Applied Physics A

, 124:257 | Cite as

Ultraviolet laser ablation as technique for defect repair of GaN-based light-emitting diodes

  • Thorsten Passow
  • Michael Kunzer
  • Alexander Pfeuffer
  • Michael Binder
  • Joachim Wagner
Part of the following topical collections:
  1. COLA2017


Defect repair of GaN-based light-emitting diodes (LEDs) by ultraviolet laser micromachining is reported. Percussion and helical drilling in GaN by laser ablation were investigated using 248 nm nanosecond and 355 nm picosecond pulses. The influence of laser ablation including different laser parameters on electrical and optical properties of GaN-based LED chips was evaluated. The results for LEDs on sapphire with transparent conductive oxide p-type contact on top as well as for thin-film LEDs are reported. A reduction of leakage current by up to six orders in magnitude and homogeneous luminance distribution after proper laser defect treatment were achieved.



The authors would like to thank S. Liu and R. Schmidt for valuable contributions. Financial support by the German Federal Ministry for Education and Research (BMBF) within the \(\mu \hbox {AFS}\) research cooperation (funding registration number 13N13285) is gratefully acknowledged.


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Fraunhofer-Institut für Angewandte Festkörperphysik IAFFreiburgGermany
  2. 2.Osram Opto Semiconductors GmbHRegensburgGermany

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