Details

Autor(en) / Beteiligte

• Ziabari, Amirkoushyar
• Torres, Pol
• Vermeersch, Bjorn
• Xuan, Yi
• Cartoixà, Xavier
• Torelló, Alvar
• Bahk, Je-Hyeong
• Koh, Yee Rui
• Parsa, Maryam
• Ye, Peide D
• Alvarez, F Xavier
• Shakouri, Ali

Titel

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

Ist Teil von

• Nature communications, 2018-01, Vol.9 (1), p.255-7, Article 255

Ort / Verlag

England: Nature Publishing Group

Erscheinungsjahr

2018

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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.