Date

Place

Room A (Room 325)
15. Organic Transistor Physics
August 19, 2015 (Wednesday)
16:00 ~ 17:30

[15-4]
17:15 ~ 17:30
Title:Understanding 3-Dimensional Conduction Channel in Polymer Transistors from Temperature-Dependent Structure/Transport Studies
Sangsik Park, Han Wool Park, Do Hyung Park, Kwang Seok Ahn (Soongsil Univ., Korea), Hyun Ho Choi (POSTECH, Korea), Jianguo Mei (Purdue Univ., U.S.A.), Kilwon Cho(POSTECH, Korea), Zhenan Bao (Stanford Univ., U.S.A.), Dong Ryeol Lee, Moon Sung Kang, and Do Hwan Kim (Soongsil Univ., Korea)
Abstract: We have demonstrated 3-dimensional conduction channel of semiconducting polymer thin-films via the comparative study of temperature-dependent structure/transport. Specifically, the representative two isoindigo-based conjugated polymers (PII2T-Ref with branched alkyl chains and PII2T-Si with siloxane groups) were used in this study, exhibiting two different types of molecular orientations such as unimodal- and bimodal fashions, respectively. The transition of the relevant crystallographic parameters including the ��-stacking distance and the coherence length of the lateral crystallites was observed in both the polymers at different temperature regimes, thereby strongly affecting the charge transport including the EA values and the ��0 value. In particular, this comprehensive understanding on the temperature-dependent electrical transport for PII2T-Si with bimodal molecular orientation imparts the concept of 3-dimensional charge conduction to apply to the other transport mechanism in semiconducting polymers. We believe that our findings will enable polymer semiconductors to be more effectively utilized not only in high-performance flexible transistors but also in the wide range of photovoltaic and biomedical applications.
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