A Combination of Ion Implantation and High‐Temperature Annealing: The Origin of the 265 nm Absorption in AlN
| Autor: | Lukas Peters, Christoph Margenfeld, Jan Krügener, Carsten Ronning, Andreas Waag |
|---|---|
| Rok vydání: | 2022 |
| Předmět: |
carbon
Surfaces and Interfaces high-temperature annealing Condensed Matter Physics Surfaces Coatings and Films Electronic Optical and Magnetic Materials transmittance Materials Chemistry point defects ddc:530 ion implantation Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik Electrical and Electronic Engineering absorption AlN |
| Zdroj: | Physica status solidi : A, Applied research (2022), online first Physica status solidi : A, Applied research |
| ISSN: | 1862-6319 1862-6300 |
| DOI: | 10.1002/pssa.202200485 |
| Popis: | The commonly observed absorption around 265 nm in AlN is hampering the outcoupling efficiency of light-emitting diodes (LEDs) emitting in the UV-C regime. Carbon impurities in the nitrogen sublattice (CN) of AlN are believed to be the origin of this absorption. A specially tailored experiment using a combination of ion implantation of boron, carbon, and neon with subsequent high-temperature annealing allows to separate the influence of intrinsic point defects and carbon impurities regarding this absorption. Herein, the presented results reveal the relevance of the intrinsic nitrogen-vacancy defect VN. This is in contradiction to the established explanation based on CN defects as the defect causing the 265 nm absorption and will be crucial for further UV-LED improvement. Finally, in this article, a new interpretation of the 265 nm absorption is introduced, which is corroborated by density functional theory (DFT) results from the past decade, which are reviewed and discussed based on the new findings. |
| Databáze: | OpenAIRE |
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