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  • 1985-1989  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 4013-4023 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A systematic investigation of deep levels in undoped and doped (Fe, Fe/V, excess of Bi) single crystals of Bi12 GeO20 (BGO) has been performed by photoinduced current transient spectroscopy. A list of traps in the energy range 0.1–1.0 eV with their thermal characteristics and their concentrations has been drawn up. Ten different levels have been detected, a few of them subdividing probably into substructures. In all probability, these trap species are present simultaneously in all the crystals but their concentrations differ considerably (typically from less than 1012 up to 5×1015 cm−3 ) so that dominant levels emerge. Variations in the number, nature, and concentration of the dominant centers were observed from preparation to preparation even for undoped BGO. This makes it difficult to draw reliable conclusions concerning the effect of doping, though some of the observed changes are probably directly related to Fe or Fe/V doping. This study of BGO also enabled us to test the experimental tool that we have worked out and progressively refined.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 528 (1985), S. 202-208 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Photoelektrochemische Untersuchungen von α-Fe2O3-Einkristallenα-Fe2O3 Einkristalle mit relativ hoher Reinheit und stöchiometrischer Zusammensetzung wurden mit Hilfe von photoelektrochemischen Messungen untersucht.Zwei indirekte Elektronenübergänge wurden bei 2,04 und 2,32 eV beobachtet. Sie sind auf Eisen-Eisen-Ladungsübertragungen zurückzuführen.Diese und frühere Ergebnisse zeigen, daß der Unterschied zwischen dem Flachbandpotential und dem Einsatzpotential des Photostromes sich stark mit der Donatorkonzentration erhöht.
    Notes: α-Fe2O3 single crystals of relatively high purity and stoichiometry have been studied using photoelectrochemical techniques. Two indirect electronic transitions are observed at 2.04 and 2.32 eV and are ascribed to iron-iron charge transfers.From the present work and literature data it is shown that the difference between the flat band potential and the photocurrent onset potential increases strongly with the donor concentration.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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