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(Mn, Sb) Doped-PZT/YBa2Cu3O7-y Heterostructure for IR Detector Array

Published online by Cambridge University Press:  10 February 2011

Y. Q. Xu ,
N. J. Wu ,
D. Liu  and
A. Ignatiev
Y. Q. Xu
Affiliation:
Space Vacuum Epitaxy Center and Texas Center for Superconductivity, University of Houston, Houston, TX 77204-5507
N. J. Wu
Affiliation:
Space Vacuum Epitaxy Center and Texas Center for Superconductivity, University of Houston, Houston, TX 77204-5507
D. Liu
Affiliation:
Space Vacuum Epitaxy Center and Texas Center for Superconductivity, University of Houston, Houston, TX 77204-5507
A. Ignatiev
Affiliation:
Space Vacuum Epitaxy Center and Texas Center for Superconductivity, University of Houston, Houston, TX 77204-5507
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Abstract

Mn and Sb doped-PZT (PMSZT)/YBa2Cu3O7−y (YBCO) heterostructures have been integrated with YSZ/Si substrates for fabrication of infrared (IR) detector arrays. PMSZT films with good epitaxy on c-oriented YBCO conducting oxide electrodes have been successfully grown by a pulsed laser ablation deposition. The ferroelectric properties of the PMSZT films show good hystersis loops with a coercive field Ec, of 70 kV/cm and a remnant polarization Pr, of 15μC/cm2. I-V curves show that the PMSZT films have high electrical field breakdown strength with values exceeding 400kV/cm. Doping Mn and Sb into PZT has been shown to not only decrease the Curie temperature Tc from 350°C for PZT to 175°C for PMSZT, but also to enhance the IR responsivity of the pyroelectric thin films. PMSZT detectors have a pyroelectric coefficient of 45nC/cm2K at 25°C and 148nC/cm2K at 88°C, and pyroelectric figures of merit, Fv of 15.5 × 10−11 C. cm/J and Fd of 9.5 × 10−9 C. cm/J at 25°C. The measured normalized detectivity D* in the 2.5μm--19.5μm wavelength range varies from 2.5×108cm. Hz1/2/W to 6.0×108cm. Hz1/2/W.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 493: Symposium U – Ferroelectric Thin Film VI , 1997 , 481
Copyright
Copyright © Materials Research Society 1998

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