Journal
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
Volume 8, Issue 9, Pages 781-784Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/pssr.201409221
Keywords
donor doping; confocal Raman microscopy; lattice vibrations; inhomogeneities; perovskites; SrTiO3
Funding
- Deutsche Forschungsgemeinschaft [SFB 917]
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Confocal Raman microscopy was applied in order to investigate the homogeneity of donor doping in Nb:SrTiO3 single crystals. Measurements of local Raman spectra revealed a systematic relation between the intensity of the Raman signal and the donor content of the crystals. We successfully elaborated a correspondence between the electronic structure and the intensity of the Raman lines using a crystal with macroscopic inhomogeneity as a demonstration sample. By mapping the distribution of the intensity of the Raman signal, we identified a characteristic inhomogeneous structure related to the presence of clusters with sizes of 5 mu m to 20 mu m, indicating inhomogeneous donor distribution caused by flaws introduced during crystal growth. Hence, we propose confocal Raman microscopy as a convenient technique for investigating the homogeneity and quality of doped perovskite surfaces, which are needed for various technological applications. ((c) 2014 WILEY-VCH Verlag GmbH &Co. KGaA, Weinheim)
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