Evidence of deep ultraviolet amplified spontaneous emission in electron beam pumped AlGaN multiple-quantum-well-based structures

A. Yu Nikiforov, W. Zhang, J. Woodward, J. Yin, R. Paiella, K. F. Ludwig, T. D. Moustakas, L. Zhou, David Smith

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

In this paper we report detailed cathodoluminescence (CL) studies of deep UV emitting AlGaN multiple quantum wells (MQWs) embedded in AlN cladding layers to simulate a deep UV laser structure. These structures were produced by plasma-assisted molecular beam epitaxy (MBE) on 6H-SiC substrates. The AlGaN QWs were grown under excess gallium conditions, a growth mode consistent with liquid phase epitaxy rather than physical vapor phase epitaxy. This growth mode leads to AlGaN films with compositional inhomogeneities and thus band structure potential fluctuations. The degree of such compositional inhomogeneities depends on the amount of excess gallium and employment of indium as a surfactant during growth. The structure and microstructure of these MQWs were investigated by x-ray diffraction and TEM/STEM. Their optical properties were investigated with spatially-resolved CL spectroscopy and mapping. E-beam pumping experiments were performed by irradiating the top surface and collecting the luminescence from the cleaved edge. The observed superlinear dependence of the QW CL intensity on beam current together with linewidth narrowing strongly suggests light amplification by stimulated emission.

Original languageEnglish (US)
Title of host publication2012 Lester Eastman Conference on High Performance Devices, LEC 2012
DOIs
StatePublished - Dec 1 2012
Event2012 Lester Eastman Conference on High Performance Devices, LEC 2012 - Providence, RI, United States
Duration: Aug 7 2012Aug 9 2012

Publication series

Name2012 Lester Eastman Conference on High Performance Devices, LEC 2012

Other

Other2012 Lester Eastman Conference on High Performance Devices, LEC 2012
CountryUnited States
CityProvidence, RI
Period8/7/128/9/12

Keywords

  • Deep UV emitting AlGaN quantum wells
  • cathodoluminescence
  • deep UV lasers
  • electron beam pumping
  • molecular beam epitaxy
  • stimulated emission

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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    Nikiforov, A. Y., Zhang, W., Woodward, J., Yin, J., Paiella, R., Ludwig, K. F., Moustakas, T. D., Zhou, L., & Smith, D. (2012). Evidence of deep ultraviolet amplified spontaneous emission in electron beam pumped AlGaN multiple-quantum-well-based structures. In 2012 Lester Eastman Conference on High Performance Devices, LEC 2012 [6410975] (2012 Lester Eastman Conference on High Performance Devices, LEC 2012). https://doi.org/10.1109/lec.2012.6410975