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+).
| Language | English |
|---|---|
| Pages | 123-127 |
| Number of pages | 5 |
| Journal | Applied Physics B: Lasers and Optics |
| Volume | 87 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - Mar 2007 |
Fingerprint
Keywords
- lithium-niobate
- defect structures
- ions
Cite this
}
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 journal › Article
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.
PY - 2007/3
Y1 - 2007/3
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
U2 - 10.1007/s00340-006-2520-7
DO - 10.1007/s00340-006-2520-7
M3 - Article
VL - 87
SP - 123
EP - 127
JO - Applied Physics B: Lasers and Optics
T2 - Applied Physics B: Lasers and Optics
JF - Applied Physics B: Lasers and Optics
SN - 0946-2171
IS - 1
ER -