Oral Exam Announcement - Alex Neuhausen

Alex Neuhausen alexneu at stanford.edu
Tue Sep 20 18:19:07 PDT 2011

Stanford University PhD Oral Defense - Department of Electrical Engineering
Date: September 26, 2011 (Monday)
Time: 1:00 PM (Refreshments at 12:45 PM)
Location: McCullough 335
Title:* Molecular Junctions of Self-Assembled Monolayers with Universal Soft
Contacts *


As transistor scaling following Moore’s Law faces mounting obstacles
from device
leakage and heat dissipation, numerous disruptive “post-silicon”
technologies are being explored. Devices consisting of a single or few
organic molecules have been proposed as extremely scalable, low-power logic
and memory elements. The diversity and consistency of molecules that may be
obtained through chemical synthesis has resulted in numerous exciting device
proposals. However, in the many studies of transport through molecular
systems that have been presented in the literature, the difficulty in
establishing contacts to a desired molecular system has arisen as a
complication. There is an emerging consensus that the ideal molecular device
geometry should consist of a self-assembled monolayer (SAM) sandwiched
between two electrodes to average out molecule-contact variations and ensure
consistent behavior with scaling.****

** **

This talk will begin with a discussion of the general characteristics of a
scalable molecular device, and then briefly review recent device designs
demonstrated in the literature, with an emphasis on the limitations of the
various contact materials and deposition methods. A novel, scalable,
high-yield molecular junction incorporating an isolating dielectric layer
and a soft polymer top contact will then be presented. Studies of transport
through alkanethiol SAMs with a variety of terminations formed on gold
substrates will be presented. Models explaining the molecular length-decay
and unique temperature dependence behavior will be demonstrated.  Studies of
devices incorporating platinum and silver substrates will be presented to
provide insight into the packing behavior of the SAM. The limitations of
devices with soft contacts will be explored with the presentation of studies
of conjugated molecular systems and molecules with redox-active
organometallic terminal groups. The demonstration of scalable, high-yield
molecular junctions is an important step in the development of computing
devices beyond Moore’s Law.
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