Title: Effects of basal-plane thermal conductivity and interface thermal conductance on the hot spot temperature in graphene electronic devices

Abstract

In this study, electrostatic force microscopy and scanning thermal microscopy are employed to investigate the electric transport and localized heating around defects introduced during transfer of graphene grown by chemical vapor deposition to an oxidized Si substrate. Numerical and analytical models are developed to explain the results based on the reported basal-plane thermal conductivity, κ, and interfacial thermal conductance, G, of graphene and to investigate their effects on the peak temperature. Irrespective of the κ values, increasing G beyond 4 × 10⁷ W m^–2 K^–1 can reduce the peak temperature effectively for graphene devices made on sub-10 nm thick gate dielectric, but not for the measured device made on 300-nm-thick oxide dielectric, which yields a cross-plane thermal conductance (G_ox) much smaller than the typical G of graphene. In contrast, for typical G values reported for graphene, increasing κ from 300 W m^–1 K^–1 toward 3000 W m^–1 K^–1 is effective in reducing the hot spot temperature for the 300-nm-thick oxide devices but not for the sub-10 nm gate dielectric case, because the heat spreading length (l) can be appreciably increased relative to the micron-scale localized heat generation spot size (r₀) only when the oxide layer is sufficiently thick. As such,more » enhancement of κ increases the vertical heat transfer area above the gate dielectric only for the thick oxide case. In all cases considered, the hot spot temperature is sensitive to varying G and κ only when the G/G_ox ratio and r₀/l ratio are below about 5, respectively.« less

Authors:

Choi, David  ^[1];

• Search DOE PAGES for author "Choi, David"
• Search DOE PAGES for ORCID "0000-0002-2666-4003"

Poudel, Nirakar ^[2]; Cronin, Stephen B. ^[2]; Shi, Li  ^[1]

• Search DOE PAGES for author "Shi, Li"
• Search DOE PAGES for ORCID "0000-0002-5401-6839"

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+ Show Author Affiliations

1. The Univ. of Texas at Austin, Austin, TX (United States)
2. Univ. of Southern California, Los Angeles, CA (United States)

Publication Date:

Mon Feb 13 00:00:00 EST 2017

Research Org.:

Univ. of Southern California, Los Angeles, CA (United States); Univ. of Texas, Austin, TX (United States)

Sponsoring Org.:

USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:

1465998

Alternate Identifier(s):

OSTI ID: 1361780

Grant/Contract Number:  

FG02-07ER46376; FG02-07ER46377

Resource Type:

Accepted Manuscript

Journal Name:

Applied Physics Letters

Additional Journal Information:

Journal Volume: 110; Journal Issue: 7; Journal ID: ISSN 0003-6951

Publisher:

American Institute of Physics (AIP)

Country of Publication:

United States

Language:

English

Subject:

36 MATERIALS SCIENCE