osnaDocs: Light induced charge transfer processes and pyroelectric luminescence in Sn2P2S6

Light induced charge transfer processes and pyroelectric luminescence in Sn2P2S6

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https://osnadocs.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-2001092814

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DC Field	Value	Language
dc.contributor.advisor	Prof. Dr. Schirmer
dc.creator	Rüdiger, Andreas
dc.date.accessioned	2010-01-30T14:35:15Z
dc.date.available	2010-01-30T14:35:15Z
dc.date.issued	2006-08-28T17:13:06Z
dc.date.submitted	2006-08-28T17:13:06Z
dc.identifier.uri	https://osnadocs.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-2001092814	-
dc.description.abstract	Sn2P2S6 is ferroelectric at room temperature. It is of technological interest in a variety of applications such as pyroelectric motion detectors and the photorefractive effect. Until now the defect structure and the light-induced charge transfer processes in this material have not been subject of a detailed investigation. The main part of this thesis describes and interprets data of electron paramagnetic resonance (EPR), optical absorption spectroscopy and their combination at 10 K to unravel the light-induced sensitization and charge transfer paths. In the photosensitized crystal at excitation with 1.5 eV a hole is transferred from a previously generated Sn3(plus) site to another inequivalent site of the ferroelectric phase. For higher excitation energies another hole present as Fe3(plus) is transferred to S2- creating S-. Optical absorption spectroscopy at room temperature indicates the validity of this model for evelated temperature below the Curie-temperature as well. It is consistent with both our interpretation of EPR spectra and the observation of photoinduced persistent conductivity that electronic bipolarons are the negative charge carriers. An additional chapter interprets a manifestation of pyroelectric luminescence already reported in other pyroelectric materials in terms of an internal Poole-Frenkel-effect induced by the pyroelectric field under changing temperature. The numerical simulation based on published material parameters is in good agreement with the experimental data for both heating and cooling.	eng
dc.language.iso	eng
dc.subject	electron paramagnetic resonance (EPR)
dc.subject	optical absorption spectroscopy
dc.subject	Sn2P2S6
dc.subject	pyroelectrical luminescence
dc.subject	light induced charge transfer
dc.subject.ddc	530 - Physik
dc.title	Light induced charge transfer processes and pyroelectric luminescence in Sn2P2S6	eng
dc.type	Dissertation oder Habilitation [doctoralThesis]	-
thesis.location	Osnabrück	-
thesis.institution	Universität	-
thesis.type	Dissertation [thesis.doctoral]	-
thesis.date	2001-09-07T12:00:00Z	-
elib.elibid	151	-
elib.marc.edt	ulrike.busch	-
elib.dct.accessRights	a	-
elib.dct.created	2001-09-26T15:38:07Z	-
elib.dct.modified	2006-08-28T17:13:06Z	-
dc.contributor.referee	Prof. Dr. Betzler
dc.contributor.referee	PD Dr. Kip
dc.contributor.referee	Dr. Hesse
dc.subject.dnb	29 - Physik, Astronomie	ger
vCard.ORG	FB4	ger
Appears in Collections:	FB06 - E-Dissertationen

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