Mapping Dopant Distribution in Semiconductor Nanowires Lincoln Lauhon, Northwestern University, DMR-0449933

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Mapping Dopant Distribution in Semiconductor
NanowiresLincoln Lauhon, Northwestern
University, DMR-0449933
Semiconductor nanowires are promising materials
for a range of nano-enabled applications in
sensing, opto/electronics, and energy storage and
conversion. Their properties are controlled by
tuning the diameter, composition, and doping. We
have developed a method to map the distribution
of dopants within individual semiconductor
nanowires, providing essential guidance to the
design of improved growth processes and device
models.
Atom Probe Tomography Reconstruction Top and side
views of the Ge (green dots) and P (brown
spheres) atom distributions in a
phosphorous-doped germanium NW. The P
concentration in the NW core is (10 ppm) is much
less than the gas phase (700 ppm) and shell (1500
ppm).
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Engaging K-12 Teachers in Teaching and Research
of NanomaterialsLincoln Lauhon, Northwestern
University, DMR-0449933
Leveraging the RET Program
Leveraging the NCLT Program
A nanoscience concept inventory was developed to
help 7-16 teachers align curricular goals with
the needs of a future nano literate workforce.
Development has continued and accelerated through
collaborations within the National Center for
Learning and Teaching (NCLT) at Northwestern
University. Nate Unterman, a high school teacher
co-developing the inventory, presented results of
an assessment instrument based on the inventory
at the American Chemical Society meeting in
Chicago. The effort now involves researchers at
least 5 partner institutions.
Prof. Lauhon directed the Research Experience for
Teachers (RET) program since 2004. Sherri Rukes,
a RET 2006 participant in Prof. Ken Shulls
group, was awarded a 10,000 grant from BP to
develop a laboratory project on fuel cells.
Greg Swackhammer, Prof. Lauhon, and Sherri Rukes
observe a super-absorbent polymer in action as
part of a nanomaterials activity demonstration.