Technologies
Sub Categories
Other Categories
Electronics
Ohmic contact degradation and gate-sinking are two major degradation mechanisms that cause semiconductor devices, such as high electron mobility transistors, or HEMTs, to fail. In general, the rapid diffusion of contact
metals into the indium phosphide substrates has restricted processing temperatures to 300ºC and reliable operating temperatures have been limited to 200ºC to 250ºC.
This set of technologies embodies two similar methods for improving reliability and performance of contacts in indium phosphide-based semiconductors.
The ability to increase the functionality and complexity of micro/nanofluidic devices is currently limited by the capacity to accurately detect the position of fluids within them.
While an increased number of electrical sensors can improve detection capabilities, the presence of too many external electrical connections makes integration into the micro/nanofluidic network difficult and complicated.
This invention is a method for connecting large arrays of electrical micro/nanofluidic sensors to external monitoring equipment, while using only a limited number of leads.
Electro-spinning is a method for mass production of long polymeric nanofibers in a continuous non-woven form. The large variability in fabrication conditions and parameters in conjunction with the large surface-to-volume ratio of individual fibers can give rise to a spectrum of mechanical behavior that may deviate significantly from bulk.
This invention uses a micro-device as a miniature stress machine and an optical microscope to capture the motion of said micro-device.
Thermal sensitivity in piezoresistive sensors used in silicon microcantilevers makes them susceptible to unwanted signals such as temperature drift. In addition, when used in chemical sensing, current microcantilevers have difficulty testing femtogram (10-15) scale samples due to the effect of temperature variations on the mechanical signal.
This invention is a microcantilever hotplate with both a resistive heater and temperature-compensated piezoresistive strain gauges that correct for the effect of temperature variations on the mechanical strain signal.
This technology is a method to eliminate voltage overshoot in cables used to connect AC electric motors and pulse width modulation (PWM) inverters. As a function of cable length and voltage rise time, voltage overshoot occurs when high frequency currents reflect between the motor and source ends of a cable. University of Illinois researchers have devised a compensator that shapes the output of the PWM inverter in order to eliminate these reflections; the method only requires knowledge of the transmission line characteristic impedance and propagation delay. This technique e