期刊
NANO LETTERS
卷 13, 期 3, 页码 954-960出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl3038773
关键词
Printed electronics; carbon nanotubes; ion gel; ring oscillator; delay time; ion conductivity
类别
资金
- National Science Foundation [DMR-1006391, ECCS-0925312]
- Office of Naval Research MURI Program [N00014-11-1-0690]
- Air Force Office of Scientific Research through STTR Program
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [0925312] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1006391] Funding Source: National Science Foundation
A central challenge for printed electronics is to achieve high operating frequencies (short transistor switching times) at low supply biases compatible with thin film batteries. In this report, we demonstrate partially printed five-stage ring oscillators with >20 kHz operating frequencies and stage delays <5 mu s at supply voltages below 3 V. The fastest ring oscillator achieved 1.2 mu s delay time at 2 V supply. The inverter stages in these ring oscillators were based on ambipolar thin film transistors (TFTs) employing semiconducting, single-walled carbon nanotube (CNT) networks and a high capacitance (similar to 1 mu F/cm(2)) ion gel electrolyte as the gate dielectric. All materials except the source and drain electrodes were aerosol jet printed. The TFTs exhibited high electron and hole mobilities (similar to 20 cm(2)/(V s)) and ON/OFF current ratios (up to 10(5)). Inverter switching times t were systematically characterized as a function of transistor channel length and ionic conductivity of the gel dielectric, demonstrating that both the semiconductor and the ion gel play a role in switching speed. Quantitative scaling analysis suggests that with suitable optimization low voltage, printed ion gel gated CNT inverters could operate at frequencies on the order of 1 MHz.
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