Molecular aggregation–performance relationship in the design of novel cyclohexylethynyl end-capped quaterthiophenes for solution-processed organic transistors
SCIE
SCOPUS
- Title
- Molecular aggregation–performance relationship in the design of novel cyclohexylethynyl end-capped quaterthiophenes for solution-processed organic transistors
- Authors
- Tae Kyu An; Seung-Hoon Hahn; Sooji Nam; Hyojung Cha; Yecheol Rho; Dae Sung Chung; Ree, M; Moon Seong Kang; Soon-Ki Kwon; Yun-Hi Kim; Park, CE
- Date Issued
- 2013-03
- Publisher
- ELSEVIER
- Abstract
- The synthesis and characterization of cyclohexylethenyl end-capped quaterthiophenes is reported. Additionally, an investigation of the performance of organic field-effect transistors based on these quaterthiophenes in view of the relationship between the solid-state (or aggregate) order and the electronic performance is described. UV-vis absorption measurements revealed that the quaterthiophene with an asymmetrically substituted cyclohexylethynyl end-group induced the formation of H-type aggregates, whereas the quaterthiophene with a symmetrically substituted cyclohexylethynyl end-groups favored the formation of J-type aggregates. Two-dimensional grazing-incidence wide-angle X-ray scattering studies were performed to support the molecular structure-dependent packing of films of the new quaterthiophenes. Solution-processed quaterthiophenes were tested as the active layers of p-type organic field-effect transistors with a bottom gate/top contact geometry. The field-effect mobility of devices that incorporated asymmetric quaterthiophene molecules was quite high, exceeding 0.02 cm(2)/V s, due to H-aggregation and good in-plane ordering. In contrast, the field-effect mobility of devices that incorporated symmetrical quaterthiophenes, was low, above 5 x 10(-4) cm(2)/(V s), due to the formation of J-aggregates and poor in-plane ordering. A comparison of the symmetrical and asymmetrical quaterthiophene derivatives revealed that the molecular aggregation-dependent packing, determined by the cyclohexylethynyl end groups, was responsible for influencing the organic field-effect transistor performance. (C) 2012 Elsevier Ltd. All rights reserved.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/27484
- DOI
- 10.1016/J.DYEPIG.2012.11.018
- ISSN
- 0143-7208
- Article Type
- Article
- Citation
- DYES AND PIGMENTS, vol. 96, no. 3, page. 756 - 762, 2013-03
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