Physically Cross-Linked Homopolymer Ion Gels for High Performance Electrolyte-Gated Transistors.
A new type of physically cross-linked solid polymer electrolyte was demonstrated by using a poly(vinylidene fluoride) (PVDF) homopolymer in a room-temperature ionic liquid. The physical origins of gelation, specific capacitance, ionic conductivity, mechanical property, and capacitive charge modulation in organic thin-film electrochemical transistors were investigated systematically. Gelation occurs through bridging phase-separated homopolymer crystals by polymer chains in the composite electrolyte, thereby forming a rubbery network. The resulting homopolymer ion gels are able to accommodate both outstanding electrical (ionically conductive and capacitive) and mechanical (flexible and free-standing) characteristics of the component ionic liquid and the structuring polymer, respectively. These ion gels were successfully applied to organic thin-film transistors as high-capacitance gate dielectrics. Therefore, these results provide an effective route to generate a highly conductive rubbery polymer electrolyte that can be used in widespread electronic and electrochemical devices.
Hae Min
HM
Yang
Yeong Kwan
YK
Kwon
Soo Byoung
SB
Lee
Sangwon
S
Kim
Surface Technology Division, Korea Institute of Materials Science , Changwon 51508, Republic of Korea.
Kihyon
K
Hong
Keun Hyung
http://orcid.org/0000-0003-4066-9991
KH
Lee
electrolyte-gated transistor; gate dielectric; homopolymer ion gel; physically cross-linked gel; solid electrolyte