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Materials 2017, 10(12), 1396; https://doi.org/10.3390/ma10121396

Effect of Electron Blocking Layer Doping and Composition on the Performance of 310 nm Light Emitting Diodes

1
Ferdinand-Braun-Institut, Leibniz-Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Str. 4, 12489 Berlin, Germany
2
UVphotonics NT GmbH, Gustav-Kirchhoff-Str. 4, 12489 Berlin, Germany
3
Institute of Solid State Physics, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany
*
Author to whom correspondence should be addressed.
Received: 10 November 2017 / Revised: 1 December 2017 / Accepted: 2 December 2017 / Published: 6 December 2017
(This article belongs to the Special Issue Light Emitting Diodes and Laser Diodes: Materials and Devices)
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Abstract

The effects of composition and p-doping profile of the AlGaN:Mg electron blocking layer (EBL) in 310 nm ultraviolet B (UV-B) light emitting diodes (LEDs) have been investigated. The carrier injection and internal quantum efficiency of the LEDs were simulated and compared to electroluminescence measurements. The light output power depends strongly on the temporal biscyclopentadienylmagnesium (Cp 2 Mg) carrier gas flow profile during growth as well as on the aluminum profile of the AlGaN:Mg EBL. The highest emission power has been found for an EBL with the highest Cp 2 Mg carrier gas flow and a gradually decreasing aluminum content in direction to the p-side of the LED. This effect is attributed to an improved carrier injection and confinement that prevents electron leakage into the p-doped region of the LED with a simultaneously enhanced carrier injection into the active region. View Full-Text
Keywords: light emitting diode; LED; ultraviolet; UV; electron blocking layer; EBL; MOVPE; doping; simulation; heterostructure light emitting diode; LED; ultraviolet; UV; electron blocking layer; EBL; MOVPE; doping; simulation; heterostructure
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Kolbe, T.; Knauer, A.; Rass, J.; Cho, H.K.; Hagedorn, S.; Einfeldt, S.; Kneissl, M.; Weyers, M. Effect of Electron Blocking Layer Doping and Composition on the Performance of 310 nm Light Emitting Diodes. Materials 2017, 10, 1396.

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