Optically generated small electron and hole polarons in nominally undoped and Fe-doped KNbO(3) investigated by transient absorption spectroscopy

Autor(en): Torbruegge, S.
Imlau, M. 
Schoke, B.
Merschjann, C.
Schirmer, O. F.
Vernay, S.
Gross, A.
Wesemann, V.
Rytz, D.
Stichwörter: BATIO3; DEFECTS; INDUCED CHARGE-TRANSPORT; LIGHT-INDUCED ABSORPTION; LITHIUM-NIOBATE CRYSTALS; Materials Science; Materials Science, Multidisciplinary; Physics; Physics, Applied; Physics, Condensed Matter
Erscheinungsdatum: 2008
Herausgeber: AMER PHYSICAL SOC
Journal: PHYSICAL REVIEW B
Volumen: 78
Ausgabe: 12
Zusammenfassung: 
Transient light-induced absorption in nominally undoped and Fe-doped KNbO(3) crystals is observed in the visible and infrared spectral ranges after single pulse illumination with lambda= 532 nm. For nominally undoped KNbO(3) the decay of the light-induced absorption in a single step can be explained by incoherent hopping transport of optically generated small bound O-hole and small free Nb(4+) electron polarons and their mutual recombination. Iron doping causes an additional slow decay component and, remarkably, accelerates the initial decay process. A consistent model for the formation, hopping, and recombination paths of hole and electron polarons is deduced from the experimental data set for both nominally undoped and Fe-doped KNbO(3.) The decrease in the polaron hopping-transport length in Fe-doped samples is attributed to the increased number densities of optically generated hole polarons by additional one-quantum excitations.
ISSN: 10980121
DOI: 10.1103/PhysRevB.78.125112

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