Full-field thermal imaging of quasiballistic crosstalk reduction in nanoscale devices.

Abstract:

:Understanding nanoscale thermal transport is of substantial importance for designing contemporary semiconductor technologies. Heat removal from small sources is well established to be severely impeded compared to diffusive predictions due to the ballistic nature of the dominant heat carriers. Experimental observations are commonly interpreted through a reduction of effective thermal conductivity, even though most measurements only probe a single aggregate thermal metric. Here, we employ thermoreflectance thermal imaging to directly visualise the 2D temperature field produced by localised heat sources on InGaAs with characteristic widths down to 100 nm. Besides displaying effective thermal performance reductions up to 50% at the active junctions in agreement with prior studies, our steady-state thermal images reveal that, remarkably, 1-3 μm adjacent to submicron devices the crosstalk is actually reduced by up to fourfold. Submicrosecond transient imaging additionally shows responses to be faster than conventionally predicted. A possible explanation based on hydrodynamic heat transport, and some open questions, are discussed.

journal_name

Nat Commun

journal_title

Nature communications

authors

Ziabari A,Torres P,Vermeersch B,Xuan Y,Cartoixà X,Torelló A,Bahk JH,Koh YR,Parsa M,Ye PD,Alvarez FX,Shakouri A

doi

10.1038/s41467-017-02652-4

subject

Has Abstract

pub_date

2018-01-17 00:00:00

pages

255

issue

1

issn

2041-1723

pii

10.1038/s41467-017-02652-4

journal_volume

9

pub_type

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