Electrical characteristics of ion gels prepared by loading different amounts of 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([EMIM][TFSI]) in Poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) are investigated and compared with those of ion liquid, [EMIM][TFSI] for possible application as a gate stack for flexible electronic devices. Capacitance and impedance as a function of frequency are measured, which can be well accounted for by a simple circuit model identifying the local device components. The operation of a flexible field effect transistor based on graphene and the ion gel as a top gate stack is also demonstrated.
This work was supported by “ Human Resources Program in Energy Technology ” of the Korea Institute of Energy Technology Evaluation and Planning ( KETEP ), granted financial resource from the Ministry of Trade, Industry and Energy (No. 20164030201380 ), Basic Science Research Program ( NRF-2015R1D1A1A01057417 ) through the National Research Foundation of Korea ( NRF ) funded by the Ministry of Education of the Republic of Korea , and by the Ajou University research fund.
