Highly reliable nitride-based LEDs with SPS+ITO upper contacts

Nitride-based blue light emitting diodes (LEDs) with an n/sup +/-short period superlattice (SPS) tunnel contact layer and an indium tin oxide (ITO) transparent contact were fabricated. Compared with conventional nitride-based LEDs with Ni/Au upper contacts, it was found that we could achieve a 60% i...

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Bibliographic Details
Published in:IEEE journal of quantum electronics 2003-11, Vol.39 (11), p.1439-1443
Main Authors: Chang, S.J., Chang, C.S., Su, Y.K., Chuang, R.W., Lin, Y.C., Shei, S.C., Lo, H.M., Lin, H.Y., Ke, J.C.
Format: Article
Language:English
Subjects:
Automotive materials
Deposition
Electroluminescence
Gallium nitride
Gold
Indium tin oxide
Infrared radiation
Leakage current
Light emitting diodes
MOCVD
Nickel
Ohmic contacts
Optical materials
Quantum electronics
Quantum well devices
Spark plasma sintering
Superlattices
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Description
Summary:Nitride-based blue light emitting diodes (LEDs) with an n/sup +/-short period superlattice (SPS) tunnel contact layer and an indium tin oxide (ITO) transparent contact were fabricated. Compared with conventional nitride-based LEDs with Ni/Au upper contacts, it was found that we could achieve a 60% increase in electroluminescence (EL) intensity by using ITO upper contacts. However, it was also found that the lifetime of ITO LEDs were much shorter. Furthermore, it was found that we could achieve a longer lifetime and a smaller reverse leakage current (I/sub R/) by the deposition of a SiO/sub 2/ layer on top of the ITO LEDs.
ISSN:0018-9197
1558-1713
DOI:10.1109/JQE.2003.818312