1,795 research outputs found
Materials for high-density electronic packaging and interconnection
Electronic packaging and interconnections are the elements that today limit the ultimate performance of advanced electronic systems. Materials in use today and those becoming available are critically examined to ascertain what actions are needed for U.S. industry to compete favorably in the world market for advanced electronics. Materials and processes are discussed in terms of the final properties achievable and systems design compatibility. Weak points in the domestic industrial capability, including technical, industrial philosophy, and political, are identified. Recommendations are presented for actions that could help U.S. industry regain its former leadership position in advanced semiconductor systems production
A low cost direct writing process for flexible circuit and interconnect fabrication
This
thesis
investigates
the
development
of
a
low
cost
fabrication
process
for
flexible
electronics
and
interconnects.
By
using
a
‘direct
writing’
process,
the
use
of
vacuum-‐based
metal
evaporation
and
photoresist
steps
is
not
necessary
and
so
less
complex
equipment
is
needed.
The
process
forms
silver
embedded
on
top
of
a
polyimide
substrate
and
was
first
tested
using
a
UV
laser
to
perform
writing
before
switching
to
a
blue
laser
due
to
excessive
substrate
degradation
observed
from
UV
exposures.
The
blue
light
was
combined
with
a
biologically
friendly
photo
reducing
agent,
which
was
found
to
be
much
more
efficient
at
the
creation
of
silver.
The
methods
of
silver
formation
by
various
means
are
the
main
focus
of
investigation
in
this
thesis
but
process
expansion
and
improvement
were
the
main
goals.
To
this
end,
a
chemical,
rather
than
light-‐based,
process
for
silver
creation
was
found
to
produce
more
consistent
silver
coatings,
however
the
patterning
by
this
method
was
found
to
be
more
challenging.
The
process
was
also
extended
to
a
different
substrate
in
polyetherimide
Advances in electronic packaging technologies by ultra-small microvias, super-fine interconnections and low loss polymer dielectrics
The fundamental motivation for this dissertation is to address the widening interconnect gap between integrated circuit (IC) demands and package substrates specifically for high frequency digital-RF systems applications. Moore's law for CMOS ICs predicts that transistor density on ICs will double approximately every 18 months. The current state-of-the-art in IC package substrates is at 20µm lines/spaces and 50-60µm microvia diameter using epoxy dielectrics with loss tangent above 0.01. The research targets are to overcome the barriers of current technologies and demonstrate a set of advanced materials and process technologies capable of 5-10µm lines and spaces, and 10-30µm diameter microvias in a multilayer 3-D wiring substrate using 10-25µm thin film dielectrics with loss tangent in the <0.005. The research elements are organized as follows with a clear focus on understanding and characterization of fundamental materials structure-processing-property relationships and interfaces to achieve the next generation targets. (a) Low CTE Core Substrate, (b) Low Loss Dielectrics with 25µm and smaller microvias, (c) Sub-10µm Width Cu Conductors, and (d) Integration of the various dielectric and conductor processes.Ph.D.Committee Chair: Tummala, Rao; Committee Member: Iyer, Mahadevan; Committee Member: Saxena, Ashok; Committee Member: Swaminathan, Madhavan; Committee Member: Wong, Chingpin
NASA technology utilization survey on composite materials
NASA and NASA-funded contractor contributions to the field of composite materials are surveyed. Existing and potential non-aerospace applications of the newer composite materials are emphasized. Economic factors for selection of a composite for a particular application are weight savings, performance (high strength, high elastic modulus, low coefficient of expansion, heat resistance, corrosion resistance,), longer service life, and reduced maintenance. Applications for composites in agriculture, chemical and petrochemical industries, construction, consumer goods, machinery, power generation and distribution, transportation, biomedicine, and safety are presented. With the continuing trend toward further cost reductions, composites warrant consideration in a wide range of non-aerospace applications. Composite materials discussed include filamentary reinforced materials, laminates, multiphase alloys, solid multiphase lubricants, and multiphase ceramics. New processes developed to aid in fabrication of composites are given
Attachment methods for advanced spacecraft thermal control materials - An annotated bibliography, phase 1 Summary report supplement
Annotated bibliography on attachment methods for advanced spacecraft thermal control material
JTEC Panel report on electronic manufacturing and packaging in Japan
This report summarizes the status of electronic manufacturing and packaging technology in Japan in comparison to that in the United States, and its impact on competition in electronic manufacturing in general. In addition to electronic manufacturing technologies, the report covers technology and manufacturing infrastructure, electronics manufacturing and assembly, quality assurance and reliability in the Japanese electronics industry, and successful product realization strategies. The panel found that Japan leads the United States in almost every electronics packaging technology. Japan clearly has achieved a strategic advantage in electronics production and process technologies. Panel members believe that Japanese competitors could be leading U.S. firms by as much as a decade in some electronics process technologies
Power Modulation Investigation for High Temperature (175-200 degrees Celcius) Automotive Application
Integrated sensors for process monitoring and health monitoring in microsystems
This thesis presents the development of integrated sensors for health monitoring
in Microsystems, which is an emerging method for early diagnostics of status or
“health” of electronic systems and devices under operation based on embedded
tests. Thin film meander temperature sensors have been designed with a
minimum footprint of 240 m × 250 m. A microsensor array has been used
successfully for accurate temperature monitoring of laser assisted polymer
bonding for MEMS packaging. Using a frame-shaped beam, the temperature at
centre of bottom substrate was obtained to be ~50 ºC lower than that obtained
using a top-hat beam. This is highly beneficial for packaging of temperature
sensitive MEMS devices. Polymer based surface acoustic wave humidity sensors
were designed and successfully fabricated on 128° cut lithium niobate substrates.
Based on reflection signals, a sensitivity of 0.26 dB/RH% was achieved between
8.6 %RH and 90.6 %RH. Fabricated piezoresistive pressure sensors have also
been hybrid integrated and electrically contacted using a wire bonding method.
Integrated sensors based on both LiNbO3 and ZnO/Si substrates are proposed.
Integrated sensors were successfully fabricated on a LiNbO3 substrate with a
footprint of 13 mm × 12 mm, having multi monitoring functions for simultaneous
temperature, measurement of humidity and pressure in the health monitoring
applications
Recent advances in upscalable wet methods and ink formulations for printed electronics
This review deals with the use of solution processing approaches for organic electronics with a focus on material ink formulations as well as on their applicability. The solution processing techniques include methods like gravure printing, screen printing and ink-jet printing. Basic principles of each approach are understood and fundamental correlations between material (metals, semiconductors, and dielectrics) ink properties and final device performances can be drawn. Nevertheless, solution processing methods have the potential to evolve as the most promising tools in organic device fabrication techniques and have already been applied successfully in the fields of organic thin film transistors, solar cells and biosensing devices
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