期刊
ACS NANO
卷 4, 期 8, 页码 4388-4395出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn100966s
关键词
carbon nanotube; printed electronics; flexible electronics; thin-film transistor; ion gel; ambipolar; delay time
类别
资金
- National Science Foundation [DMR-0819885, NSF ECCS-00925312, DMR-0520513, EEC-0647560, DMR-0706067]
- University of Minnesota
- Nanoelectronics Research Initiative
- Natural Sciences and Engineering Research Council of Canada
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [0925312] Funding Source: National Science Foundation
Printing electronic components on plastic foils with functional liquid inks is an attractive approach for achieving flexible and low-cost circuitry for applications such as bendable displays and large-area sensors. The challenges for printed electronics, however, include characteristically slow switching frequencies and associated high supply voltages, which together impede widespread application. Combining printable high-capacitance dielectrics with printable high-mobility semiconductors could potentially solve these problems. Here we demonstrate fast, flexible digital circuits based on semiconducting carbon nanotube (CNT) networks and high-capacitance ion gel gate dielectrics, which were patterned by jet printing of liquid inks. Ion gel-gated CNT thin-film transistors (TFTs) with 50 mu m channel lengths display ambipolar transport with electron and hole mobilities >20 cm(2)/V . s; these devices form the basis of printed inverters, NAND gates, and ring oscillators on both polyimide and SiO2 substrates. Five-stage ring oscillators achieve frequencies >2 kHz at supply voltages of 2.5 V. corresponding to stage delay times of 50 mu s. This performance represents a substantial improvement for printed circuitry fabricated from functional liquid inks.
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