Photoconductivity in LiNbO3 crystals codoped with MgO and Cr2O3

L. Arizmendi, C. De las Heras, F. Jaque, A. Suchocki, S. Kobyakov, T. P. J. Han

Research output: Contribution to journalArticle

3 Citations (Scopus)

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) -> T-4(1) ionic transition band a weak photocurrent is also excited. The photoconductivity is interpreted in terms of Cr3+ ionization and the formation of Nb-Nb(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 Nb-Nb(5+).

LanguageEnglish
Pages123-127
Number of pages5
JournalApplied Physics B: Lasers and Optics
Volume87
Issue number1
DOIs
Publication statusPublished - Mar 2007

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photoconductivity
photocurrents
crystals
polarons
illuminating
excitation
charge carriers
binding energy
ionization
temperature dependence

Keywords

  • lithium-niobate
  • defect structures
  • ions

Cite this

Arizmendi, L., Heras, C. D. L., Jaque, F., Suchocki, A., Kobyakov, S., & Han, T. P. J. (2007). Photoconductivity in LiNbO3 crystals codoped with MgO and Cr2O3. Applied Physics B: Lasers and Optics, 87(1), 123-127. https://doi.org/10.1007/s00340-006-2520-7
Arizmendi, L. ; Heras, C. De las ; Jaque, F. ; Suchocki, A. ; Kobyakov, S. ; Han, T. P. J. / Photoconductivity in LiNbO3 crystals codoped with MgO and Cr2O3. In: Applied Physics B: Lasers and Optics. 2007 ; Vol. 87, No. 1. pp. 123-127.
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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) -> T-4(1) ionic transition band a weak photocurrent is also excited. The photoconductivity is interpreted in terms of Cr3+ ionization and the formation of Nb-Nb(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 Nb-Nb(5+).",
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Arizmendi, L, Heras, CDL, Jaque, F, Suchocki, A, Kobyakov, S & Han, TPJ 2007, 'Photoconductivity in LiNbO3 crystals codoped with MgO and Cr2O3' Applied Physics B: Lasers and Optics, vol. 87, no. 1, pp. 123-127. https://doi.org/10.1007/s00340-006-2520-7

Photoconductivity in LiNbO3 crystals codoped with MgO and Cr2O3. / Arizmendi, L.; Heras, C. De las; Jaque, F.; Suchocki, A.; Kobyakov, S.; Han, T. P. J.

In: Applied Physics B: Lasers and Optics, Vol. 87, No. 1, 03.2007, p. 123-127.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Photoconductivity in LiNbO3 crystals codoped with MgO and Cr2O3

AU - Arizmendi, L.

AU - Heras, C. De las

AU - Jaque, F.

AU - Suchocki, A.

AU - Kobyakov, S.

AU - Han, T. P. J.

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N2 - 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) -> T-4(1) ionic transition band a weak photocurrent is also excited. The photoconductivity is interpreted in terms of Cr3+ ionization and the formation of Nb-Nb(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 Nb-Nb(5+).

AB - 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) -> T-4(1) ionic transition band a weak photocurrent is also excited. The photoconductivity is interpreted in terms of Cr3+ ionization and the formation of Nb-Nb(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 Nb-Nb(5+).

KW - lithium-niobate

KW - defect structures

KW - ions

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Arizmendi L, Heras CDL, Jaque F, Suchocki A, Kobyakov S, Han TPJ. Photoconductivity in LiNbO3 crystals codoped with MgO and Cr2O3. Applied Physics B: Lasers and Optics. 2007 Mar;87(1):123-127. https://doi.org/10.1007/s00340-006-2520-7