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Ion-implanted In0.1Ga0.9As metal-semiconductor field-effect transistors on GaAs (100) substrates (1989)

Feng, M. ; Wang, G. W. ; Liaw, Y. P. ; [et al.]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 55 (1989), S. 568-569

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ISSN: 1077-3118

Source: AIP Digital Archive

Topics: Physics

Notes: Ion-implanted In0.1Ga0.9As metal-semiconductor field-effect transistors (MESFETs) have been fabricated on 3 in. GaAs (100) substrates. The structure comprises an undoped InGaAs epitaxially layer grown directly on a GaAs (100) substrate by the metalorganic chemical vapor deposition (MOCVD) technique. Si+28 is ion implanted into the InGaAs layer to form an active channel layer. MESFETs with 100 μm gate width and 0.5 μm gate length are fabricated using standard process techniques. The best device shows a maximum transconductance of 426 mS/mm. From S-parameter measurements, the current-gain cutoff frequency ft is 37 GHz and the maximum available gain cutoff frequency fmax is 85 GHz. These results are comparable to InGaAs MESFETs grown by MBE.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.101834

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An evaluation of lightning and corona discharge on thunderstorm air and precipitation chemistry (1990)

Sisterson, D. L. ; Liaw, Y. P.

Springer

Journal of atmospheric chemistry 10 (1990), S. 83-96

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ISSN: 1573-0662

Keywords: Atmospheric lightning chemistry ; corona discharge chemistry ; acid rain ; thunderstorm chemical budgets ; global N budgets ; natural sources of air pollutants

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology , Geosciences

Notes: Abstract This study synthesizes literature to provide a best estimate for the integrated effect of cloud-to-ground lightning, intracloud lightning, and corona discharge on air and precipitation chemistry for an idealized thunderstorm. The cloud volume concentration of NO (the predominant chemical species produced by lightning), assuming all flashes occurred simultaneously in an undiluted, idealized storm volume of 1.5×103 km3, is approximately 0.8 ppbv at STP. Uncertainties are discussed, and assumptions used in this estimate are evaluated and compared to the literature for consistency. Also, NO production values (an average of field, theoretical, and laboratory observations) are used to scale theoretical estimates of other chemical species produced by lightning that can be scavenged by precipitation. The maximum concentrations of these pollutants in rain water are estimated by assuming complete removal of these select, acid rain related species and found to be insignificant.