Faculty
Coordinator
Dr. Patrick Lenahan
Professor of Engineering Science and Mechanics
Mail to:
212 Earth-Engineering Sciences Bldg.
University Park, PA 16802
Email:
pmlesm@engr.psu.edu
Phone:
(814)-863-4630
Fax: (814)-865-9974
Frequently Asked
Questions
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Capabilities/Equipment
Lab Capabilities Statement:
Equipment
P.M. Lenahan
The Pennsylvania State University
Six Magnetic Resonance
Spectrometers
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Two
(essentially “state of the art”) commercial ESR spectrometers
manufactured by Bruker. The systems operate at X-band (~9 to 10
GHz). One of the systems is equipped with an electron nuclear
double resonance (ENDOR) system which, for certain defects, allows
determination of extremely detailed defect structure.
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Four spin
dependent recombination (SDR) spectrometers. These systems
are home made. Three systems operate at X-band. A
fourth system operates at Q Band. To the best of our
knowledge, the SDR systems are the most sensitive in use
anywhere. With care, these systems have a sensitivity of order 103
spins per Gauss of line width. In round numbers, that is about
1000 total defects per sample. (We think it will be possible to
improve upon that sensitivity by as much as three orders of
magnitude.)
Conventional Electronic
and Optical Gear:
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Two conventional
MOS capacitance versus voltage systems with two mercury probes.
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A Kelvin probe
electrostatic voltmeter.
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Several
corona discharge systems for contact-less application of
dielectric bias.
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Vacuum
ultraviolet and ultraviolet illumination systems useful for
flooding oxides with electrons and holes.
Magnetically Shielded
Chamber: A magnetically
shielded chamber is in the laboratory to block out external
magnetic fields. Contained within the chamber is a solenoid
that can produce a very uniform magnetic field in the inside the
chamber. Miscellaneous lab gear:
- Semiconductor parameter analyzer, wire
bonder, wafer probing station, a glove box, two fume
hoods, one small tube furnace, a vacuum system for metal
deposition, one nuclear magnetic resonance Gaussmeter, several
precision Hall
effect Gaussmeters, quite a few common electronics lab items
(electrometers, constant current sources, power supplies,
oscilloscopes, frequency counters, vacuum pumps, etc…) Several
systems for low temperature ESR and SDR measurements.
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