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Enhanced Light Extraction in Tunnel Junction Enabled Top Emitting UV LEDs

The efficiency of ultra violet LEDs is critically limited by the absorption losses in p-type and metal layers. In this work, surface roughening based light extraction structures are combined with tunneling-based top-contacts to realize highly efficient top-side light extraction efficiency in UV LEDs. Surface roughening of the top n-type AlGaN contact layer is demonstrated using self-assembled Ni nano-clusters as etch mask. The top surface roughened LEDs were found to enhance external quantum efficiency by over 40% for UV LEDs with a peak emission wavelength of 326 nm. The method described here can enable highly efficient UV LEDs without the need for complex manufacturing methods such as flip chip bonding.

preprint2015arXivOpen access
Yuewei ZhangAndrew AllermanSriram KrishnamoorthyFatih AkyolMichael W. MoseleyAndrew ArmstrongSiddharth Rajan
cond-mat.mtrl-sci
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Yuewei ZhangAndrew AllermanSriram KrishnamoorthyFatih AkyolMichael W. MoseleyAndrew ArmstrongSiddharth Rajan

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