title: Micro Photo Detector Fabricated of Ferroelectric-Metal Heterostructure.
abstract: The anomalous photovoltaic effect (APE) in ferroelectric thin films has been utilized for the development of an optical micro-detector active in the visible range (from 350 to 800 nm). La-doped Pb(Zr,Ti)O(3) (PLZT) ferroelectric films epitaxially grown on Pt(001)/Mg(001) substrate were fabricated into micro-detector arrays and characterized as to their optical response. The Au/PLZT/Pt/MgO device was self-polarized in the as-deposited form with the polarization vector perpendicular to film surface. The heterostructure photovoltage response ranged from 100 to 200 mV, and the photocurrent was ~30 nA/cm(2) for devices of ~250 μm diameter under illumination of 100 mW/cm(2) at wavelengths from 400 to 580 nm. Such micro-detectors can be used for optical sensors in MEMS devices as well as for electrical stimulators of biological cells.
authors.affiliation: Texas Center for Superconductivity and Advanced Materials, University of Houston, Houston, TX 77204-5004, U.S.A.
authors.forename: A
authors.initials: A
authors.lastname: Zomorrodian
authors.forename: N J
authors.initials: NJ
authors.lastname: Wu
authors.forename: Y
authors.initials: Y
authors.lastname: Song
authors.forename: S
authors.initials: S
authors.lastname: Stahl
authors.forename: A
authors.initials: A
authors.lastname: Ignatiev
authors.forename: E Brady
authors.initials: EB
authors.lastname: Trexler
authors.forename: C A
authors.initials: CA
authors.lastname: Garcia