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Investigations on correlation between I-V characteristic and internal quantum efficiency of blue (AlGaIn)N light-emitting diodes

: Binder, M.; Galler, B.; Furitsch, M.; Off, J.; Wagner, J.; Zeisel, R.; Katz, S.


Applied Physics Letters 103 (2013), No.22, Art. 221110, 4 pp.
ISSN: 0003-6951 (Print)
ISSN: 1077-3118
ISSN: 1931-9401 (online)
Journal Article
Fraunhofer IAF ()

We have studied the electrical and optical characteristics of (AlGaIn)N multiple quantum well light-emitting diodes. Minimizing contact effects by utilizing platinum as p-contact metal, ideality factors as low as 1.1 have been achieved. In agreement with basic semiconductor theory, a correlation between ideality factor and small-current efficiency was found. We were able to emulate the experimental current-voltage characteristic over seven orders of magnitude utilizing a two diode model. This model enables a very good prediction of internal quantum efficiency at moderate current densities out of purely electrically derived parameters.