Quantitative determination of charge transfer parameters of photorefractive BaTiO3 : Rh from EPR-based defect studies

Autor(en): Veber, C
Meyer, M
Schirmer, OF
Kaczmarek, M
Stichwörter: ABSORPTION; BARIUM-TITANATE; CRYSTALS; Physics; Physics, Condensed Matter; RHODIUM; TRANSPORT PROCESSES
Erscheinungsdatum: 2003
Herausgeber: IOP PUBLISHING LTD
Journal: JOURNAL OF PHYSICS-CONDENSED MATTER
Volumen: 15
Ausgabe: 3
Startseite: 415
Seitenende: 429
Zusammenfassung: 
Optical absorption bands can be used-as fingerprints of defects and their charge states in insulators and semiconductors. On the basis of the photochromicity usually shown by such materials, a method is introduced by which the optical bands are assigned to the defects and their charge states. It is based on simultaneous measurements of the light-induced changes of the optical absorption and of the corresponding EPR signals. Moreover, indirectly optical bands of EPR-silent defects can also be labelled in this way, strongly widening the scope of EPR based defect studies. We apply this method to the infrared-sensitive photorefractive system BaTiO3:Rh, where illumination leads to recharging among the valence states Rh5+, Rh4+ and Rh3+. The values of all parameters governing the charge transfers responsible are inferred from the magnitude of the absorption bands, the absolute determination of their absorption cross-sections and the kinetics of the absorption changes under illumination. In contrast to previous investigations, these parameters are deduced independently of photorefractive measurements.
ISSN: 09538984
DOI: 10.1088/0953-8984/15/3/307

Show full item record

Page view(s)

1
Last Week
0
Last month
0
checked on Feb 20, 2024

Google ScholarTM

Check

Altmetric