A Transport Study of AlGaN/GaN Heterostructures Grown on an AlN Substrate

POSTER

Abstract

AlGaN/GaN heterostructures grown on AlN substrates by MOCVD/MEMOCVD technique were investigated using Hall and magnetoresistance measurements. The results indicate the presence of well defined Shubnikov-de Haas (SdH) oscillations which confirm the presence of a good quality two-dimensional electron gas in this structure. The carrier density and mobility were roughly 1.19x10$^{13}$ cm$^{-2}$ and 1100 cm$^{2}$/Vs at room temperature and 1.02x10$^{13}$ cm$^{-2}$ and 5279 cm$^{2}$/Vs at 10 K, respectively. Following illumination, a persistent photocurrent and an increase in the SdH amplitude were observed. Both of these effects are indicative of an increase in the quantum scattering time. The value of the ratio of the classical to the quantum scattering times is within the expected values for the AlGaN/GaN grown on other substrates.

Authors

  • Mo Ahoujja

    Physics, University of Dayton

  • S. Elhamri

    Physics, University of Dayton

  • Rex Berney

    Physics, University of Dayton

  • J.D. Daniel

    Physics, University of Dayton

  • William H. Rauckhorst

    Gothenburg University, Denison University, Bowling Green State University, NASA Glenn Research Center, Ohio Wesleyan University, Nitronex Corporation, 2305 Presidential Drive, Durham, NC, AFRL/MLPS, Wright-Patterson AFB, OH, Miami University, Ursinus College, Purdue University Calumet, GSI, Florida State University, Carnegie Mellon University, Dept. of Health Sciences, Cleveland State University, Physics Dept., Cleveland State University, University of Rochester, OMI College of Applied Science, University of Cincinnati, Davis and Elkins College, WV, Schlumberger-Doll, Korea Institute of Science and Technology, University of Cincinnati, Lock Haven University of Pennsylvania, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6372, Albion College, Albion, MI 49224, University of Toledo, Toledo, OH 43606, Youngstown State University, Joint Institute for Nuclear Research (Dubna), Naval Research Laboratory, ManTech SRS Technologies, Inc., Ecopulse, Inc., Army Research Laboratory, University of Surrey, The Ohio State University, Univ. Akron, Owens Community College, Toledo, OH

  • William H. Rauckhorst

    Gothenburg University, Denison University, Bowling Green State University, NASA Glenn Research Center, Ohio Wesleyan University, Nitronex Corporation, 2305 Presidential Drive, Durham, NC, AFRL/MLPS, Wright-Patterson AFB, OH, Miami University, Ursinus College, Purdue University Calumet, GSI, Florida State University, Carnegie Mellon University, Dept. of Health Sciences, Cleveland State University, Physics Dept., Cleveland State University, University of Rochester, OMI College of Applied Science, University of Cincinnati, Davis and Elkins College, WV, Schlumberger-Doll, Korea Institute of Science and Technology, University of Cincinnati, Lock Haven University of Pennsylvania, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6372, Albion College, Albion, MI 49224, University of Toledo, Toledo, OH 43606, Youngstown State University, Joint Institute for Nuclear Research (Dubna), Naval Research Laboratory, ManTech SRS Technologies, Inc., Ecopulse, Inc., Army Research Laboratory, University of Surrey, The Ohio State University, Univ. Akron, Owens Community College, Toledo, OH