The lamination of a high-capacitance ion gel dielectric layer onto semiconducting carbon nanotube (CNT) thin-film transistors (TFTs) that are bottom-gated with a low-capacitance polymer dielectric layer drastically reduces the operating voltage of the devices resulting from the capacitive coupling effect between the two dielectric layers sandwiching the CNT channel. As the CNT channel has a network structure, only a compact area of ion gel is required to make the capacitive coupling effect viable, unlike the planar channels of previously reported transistors that required a substantially larger area of ion gel dielectric layer to induce the coupling effect. The capacitively coupled CNT TFTs possess superlative electrical characteristics such as high carrier mobilities (42.0 cm2 (Vs)−1 for holes and 59.1 cm2 (Vs)−1 for electrons), steep subthreshold swings (160 mV dec−1 for holes and 100 mV dec−1 for electrons), and low gate leakage currents (<1 nA). These devices can be further integrated to form complex logic circuits on flexible substrates with high mechanical resilience. The layered geometry of the device coupled with scalable solution-based fabrication has significant potential for large-scale flexible electronics.
Bibliographical noteFunding Information:
Y.C. and J.K. contributed equally to this work. J.H.C. acknowledges financial support from the Basic Science Research Program through a National Research Foundation of Korea grant funded by the Korean Government (2017R1A2B2005790). J.A.L. acknowledges the financial support from the Future Resource Research Program of the Korea Institute of Science and Technology (2E28200). J.K. and M.C.H. were supported by the National Science Foundation (DMR-1505849). This work made use of the Northwestern University Atomic and Nanoscale Characterization Experimental Center, which has received support from the NSF MRSEC (DMR-1720139), State of Illinois, and Northwestern University. In addition, the Raman instrumentation was funded by the Argonne-Northwestern Solar Energy Research Energy Frontier Research Center (DOE DE-SC0001059).
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All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics