Rapid bimolecular and defect-assisted carrier recombination in hexagonal Boron Nitride

ORAL

Abstract

Hexagonal boron nitride (hBN) is an indirect wide band gap semiconductor that holds great promise for optoelectronic devices in the ultraviolet regime. Here we report the dynamics of photoexcited charge carriers at room temperature in exfoliated monoisotopic 10B enriched hBN. Two recombination mechanisms were identified, and their associated time scales measured, using ultrafast two-photon pump, infrared probe transient transmission spectroscopy. Initially, when the free carrier density is high, bimolecular decay dominates recombination with a rate constant of (1.33 ± 0.09) × 10-7 cm-3/s. At later times, the recombination of the free carriers is characterized by an exponential decay with a time constant on the order of a nanosecond, determined by the density of the impurities/defects in the lattice.

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Presenters

  • Ioannis Chatzakis

    • United States Naval Research Laboratory

Authors

  • Ioannis Chatzakis

    • United States Naval Research Laboratory

  • Roderick Davidson II

    • United States Naval Research Laboratory

  • Adam Dunkelberger

    • United States Naval Research Laboratory

  • Andrea Grafton

    • United States Naval Research Laboratory

  • Joshua D Caldwell

    • Mechanical Engineering Department, , Vanderbilt University, Nashville, TN, USA
    • Mechanical Engineering Dept, Vanderbilt University, Nashville, TN, USA
    • Electrical and Mechanical Engineering, Vanderbilt University

  • Song Liu

    • Tim Taylor Dept. of Chemical Engineering, Kansas State University

  • Jaime A. Freitas, Jr.

    • United States Naval Research Laboratory

  • James Clifford Culbertson

    • United States Naval Research Laboratory
    • Naval Research Laboratory
    • US Naval Research Laboratory

  • James H. Edgar

    • Tim Taylor Department of Chemical Engineering, Kansas State University, Manhattan, Kansas 66506, USA.
    • Kansas State University
    • Tim Taylor Dept. of Chemical Engineering, Kansas State University

  • Daniel Ratchford

    • United States Naval Research Laboratory

  • Chase Ellis

    • United States Naval Research Laboratory

  • Alex Giles

    • United States Naval Research Laboratory

  • Joseph G Tischler

    • United States Naval Research Laboratory

  • Jeffrey Owrutsky

    • United States Naval Research Laboratory
    • U.S. Naval Research Laboratory