화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Macromolecular Research, Vol.28, No.7, 670-676, June, 2020
DOI10.1007/s13233-020-8112-2  Export Citation
Polymeric Conformation of Organic Interlayers as a Determining Parameter for the Charge Transport of Organic Field-Effect Transistors
Jungyoon Seo, Seungtaek Oh, Giheon Choi, Hyun Ho Choi1, †, and Hwa Sung Lee†
  • Department of Materials Science and Chemical Engineering, Hanyang University, Ansan 15588, Korea
  • 1School of Materials Science and Engineering, Gyeongsang National University, Jinju 52828, Korea
E-mail:,
Here, we systematically investigated the effects of different carbon numbers or alkyl chain lengths of organic SAM interlayers on electrical properties of poly (dioctyl-quaterthiophenedioctyl-bithiazole) (PDQDB) organic field-effect transistors (OFETs). Although the end-group functionalities of organic interlayers were chemically identical, the phase state and structural ordering of polymeric chains in the organic SAM interlayers significantly affected the field-effect mobility (μFET) or threshold voltage (Vth). For cases where the PDQDB layer is interfaced with the highly ordered polymeric chains, the average μFETs demonstrated an increase from 0.11 to 0.17 cm2V-1s-1 when the chain length was changed from C8 to C18, respectively, with the Vth variations being negatively shifted. We confirmed that the conformation of polymeric chains in the organic SAM interlayers were not induced by the structural changes in the PDQDB film, which was verified by the crystalline and morphological analyses. Instead, the results could be explained in terms of the variations in the dipole arrangement with changes in the phase state or increased structural ordering of the polymeric alkyl chains in the SAM interlayers.
Keywords:organic interlayer;organic field-effect transistor;polymeric conformation;field-effect mobility;phase state
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