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Photo-conductivity transient processes of Fe:LiNbO3 congruent crystals are investigated by electro-chemical analyzer. The experiments are executed with Fe:LiNbO3 crystals of different Fe concentrations in the conditions of different laser intensities. The results show that the transient photo-conductivity of the Fe-doped lithium niobate crystal is formed through a complex process of electron transport; the decay of photo-conductivity can be fitted to an exponential function and a stretched-exponential function. The dependences of the fitting parameters on laser intensity and iron-doped concentration are measured. The values of amplitudes σ1max, σ2max, time constant τ2 and stretching factor β increase strongly at low intensities, and τ2 and β reach their saturation value for higher intensities; with the increase of the concentration of Fe ions, the values of σ1max, σ2max and τ2 incerease, but β decreases. With experimental results, we propose a charge transfer model which includes the migration of electrons in the conduction band and the jumping of electrons between small-polarons. The model better explains the main features of photo-conductivity decay for Fe-doped congruent lithium niobate crystals.
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Keywords:
- lithium niobate /
- photo-conductivity /
- decay /
- charge transport
[1] Giinter P, Huignard J P 1988 Topics Appl. Phys. 61 295
[2] Wong K K 2002 Properties of Lithium Niobate (London: INSPEC) p113
[3] Fu B, Zhang G Q, Liu X M, Shen Y, Xu Q J, Kong Y F, Chen S L, Xu J J 2008 Acta Phys. Sin. 57 2946 (in Chinese) [付博, 张国权, 刘祥明, 申岩, 徐庆君, 孔勇发, 陈绍林, 许京军 2008 57 2946]
[4] Carnicer J, Caballer O, Carrascos M，Cabrera J M 2004 Appl. Phys. B Laser Opt. 79 351
[5] Lüdtke F, Waasem N, Buse K, Sturman B 2011 Appl. Phys. B 105 35
[6] Jermann F, Otten J 1993 J. Opt. Soc. Am. B 10 2085
[7] Zylbersztejn A 1976 Appl. Phys. Lett. 29 778
[8] Josch W, Münser R, Ruppel W, Würfel P 1978 Ferroelectrics 21 623
[9] Carnicero J, Carrascosa M, García G, Agulló-López F 2005 Phys. Rev. B 72 245108
[10] Yang B, Yan X N, Lu C Y 2010 Acta Photonic Sinica 39 214 (in Chinese) [杨冰, 阎晓娜, 路灿云 2010 光子学报 39 214]
[11] Berben D, Buse K, Wevering S 2000 Appl. Phys. 87 1034
[12] Herth P, Schaniel D, Woike Th 2005 Phys. Rev. B 71 125128
[13] Sturman B, Carrascosa M, Agullo-Lopez F 2008 Phys. Rev. B 78 245114
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[1] Giinter P, Huignard J P 1988 Topics Appl. Phys. 61 295
[2] Wong K K 2002 Properties of Lithium Niobate (London: INSPEC) p113
[3] Fu B, Zhang G Q, Liu X M, Shen Y, Xu Q J, Kong Y F, Chen S L, Xu J J 2008 Acta Phys. Sin. 57 2946 (in Chinese) [付博, 张国权, 刘祥明, 申岩, 徐庆君, 孔勇发, 陈绍林, 许京军 2008 57 2946]
[4] Carnicer J, Caballer O, Carrascos M，Cabrera J M 2004 Appl. Phys. B Laser Opt. 79 351
[5] Lüdtke F, Waasem N, Buse K, Sturman B 2011 Appl. Phys. B 105 35
[6] Jermann F, Otten J 1993 J. Opt. Soc. Am. B 10 2085
[7] Zylbersztejn A 1976 Appl. Phys. Lett. 29 778
[8] Josch W, Münser R, Ruppel W, Würfel P 1978 Ferroelectrics 21 623
[9] Carnicero J, Carrascosa M, García G, Agulló-López F 2005 Phys. Rev. B 72 245108
[10] Yang B, Yan X N, Lu C Y 2010 Acta Photonic Sinica 39 214 (in Chinese) [杨冰, 阎晓娜, 路灿云 2010 光子学报 39 214]
[11] Berben D, Buse K, Wevering S 2000 Appl. Phys. 87 1034
[12] Herth P, Schaniel D, Woike Th 2005 Phys. Rev. B 71 125128
[13] Sturman B, Carrascosa M, Agullo-Lopez F 2008 Phys. Rev. B 78 245114
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