Suppression of the subband parasitic peak by 1 nm i-AlN interlayer in AlGaN deep ultraviolet light-emitting diodes

Zhang, J. C.; Zhu, Y. H.; Egawa, T.; Sumiya, S.; Miyoshi, M.; Tanaka, M.
September 2008
Applied Physics Letters;9/29/2008, Vol. 93 Issue 13, p131117
Academic Journal
The origin and suppression of the subband parasitic peak in AlGaN deep ultraviolet light-emitting diodes have been studied. The parasitic peak is clarified to come from a p-AlGaN cladding layer and to be related to Mg dopants. By using 1 nm i-AlN as an interlayer between the active region and the p-AlGaN cladding layer, this peak is suppressed efficiently. The devices with such an interlayer show improved output power by a factor of 4 at injection current density of 20 A/cm2, except that the series resistance and turn-on voltage are slightly increased.


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