Adaptive Logic Circuits with Doping-Free Ambipolar Carbon Nanotube Transistors

Yu, Woo Jong; Kim, Un Jeong; Kang, Bo Ram; Lee, Il Ha; Lee, Eun-Hong; Lee, Young Hee

doi:10.1021/nl803066v

Cited by 112 publications

(123 citation statements)

References 26 publications

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“…As discussed above, the ambipolar TFTs cannot be completely turned OFF, which usually leads to an output voltage swing smaller than conventional complementary circuits. 46 Here we designed the widths of c and d (the "pull-down" transistors) to be 4 times larger than transistors a and b to balance the network strength. In this way, the output swing is maximized and the rising and falling times are equalized.…”

Section: ϫ10mentioning

confidence: 99%

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Printed, Sub-3V Digital Circuits on Plastic from Aqueous Carbon Nanotube Inks

et al. 2010

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Expanding applications for microelectronics in large-area sensor arrays, disposable sensor tapes, timeϪtemperature smart labels, radio frequency identification tags, and roll-up displays 1Ϫ4 motivate efforts to integrate electronics onto flexible plastic, paper, or metal substrates. A principal strategy for achieving flexible electronics is to employ graphic arts methods such as flexographic or ink-jet printing to pattern metallic, semiconducting, and insulating inks onto foils and paper. 5Ϫ10 Liquid phase printing offers the potential for high-throughput roll-toroll or sheet-to-sheet processing of electronics on large-area substrates, facilitating applications where large areas are necessary (e.g., displays) and also potentially translating into low production cost. Yet the challenge for printed electronics is to achieve high-performance circuits. The inherently low carrier mobilities of many printable organic or nanoparticle-based semiconductors lead to reduced transistor switching frequencies and high circuit supply voltages. Alternative strategies in which silicon chips are bonded to flexible substrates (by transfer printing or pick-andplace methods) are also attractive because they benefit from the superior electronic properties of silicon and the very advanced state of silicon microelectronics technology.11 In a competitive environment, the success of liquid phase printed electronics depends on substantial performance improvements, in particular, the development of faster, lower power printed circuits. Figure 1a displays a summary of reported signal delay times versus supply voltages for ring oscillator circuits based on organic semiconductors and carbon nanotube (CNT) arrays. It is evident that for nonprinted organic ring oscillators (open blue symbols) signal delays of 1Ϫ10 s have been achieved but only for supply voltages of 10Ϫ100 V, 12Ϫ24 while for supply voltages in the range of 4Ϫ10 V, the delay is above 10 s for the fastest circuits, with most displaying Ͼ1 ms switching times.25Ϫ28 Reports of printed ring oscillators are less common (solid green symbols in Figure 1a), and these circuits have generally required tens of volts to achieve switching times on the order of 1 ms.29Ϫ32 Such large voltages are not practical for many potential applications of flexible electronics where power will be supplied by thin-film batteries or radio frequency fields. Very recently, unipolar, p-type electrolyte-gated ring oscillator circuits have been demonstrated that indeed operate at very low

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Section: ϫ10mentioning

confidence: 99%

“…The mobilities are comparable to or better than that of CNT networks fabricated by other methods. 35,39Ϫ43,45Ϫ47 Ambipolar operation in turn allows fabrication of complementary-like logic circuits, 16,46,48,49 which is desirable from a circuit design perspective.…”

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confidence: 99%

Printed, Sub-3V Digital Circuits on Plastic from Aqueous Carbon Nanotube Inks

et al. 2010

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“…The gate electrode (Ti (5 nm)/Au (50 nm)) was formed similarly to the source and drain electrodes. The yield of transistors with on/off ratio of greater than 10 4 was 88% [5]. The detailed method has been described elsewhere [34,35].…”

Section: Methodsmentioning

confidence: 99%

“…[1,2] More interestingly, ambipolarity (in which the majority carrier is determined by the gate voltage) has been observed under vacuum and with a top gate oxide. [3][4][5] The unique ambipolarity of carbon nanotubes has been regarded as a drawback in their application to Si technology. To suppress the ambipolarity of the CNTs in CNT-based complementary metal oxide semiconductor (CMOS) technology, numerous chemical dopants such as amine-rich polymers, alkali metals, and nitronium ions, and various doping methods [6][7][8][9][10][11][12][13][14][15][16] have been suggested to control the majority carrier type of CNTs.…”

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confidence: 99%

Majority Carrier Type Conversion with Floating Gates in Carbon Nanotube Transistors

Kang

Lee

et al. 2009

Advanced Materials

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“…With a single CNT as active channel 35 ( Fig. 2b), FETs have shown large on/off ratios, but poor carrier mobility, which can be improved by employing aligned CNTs 36 or random CNTs network 37,38 ( Fig. 2c).…”

Section: D Nanomaterialsmentioning

confidence: 99%

Reconfigurable systems for multifunctional electronics

2017

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Reconfigurable systems complement the existing efforts of miniaturizing integrated circuits to provide a new direction for the development of future electronics. Such systems can integrate low dimensional materials and metamaterials to enable functional transformation from the deformation to changes in multiple physical properties, including mechanical, electric, optical, and thermal. Capable of overcoming the mismatch in geometries and forms between rigid electronics and soft tissues, bio-integrated electronics enabled by reconfigurable systems can provide continuous monitoring of physiological signals. The new opportunities also extend beyond to human-computer interfaces, diagnostic/therapeutic platforms, and soft robotics. In the development of these systems, biomimicry has been a long lasting inspiration for the novel yet simple designs and technological innovations. As interdisciplinary research becomes evident in such development, collaboration across scientists and physicians from diverse backgrounds would be highly encouraged to tackle grand challenges in this field.

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Adaptive Logic Circuits with Doping-Free Ambipolar Carbon Nanotube Transistors

Cited by 112 publications

References 26 publications

Printed, Sub-3V Digital Circuits on Plastic from Aqueous Carbon Nanotube Inks

Printed, Sub-3V Digital Circuits on Plastic from Aqueous Carbon Nanotube Inks

Majority Carrier Type Conversion with Floating Gates in Carbon Nanotube Transistors

Reconfigurable systems for multifunctional electronics

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