Dominance of radiative recombination from electron-beam-pumped deep-UV AlGaN multi-quantum-well heterostructures
F. Tabataba-Vakili1,2, T. Wunderer1, M. Kneissl1,2,3, Z. Yang1, M. Teepe1, M. Batres1, M. Feneberg4, B. Vancil5, and N.M. Johnson1
Published in:
Appl. Phys. Lett., vol. 109, no. 18, pp. 181105 (2016).
Abstract:
AlGaN-based multiple-quantum-well (MQW) heterostructures were irradiated with a pulsed electron beam. Excitation with a beam energy of 12 keV and a beam current of 4.4mA produced cathodoluminescense at λ = 246 nm with a measured peak output power of >200 mW. The emission is dominated by radiative recombination from the MQW up to the maximum tested excitation power density of 1MW/cm2, as evidenced by unity slope in a double-logarithmic plot of the light output power vs. excitation power density. Monte Carlo simulations of the depth distribution of deposited energy for different beam energies produced good agreement with the measured peak output power vs. beam energy for an assumed carrier diffusion length of ∼200 nm.
1 Palo Alto Research Center, Inc., 3333 Coyote Hill Road, Palo Alto, California 94304, USA
2 Institute of Solid State Physics, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany
3 Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Str. 4, 12489 Berlin, Germany
4 Institut für Experimentelle Physik, Otto-von-Guericke-Universität, Universitätsplatz 2, 39106 Magdeburg, Germany
5 e beam, Inc., 21070 SW Tile Flat Road, Beaverton, Oregon 97007, USA
Key Topics:
Multiple quantum wells, Electron beams, Heterojunctions, Cathodoluminescence, Electric measurements.
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