Global climate imperatives require a worldwide shift away from greenhouse gasemitting activities such as fossil fuel combustion. Concentrated solar thermal installations are particularly appealing as they can store a fraction of their power in the form of heat to provide baseload power, yet current conversion efficiencies prevent them from reaching competitive market prices. One extremely promi...

Patrick Abraham John E. Bowers Department of Electrical and Computer Engineering University of California–Santa Barbara Santa Barbara, California 93106-9560 Abstract. Active refrigeration of optoelectronic components through the use of monolithically grown thin-film solid-state coolers based on III-V materials is proposed and investigated. Enhanced cooling power compared to the thermoelectric e...

We report ultra-high responsivity of epitaxial [Formula: see text] (TGO) Schottky UV-C photodetectors and experimentally identified the source gain as deep-level defects, supported by first principles calculations. Epitaxial TGO films were grown plasma-assisted molecular beam epitaxy on (?201) oriented n-type ?-[Formula: substrates. Fabricated vertical devices exhibited peak responsivities high...

We report the design, fabrication, and preliminary characterization of a compact Xray generator for improved X-ray absorption imaging that uses a nanostructured field emission cathode (FEC) as the electron source and a microstructured transmission anode as the X-ray generating element. FECs consume less power, respond faster, and tolerate lower vacuum than thermionic cathodes used in convention...