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Direct Measurement of Auger Electrons Emitted from a Semiconductor Light-Emitting Diode under Electrical Injection: Identification of the Dominant Mechanism for Efficiency Droop

We report on the unambiguous detection of Auger electrons by electron emission spectroscopy from a cesiated InGaN/GaN light emitting diode (LED) under electrical injection. Electron emission spectra were measured as a function of the current injected in the device. The appearance of high energy electron peaks simultaneously with an observed drop in electroluminescence efficiency shows that hot carriers are being generated in the active region (InGaN quantum wells) by an Auger process. A linear correlation was measured between the high energy emitted electron current and the "droop current" - the missing component of the injected current for light emission. We conclude that the droop phenomenon in GaN LED originates from the excitation of Auger processes.

preprint2013arXivOpen access
Justin IvelandLucio MartinelliJacques PerettiJames S. SpeckClaude Weisbuch
cond-mat.mtrl-sci
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Justin IvelandLucio MartinelliJacques PerettiJames S. SpeckClaude Weisbuch

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