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Photoconductivity in LiNbO3 crystals codoped with MgO and Cr2O3

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Abstract

The photoconductivity of LiNbO3 crystals codoped with Cr2O3 and different concentrations of MgO from 0 up to 6 mol % is reported. The spectral excitation of photocurrent presents an intense band corresponding to the Cr3+ induced blue absorption edge, but illuminating at the 4 A 2→4 T 1 ionic transition band a weak photocurrent is also excited. The photoconductivity is interpreted in terms of Cr3+ ionization and the formation of NbNb 4+ small polarons as charge carriers. Photoconductivity below about 140 K is suppressed. The analysis of the photocurrent temperature dependence results in a 0.14±0.02 eV binding energy of the polaron at low temperature. Photoconductivity induced by excitation in the intraionic Cr3+ can be explained by a tunnelling process between the excited Cr3+ and the polaron state at the next-nearest-neighbour NbNb 5+.

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Authors and Affiliations

  1. Departamento de Física de Materiales, Universidad Autónoma de Madrid, Cantoblanco, 28049, Madrid, Spain

    L. Arizmendi, C. de las Heras & F. Jaque

  2. Institute of Physics, Polish Academy of Science, Al. Lotnikow 32/46, 02-668, Warsaw, Poland

    A. Suchocki & S. Kobyakov

  3. Department of Physics, University of Strathclyde, John Anderson Building, 107 Rottenrow, Glasgow, G4 ONG, Scotland, UK

    T.P.J. Han

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  1. L. Arizmendi
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  2. C. de las Heras
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  3. F. Jaque
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  4. A. Suchocki
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  5. S. Kobyakov
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  6. T.P.J. Han
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Correspondence to L. Arizmendi.

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PACS

72.40.+w; 72.80.Sk; 77.84.Dy

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Arizmendi, L., de las Heras, C., Jaque, F. et al. Photoconductivity in LiNbO3 crystals codoped with MgO and Cr2O3 . Appl. Phys. B 87, 123–127 (2007). https://doi.org/10.1007/s00340-006-2520-7

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  • DOI: https://doi.org/10.1007/s00340-006-2520-7

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