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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

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At least 919 records · Page 51
All sourcesNASA NTRSDOE OSTI
NASA NTRS2020

Nonlinear Microwave Interactions with Voltage-Gated Graphene Devices

In this dissertation, methods of fabrication and testing micro- and nano-scaled thermoelectric microwave power detectors based on graphene are explored. Initial detectors show sensitivities of 0.87 mV/mW and each chapter herein describes the iterations and improvements made to the devices. In the end, detectors have shown sensitivities of up to 60.25 mV/mW when accounting for the reflection coefficient of the device, over a 690% increase in sensitivity. Commercially-available detectors that feature zero DC power consumption and operate over similar frequency ranges typically over a power detection sensitivity of 500 mV/mW. However, state-of-the-art thermoelectric detectors based on CMOS and MEMS technologies over power detection sensitivities that are typically lower than 0.4 mV/mW. Unoptimized graphene based detectors have been shown to outperform CMOS and MEMS detectors. An outlook is provided on further optimizations that can be made to the devices.

Michael Robert Gasper↗
NASA NTRS2008

Testing guideline for single event gate rupture (SEGR) of power MOSFETs

The purpose of this document is two-fold. First, the document lists and discusses many of the issues important to understand when testing power MOSFETs. Second, the recommended approach for using radiation test data to define the device application requirements is presented. These include SEE rate calculation, data analysis, and derating guidelines. A significant amount of work has been done on the basic effects of SEB and SEGR. References are supplied where seminal work has been done on the topic at hand. The reader is urged to review the references if the testing issues or mission application at hand are complex.

Scheick, Leif↗