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Investigation of Electro-thermal and Thermoelectric Properties of Carbon Nanomaterials

Electronic Theses of Indian Institute of Science

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Field Value
 
Title Investigation of Electro-thermal and Thermoelectric Properties of Carbon Nanomaterials
 
Creator Verma, Rekha
 
Subject Carbon Nanomaterials
Carbon Nanotubes
Graphene
Carbon Nanomaterials - Thermoelectric Properties
Carbon Nanomaterials - ElectroThermal Properties
Carbon Nanomaterials - Synthesis
Carbon Nanomaterials - Electromigration
Single Layer Graphene
Carbon Materials - Thermal Management
Metallic Single Walled Carbon Nanotubes
Metallic SWCNT
Single Layer Graphene (SLG)
Nanotechnology
 
Description Due to the aggressive downscaling of the CMOS technology, power and current densities are increasing inside the chip. The limiting current conduction capacity(106 Acm−2)and thermal conductivity(201Wm−1K−1 for Al and 400 Wm−1K−1 for Cu) of the existing interconnects materials has given rise to different electro-thermal issues such a shot-spot formation, electromigration, etc. Exploration of new materials with high thermal conductivity and current conduction has thus attracted much attention for future integrated circuit technology. Among all the elemental materials, carbon nanomaterials (graphene and carbon nanotube) possess exceptionally high thermal (600-7000 Wm−1K−1) and current( ~108 -109 Acm−2)conduction properties at room temperature, which makes them potential candidate for interconnect materials. At the same time development of efficient energy harvesting techniques are also becoming important for future wireless autonomous devices. The excess heat generated at the hot-spot location could be used to drive an electronic circuit through a suitable thermoelectric generator. As the See beck coefficient of graphene is reported to be the highest among all elementary semiconductors, exploration of thermoelectric properties of graphene is very important. This thesis investigates the electrothermal and thermoelectric properties of metallic single walled carbon nanotube (SWCNT) and single layer graphene (SLG) for their possible applications in thermal management in next generation integrated circuits.
A closed form analytical solution of Joule-heating equation in metallic SWCNTs is thus proposed by considering a temperature dependent lattice thermal conductivity (κ) on the basis of three-phonon Umklapp, mass-difference and boundary scattering phenomena. The solution of which gives the temperature profile over the SWCNT length and hence the location of hot-spot(created due to the self-heating inside the chip) can be predicted. This self-heating phenomenon is further extended to estimate the electromigration performance and mean-time-to-failure of metallic SWCNTs. It is shown that metallic SWCNTs are less prone to electromigration. To analyze the electro-thermal effects in a suspended SLG, a physics-based flexural phonon dominated thermal conductivity model is developed, which shows that κ follows a T1.5 and T−2 law at lower(
 
Contributor Mahapatra, Santanu
 
Date 2018-04-06T08:12:56Z
2018-04-06T08:12:56Z
2018-04-06
2013
 
Type Thesis
 
Identifier http://etd.iisc.ernet.in/2005/3360
http://etd.iisc.ernet.in/abstracts/4228/G25761-Abs.pdf
 
Language en_US
 
Relation G25761