These materials have been incorporated into modulation doped field effect transistors (MODFETs) which displayed high transconductance (140 mS/mm), and large gate to drain breakdown of 340 V for Lgd = 3 microns. Using optimized growth conditions we have observed high 2DEG mobilities or 1500 cm/V*sec and 6000 cm/V*sec at 300 K and 20 K, respectively. Nitridation of the sapphire surface and deposition conditions of the low temperature buffer layer was found to highly influence the performance of GaN/AlGaN modulation doped field effect transistors (MODFETs). MOCVD growth conditions have been found to have a critical influence on the performance of electronic and optoeletronic devices. Mishra, Univ of California-S Barbara, Dept of E&CE, Santa Barbara, CA. Speck, Univ of California-S Barbara, Dept of Materials, Santa Barbara, CA Umesh K. Hu, Univ of California-S Barbara, Dept of E&CE, Santa Barbara, CA J. Coldren, Univ of California-S Barbara, Depts of Materials, Santa Barbara, CA Evelyn L. Bowers, Univ of California-S Barbara, Dept of E&CE, Santa Barbara, CA L. Kapolnek, Univ of California-S Barbara, Dept of Materials, Santa Barbara, CA John E. Mack, Univ of California-S Barbara, Dept of E&CE, Santa Barbara, CA D. Minsky, Kehl Sink, Univ of California-S Barbara, Dept of Materials, Santa Barbara, CA Michael P. Abare, Univ of California-S Barbara, Dept of E&CE, Santa Barbara, CA Y. Keller, Univ of California-S Barbara, Dept of Materials, Santa Barbara, CA Yi-Feng Wu, Peter Kozodoy, Amber C. MOCVD GROWTH OF GROUP-III NITRIDES FOR HIGH QUALITY PHOTONIC AND ELECTRONIC DEVICES, Steven P. In the sessions below "*" indicates an invited paper. K-40 decays into Ar-40 and this process is used in the dating of rocks.John Zolper, Sandia National Laboratories Symposium Support It is also used in gunpowder and glass and plays a vital role in animal cells as one of the partners in the Na-K pump. Potassium is commonly used in fertilizer. It can be found bound to other elements in seawater and minerals and is needed for plant growth.
It reacts violently with water and can even catch fire spontaneously in water. Potassium, the second lightest metal, was discovered by Sir Humphry Davy in 1807. Since potassium is a highly reactive metal, it is always present as a compound, e.g., oxide.Also check for K2s peak, binding energy ~378eV. Assignment of K2p versus C1s feature is possible by identifying spin-orbit components expected for K2p.Weaker K2p peaks can be easily confused with either C1s (CF 2) peaks or C1s satellite structure in aromatic compounds.K2p peak has clearly spaced spin-orbit components (Δ chloride=2.8eV).Often quicker to acquire C1s region and extend range to 305eV to capture K2p region.Binding energies of common chemical states:Ĭharge referenced to adventitious C1s peak at 284.8eV Experimental Information
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