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Comparison of dielectric properties of additively manufactured vs. solvent cast polyimide dielectrics

IEEE Transactions on Dielectrics and Electrical Insulation

Appelhans, Leah A.; Keicher, David M.; Lavin, Judith M.

The permittivity, dielectric loss, and DC dielectric breakdown strength of additively manufactured, solvent-cast, and commercial polyimide films are reported As expected, commercial films performed better than both AM and solvent-cast lab-made films. Solvent-cast films generally performed better than AM films, although performance depended on the optimization of the material for the specific deposition technique. The most significant degradation of performance in all the lab-made films was in the dispersion of both the x/Df measurements and the dielectric breakdown strength (Weibull β). Commercial films had a breakdown strength of 4891 kV/cm and β = 13.0 whereas the highest performing lab-made films had a breakdown strength of 4072 kV/cm and β = 3.8. Furthermore, this increase in dispersion in all the lab-made samples is attributed to higher variability in the preparation, a higher defect level related to fabrication in the lab environment and, for some AM samples, to morphology/topology features resulting from the deposition technique.

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TYPE Journal Article YEAR 2016
DOIOSTI

Next Generation Photovoltaic Technologies For High-Performance Remote Power Generation (Final Report)

Lentine, Anthony L.; Nielson, Greg N.; Riley, Daniel R.; Okandan, M.; Sweatt, W.C.; Jared, Bradley H.; Resnick, Paul J.; Kim, B.; Kratochvil, Jay; Anderson, B.J.; Cruz-Campa, J.L.; Gupta, Vipin P.; Tauke-Pedretti, Anna; Cederberg, J.G.; Paap, Scott M.; Sanchez, Carlos A.; Nordquist, Christopher N.; Saavedra, Michael P.; Ballance, Mark H.; Nguyen, J.; Alford, Charles A.; Nelson, John S.; Lavin, Judith M.; Clews, P.; Pluym, Tammy P.; Wierer, J.; Wang, George T.; Biefeld, Robert M.; Luk, Ting S.; Brener, Igal B.; Granata, J.; Aguirre, Brandon A.; Haney, Mike; Agrawal, Gautam; Gu, Tian

A unique, micro-scale architecture is proposed to create a novel hybrid concentrated photovoltaic system. Micro-scale (sub-millimeter wide), multi-junction cells are attached to a large-area silicon cell backplane (several inches wide) that can optimally collect both direct and diffuse light. By using multi- junction III-V cells, we can get the highest possible efficiency of the direct light input. In addition, by collecting the diffuse light in the large-area silicon cell, we can produce power on cloudy days when the concentrating cells would have minimal output. Through the use of micro-scale cells and lenses, the overall assembly will provide higher efficiency than conventional concentrators and flat plates, while keeping the form factor of a flat plate module. This report describes the hybrid concept, the design of a prototype, including the PV cells and optics, and the experimental results.

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TYPE SAND Report YEAR 2016
DOIOSTI
Results 26–50 of 58
Results 26–50 of 58