Ultrafast Carrier Dynamics in Nitride-based wide band gap semiconductors: Hexagonal Boron Nitride and Aluminum Nitride

ORAL

Abstract

We used time-resolved pump-probe spectroscopy with sub-picosecond resolution to observe free carrier dynamics in hexagonal boron nitride (h-BN) and aluminum nitride (AlN). The samples were excited by two-photon excitation with a pump pulse at 267 nm and probed by an infrared beam spectrally tuned to the edge of the Reststrahlen band (e.g. 1650 cm-1for h-BN). We observed strong Reststrahlen band softening with the injection of carriers due to the (LO)- phonon free-carrier plasma coupling effect. Lifetimes were observed from a few picoseconds to nanoseconds in h-BN and AlN.

–

Presenters

  • Ioannis Chatzakis

    • Electronics Science & Technology Division, ASEE/U.S. Naval Research Laboratory

Authors

  • Ioannis Chatzakis

    • Electronics Science & Technology Division, ASEE/U.S. Naval Research Laboratory

  • Roderick B. Davidson II

    • Chemistry Division, U.S. Naval Research Laboratory

  • Adam Dunkelberger

    • Chemistry Division, U.S. Naval Research Laboratory
    • Chemistry Division, Naval Research Laboratory
    • Naval Research Lab

  • Daniel Ratchford

    • Chemistry Division, U.S. Naval Research Laboratory

  • Joshua Caldwell

    • Department of Mechanical Engineering, Vanderbilt University
    • Electrical and Mechanical Engineering, Vanderbilt

  • Scott Katzer

    • Naval Research Laboratory
    • Electronics Science & Technology Division, US Naval Research Laboratory

  • David Storm

    • Electronics Science & Technology Division, US Naval Research Laboratory

  • Alexander Giles

    • Electronics Science & Technology Division, US Naval Research Laboratory

  • Chase Ellis

    • Electronics Science & Technology Division, US Naval Research Laboratory

  • Joseph Tischler

    • Electronics Science & Technology Division, US Naval Research Laboratory

  • Jeffrey Owrutsky

    • Naval Research Lab
    • Chemistry Division, U.S. Naval Research Laboratory
    • Chemistry Division, Naval Research Laboratory
    • Chemistry Division, US Naval Research Laboratory