Transient photocurrents in lead zirconate titanate thin films

Transient photocurrents are investigated in ferroelectric lead zirconate titanate (PZT) films illuminated by laser pulses in the spectral range of 340-380 nm. At low electric fields, the photocurrent is sensitive to the ferroelectric polarization state and changes sign upon the polarization switching. At higher fields, the polarization-independent current proportional to the applied electric field is dominant. The spectral dependence of polarization-dependent current is controlled by the excitation of charge carriers over the forbidden band of PZT having a maximum near 3.5 eV. Possible mechanisms of the observed effect are discussed and the possibilities of a nondestructive read out of polarization state in the ultraviolet spectral range are demonstrated. (C) 1998 American Institute of Physics.


Published in:
Applied Physics Letters, 72, 1, 130-132
Year:
1998
ISSN:
0003-6951
Keywords:
Note:
Kholkin, A Rutgers State Univ, Dept Ceram & Mat Engn, Piscataway, NJ 08854 USA EPFL, DMX, Lab Ceram, Lausanne, Switzerland EPFL, DC, Lab Chim Phys Mol, Lausanne, Switzerland
Yp871
Times Cited:8
Cited References Count:18
Laboratories:




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