Light-induced charge transport processes in photorefractive barium titanate doped with rhodium and iron

Stevendaal, Udo van; Buse, K.; Kämper, S.; Hesse, H.; Krätzig, E.

doi:10.1007/bf01828733

Cited by 33 publications

(15 citation statements)

References 25 publications

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“…Interestingly, for the crystal with a medium degree of reduction the new absorption band in the visible is not observed. Stevendaal et al [23] observed a similar peak at 470 nm ( ¼ 2.7 eV) for reduced BaTiO 3 crystal doped with Rh and Fe in hydrogen environment, but the origin of the peak was not explained. In our case the laser ablation ICP-MS method discribed above did not give evidence for an appreciable iron content inside the crystal.…”

Section: Optical Absorption Spectrummentioning

confidence: 66%

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Growth and characterization of reduced and unreduced Rh doped potassium niobate single crystals

Choubey¹,

Döbeli

Bach³

et al. 2006

Journal of Crystal Growth

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Section: Optical Absorption Spectrummentioning

confidence: 66%

“…As mentioned earlier, reduction might also be performed in KN crystals within a hydrogen atmosphere [7,23]. In this process O-H bonds are created in the KN lattice.…”

Section: Optical Absorption Spectrummentioning

confidence: 99%

Growth and characterization of reduced and unreduced Rh doped potassium niobate single crystals

Choubey¹,

Döbeli

Bach³

et al. 2006

Journal of Crystal Growth

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“…These levels lie about 1.0 and 0.7 eV above the valence band edge [11,18,19] and can be reached by thermal excitation of valence band electrons. They are thus called thermal levels.…”

Section: Discussion Of the Derived Charge Transfer Parametersmentioning

confidence: 99%

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

Veber

Meyer

Schirmer

et al. 2003

J. Phys.: Condens. Matter

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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 BaTiO 3 :Rh, where illumination leads to recharging among the valence states Rh 5+ , Rh 4+ and Rh 3+ . 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.

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“…Dans un tel échantillon, de multiples niveaux énergétiques existent [21][22][23]. Nous n'avons représenté sur la figure 3.a que les principaux niveaux d'énergie électroniques.…”

Section: Présentation Du Modèleunclassified

L'effet photoréfractif

Pauliat

Roosen

1998

l'Optique Non Linéaire Et Ses Matériaux

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Résumé : La souplesse d'emploi des matériaux photoréfractifs est un de leurs principaux attraits. Un même échantillon est sensible sur une plage de longueurs d'onde de plus de 100 nm avec des temps de réponse s'étageant de moins d'une nanoseconde à plus d'une seconde en fonction de la puissance optique mise en jeu. Cette richesse explique le succès de l'effet photoréfractif et aussi les centaines de publications annuelles sur ce sujet. De nombreux matériaux photoréfractifs aux caractéristiques très diverses sont disponibles commercialement. Bien qu'il ne soit pas possible de résumer ici l'ensemble de ces résultats, nous présentons les notions indispensables à la compréhension de ce phénomène nonlinéaire, à l'utilisation de ces matériaux, et au choix des échantillons. Nous n'abordons pas le vaste domaine des applications.

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Light-induced charge transport processes in photorefractive barium titanate doped with rhodium and iron

Cited by 33 publications

References 25 publications

Growth and characterization of reduced and unreduced Rh doped potassium niobate single crystals

Growth and characterization of reduced and unreduced Rh doped potassium niobate single crystals

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

L'effet photoréfractif

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Light-induced charge transport processes in photorefractive barium titanate doped with rhodium and iron

Cited by 33 publications

References 25 publications

Growth and characterization of reduced and unreduced Rh doped potassium niobate single crystals

Growth and characterization of reduced and unreduced Rh doped potassium niobate single crystals

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

L'effet photoréfractif

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