Ohmic-Contact-Gated Carbon Nanotube Transistors for High-Performance Analog Amplifiers

William A. Gaviria Rojas; Megan E. Beck; Vinod K. Sangwan; Silu Guo; Mark C. Hersam

doi:10.1002/adma.202100994

Ohmic-Contact-Gated Carbon Nanotube Transistors for High-Performance Analog Amplifiers

William A. Gaviria Rojas, Megan E. Beck, Vinod K. Sangwan, Silu Guo, Mark C. Hersam^*

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

9 Scopus citations

Abstract

The growing demand for ubiquitous data collection has driven the development of sensing technologies with local data processing. As a result, solution-processed semiconductors are widely employed due to their compatibility with low-cost additive manufacturing on a wide range of substrates. However, to fully realize their potential in sensing applications, high-performance scalable analog amplifiers must be realized. Here, ohmic-contact-gated transistors (OCGTs) based on solution-processed semiconducting single-walled carbon nanotubes are introduced to address this unmet need. This new device concept enables output current saturation in the short-channel limit without compromising output current drive. The resulting OCGTs are used in common-source amplifiers to achieve the highest width-normalized output current (≈30 µA µm^–1) and length-scaled signal gain (≈230 µm^–1) to date for solution-processed semiconductors. The utility of these amplifiers for emerging sensing technologies is demonstrated by the amplification of complex millivolt-scale analog biological signals including the outputs of electromyography, photoplethysmogram, and accelerometer sensors. Since the OCGT design is compatible with other solution-processed semiconducting materials, this work establishes a general route to high-performance, solution-processed analog electronics.

Original language	English (US)
Article number	2100994
Journal	Advanced Materials
Volume	33
Issue number	34
DOIs	https://doi.org/10.1002/adma.202100994
State	Published - Aug 26 2021

Funding

This research was supported by the National Science Foundation Materials Research Science and Engineering Center (NSF DMR‐1720139) of Northwestern University. W.A.G.R. and M.E.B. acknowledge support from the National Science Foundation Graduate Research Fellowship Program. This work made use of the Northwestern University NUANCE Center and the Northwestern University Micro/Nano Fabrication Facility (NUFAB), which are supported by the Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF EECS‐1542205), the Materials Research Science and Engineering Center (NSF DMR‐1720139), the State of Illinois, and Northwestern University.

Keywords

biological sensors
field-effect transistors
self-alignment
short channels
solution processing

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
General Materials Science

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10.1002/adma.202100994

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abstract = "The growing demand for ubiquitous data collection has driven the development of sensing technologies with local data processing. As a result, solution-processed semiconductors are widely employed due to their compatibility with low-cost additive manufacturing on a wide range of substrates. However, to fully realize their potential in sensing applications, high-performance scalable analog amplifiers must be realized. Here, ohmic-contact-gated transistors (OCGTs) based on solution-processed semiconducting single-walled carbon nanotubes are introduced to address this unmet need. This new device concept enables output current saturation in the short-channel limit without compromising output current drive. The resulting OCGTs are used in common-source amplifiers to achieve the highest width-normalized output current (≈30 µA µm–1) and length-scaled signal gain (≈230 µm–1) to date for solution-processed semiconductors. The utility of these amplifiers for emerging sensing technologies is demonstrated by the amplification of complex millivolt-scale analog biological signals including the outputs of electromyography, photoplethysmogram, and accelerometer sensors. Since the OCGT design is compatible with other solution-processed semiconducting materials, this work establishes a general route to high-performance, solution-processed analog electronics.",

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Ohmic-Contact-Gated Carbon Nanotube Transistors for High-Performance Analog Amplifiers

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Keywords

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