA blend films in bottom gate transistors produces much higher field-effect mobilities and greater stability than homo F-TESADT films because the phase-separated interface provides an efficient pathway for charge transport.
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Collections - College of Engineering > Department of Organic Materials and Fiber Engineering > 1. Journal Articles
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