Publications by April S. Brown.

Papers Published

  1. Metzger, R.A. and Brown, A.S. and Wilson, R.G. and Liu, T. and Stanchina, W.E. and Nguyen, L.D. and Schmitz, A.E. and McCray, L.G. and Henige, J.A., The use of low temperature AlInAs and GaInAs lattice matched to InP in the fabrication of HBTs and HEMTs, Low Temperature (LT) GaAs and Related Materials Symposium (1992), pp. 259 - 64 .
    (last updated on 2007/04/14)

    Abstract:
    AlInAs and GaInAs lattice matched to InP and grown by MBE over a temperature range of 200 to 350°C (normal growth temperature of 500°C) has been used to enhance the device performance of inverted (where the donor layer lies below the channel) High Electron Mobility Transistors (HEMTs) and Heterojunction Bipolar Transistors (HBTs), respectively. The authors show that an AlInAs spacer grown over a temperature range of 300 to 350°C and inserted between the AlInAs donor layer and GaInAs channel significantly reduces Si movement from the donor layer into the channel. This produces an inverted HEMT with a channel charge of 3.0×1012 cm-2 and mobility of 9131 cm2/V-s, as compared to the same HEMT with a spacer grown at 500°C resulting in a channel charge of 2.3×1012 cm-2 and mobility of 4655 cm2/V-s. They also show that a GaInAs spacer grown over a temperature range of 300 to 350°C and inserted between the AlInAs emitter and GaInAs base of an npn HBT significantly reduces Be movements from the base into the emitter, thereby allowing higher Be base dopings (up to 1×1020 cm-3) confined to 500 Å base widths, resulting in an AlInAs/GaInAs HBT with an fmax of 73 GHz and ft of 110 GHz

    Keywords:
    aluminium compounds;gallium arsenide;heterojunction bipolar transistors;high electron mobility transistors;III-V semiconductors;indium compounds;molecular beam epitaxial growth;semiconductor growth;