期刊
ORGANIC ELECTRONICS
卷 28, 期 -, 页码 82-87出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2015.10.016
关键词
Raman; Ionic liquid; Organic transistor; poly(3-hexylthiophene); Polaron; Bipolaron
资金
- Grants for Excellent Graduate Schools (Practical Chemical Wisdom), MEXT, Japan
Using Raman spectroscopy, we observed carriers, polarons and bipolarons formed in an ionic-liquid-gated P3HT electrochemical transistor with an ionic liquid [BMIM][TFSI] as a gate dielectric. The relationships between the source-drain current (I-D), the gate voltage (V-G) at a constant source-drain voltage (V-D), and injected charges at each V-G were investigated. An increase in I-D is attributed to the formation of positive polarons, whereas a decrease in I-D corresponded to positive bipolarons. Thus, positive polarons are efficient carriers in P3HT electrochemical transistors. Charge densities, doping levels, electrical conductivities, and mobilities of tiolarons in P3HT were calculated from the electrochemical measurements. Only positive polarons exist below the dopant level x = 27 mol%, whereas at higher doping levels, polarons and bipolarons coexist. The mobility of polarons was dependent on the doping level. The highest mobility was 031 cm(2) V-1 s(-1) at x = 15 mol%. (C) 2015 Elsevier B.V. All rights reserved.
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