Wetting transition for carbon nanotube arrays under metal contacts

Physical Review Letters
V Perebeinos, J Tersoff

Abstract

Structural arrays with nanoscale spacing arise in many device concepts. Carbon nanotube transistors are an extreme example, where a practical technology will require arrays of parallel nanotubes with spacing of order 10 nm or less. We show that with decreasing pitch there is a first-order transition, from a robust structure in which the metal wets the substrate between tubes, to a poorly wetting structure in which the metal rides atop the nanotube array without touching the substrate. The latter is analogous to the superhydrophobic "lotus leaf effect." There is a sharp minimum in the delamination energy of metal contacts at the transition pitch. We discuss implications for contact resistance and possible mitigation strategies.

References

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Jan 31, 2014·Physical Review Letters·V PerebeinosW Haensch
Jul 12, 2014·Nano Letters·V Perebeinos, J Tersoff

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Citations

Dec 9, 2017·Physical Review Letters·Roohollah HafiziVasili Perebeinos
Sep 13, 2016·Science Advances·Gerald J BradyMichael S Arnold
Nov 26, 2015·Nanotechnology·Wei LiuMiroslav Haluska
Aug 2, 2017·ACS Applied Materials & Interfaces·Yongho JooPadma Gopalan

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