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Confocal photoluminescence characterization of silicon-vacancy color centers in 4H-SiC fabricated by a femtosecond laser

: Liu, J.; Xu, Z.; Song, Y.; Wang, H.; Dong, B.; Li, S.; Ren, J.; Li, Q.; Rommel, M.; Gu, X.; Liu, B.; Hu, M.; Fang, F.

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Nanotechnology and precision engineering 3 (2020), Nr.4, S.218-228
ISSN: 1672-6030
ISSN: 2589-5540
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IISB ()

Silicon-vacancy (VSi) centers in silicon carbide (SiC) are expected to serve as solid qubits, which can be used in quantum computing and sensing. As a new controllable color center fabrication method, femtosecond (fs) laser writing has been gradually applied in the preparation of VSi in SiC. In this study, 4H-SiC was directly written by an fs laser and characterized at 293 K by atomic force microscopy, confocal photoluminescence (PL), and Raman spectroscopy. PL signals of VSi were found and analyzed using 785 nm laser excitation by means of depth profiling and two-dimensional mapping. The influence of machining parameters on the VSi formation was analyzed, and the three-dimensional distribution of VSi defects in the fs laser writing of 4H-SiC was established.