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Biaxial strain in suspended graphene membranes for piezoresistive sensing
KTH, School of Information and Communication Technology (ICT), Integrated Devices and Circuits.ORCID iD: 0000-0003-4637-8001
KTH, School of Electrical Engineering (EES), Micro and Nanosystems.ORCID iD: 0000-0002-0525-8647
KTH, School of Information and Communication Technology (ICT), Integrated Devices and Circuits.ORCID iD: 0000-0003-1234-6060
KTH, School of Electrical Engineering (EES), Micro and Nanosystems.ORCID iD: 0000-0003-3452-6361
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2014 (English)In: 2014 IEEE 27th International Conference on Micro Electro Mechanical Systems (MEMS), IEEE , 2014, 1055-1058 p.Conference paper, Published paper (Refereed)
Abstract [en]

Pressure sensors based on suspended graphene membranes have shown extraordinary sensitivity for uniaxial strains, which originates from graphene's unique electrical and mechanical properties and thinness [1]. This work compares through both theory and experiment the effect of cavity shape and size on the sensitivity of piezoresistive pressure sensors based on suspended graphene membranes. Further, the paper analyzes the effect of both biaxial and uniaxial strain on the membranes. Previous studies examined uniaxial strain through the fabrication of long, rectangular cavities. The present work uses circular cavities of varying sizes in order to obtain data from biaxially strained graphene membranes.

Place, publisher, year, edition, pages
IEEE , 2014. 1055-1058 p.
Series
Proceedings of the IEEE International Conference on Micro Electro Mechanical Systems (MEMS), ISSN 1084-6999
Keyword [en]
Membranes, MEMS, Pressure sensors, Strain, Biaxial strains, Electrical and mechanical properties, Piezoresistive pressure sensors, Piezoresistive sensing, Rectangular cavity, Strained graphene, Suspended graphene, Uni-axial strains, Graphene
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-145475DOI: 10.1109/MEMSYS.2014.6765826ISI: 000352217500269Scopus ID: 2-s2.0-84898971449ISBN: 978-147993508-6 (print)OAI: oai:DiVA.org:kth-145475DiVA: diva2:718604
Conference
27th IEEE International Conference on Micro Electro Mechanical Systems, MEMS 2014; San Francisco, CA; United States; 26 January 2014 through 30 January 2014
Note

QC 20140521

Available from: 2014-05-21 Created: 2014-05-21 Last updated: 2016-06-10Bibliographically approved
In thesis
1. Graphene-based Devices for More than Moore Applications
Open this publication in new window or tab >>Graphene-based Devices for More than Moore Applications
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Moore's law has defined the semiconductor industry for the past 50 years. Devices continue to become smaller and increasingly integrated into the world around us. Beginning with personal computers, devices have become integrated into watches, phones, cars, clothing and tablets among other things. These devices have expanded in their functionality as well as their ability to communicate with each other through the internet. Further, devices have increasingly been required to have diverse of functionality. This combination of smaller devices coupled with diversification of device functionality has become known as more than Moore. In this thesis, more than Moore applications of graphene are explored in-depth.

Graphene was discovered experimentally in 2004 and since then has fueled tremendous research into its various potential applications. Graphene is a desirable candidate for many applications because of its impressive electronic and mechanical properties. It is stronger than steel, the thinnest known material, and has high electrical conductivity and mobility. In this thesis, the potentials of graphene are examined for pressure sensors, humidity sensors and transistors.

Through the course of this work, high sensitivity graphene pressure sensors are developed. These sensors are orders of magnitude more sensitive than competing technologies such as silicon nanowires and carbon nanotubes. Further, these devices are small and can be scaled aggressively.

Research into these pressure sensors is then expanded to an exploration of graphene's gas sensing properties -- culminating in a comprehensive investigation of graphene-based humidity sensors. These sensors have rapid response and recovery times over a wide humidity range. Further, these devices can be integrated into CMOS processes back end of the line.

In addition to CMOS Integration of these devices, a wafer scale fabrication process flow is established. Both humidity sensors and graphene-based transistors are successfully fabricated on wafer scale in a CMOS compatible process. This is an important step toward both industrialization of graphene as well as heterogeneous integration of graphene devices with diverse functionality. Furthermore, fabrication of graphene transistors on wafer scale provides a framework for the development of statistical analysis software tailored to graphene devices.

In summary, graphene-based pressure sensors, humidity sensors, and transistors are developed for potential more than Moore applications. Further, a wafer scale fabrication process flow is established which can incorporate graphene devices into CMOS compatible process flows back end of the line.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2016. xxvi, 79 p.
Series
TRITA-ICT, 2016:17
Keyword
Graphene, Humidity Sensor, Pressure Sensor, GFET, CMOS, BEOL, More than Moore, Integration, Statistics
National Category
Engineering and Technology Nano Technology
Identifiers
urn:nbn:se:kth:diva-188134 (URN)978-91-7729-024-7 (ISBN)
Public defence
2016-08-26, Sal C, Isafjordsgatan 22, Electrum 229, 164-40, Kista, 10:00 (English)
Opponent
Supervisors
Note

QC 20160610

Available from: 2016-06-10 Created: 2016-06-06 Last updated: 2016-06-10Bibliographically approved

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Niklaus, FrankVaziri, SamFischer, Andreas C.Forsberg, FredrikSchröder, Stephan

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