Lithuanian Journal of Physics article / Lietuvos fizikos žurnalo straipsnis

SEMICONDUCTIVE LEAD ZIRCONATE TITANATE THIN FILMS GROWN BY PULSED LASER DEPOSITION
Vadzim Haronin^a, Marin Alexe^b, Robertas Grigalaitis^a, and Jūras Banys^a
^aFaculty of Physics, Vilnius University, Saulėtekio 9, 10222 Vilnius, Lithuania
^bDepartment of Physics, University of Warwick, Coventry CV4 7AL, UK
Email: vadzim.haronin@ff.vu.lt

Received 12 December 2023; revised 15 December 2023; accepted 18 December 2023

Heterostructures consisting of PbZr_0.2Ti_0.8O₃ epitaxial films on a SrTiO₃ (100) substrate with a La_0.67Sr_0.33MnO₃ bottom electrode were prepared by pulsed laser deposition. Plane-parallel capacitor structures were investigated by dielectric spectroscopy and piezoelectric measurement. Shift in a piezoelectric loop indicates that a sample has a small imprinted internal field, directed towards the copper top electrode. Temperature-dependent measurements in a range of 300–500 K were performed to obtain information on the frequency-depending response of the metal–ferroelectric–metal (MFM) structure and to analyze the effect of charge injection through the two Schottky-like contacts. The charge injection process greatly increases the conductivity in the low-frequency region.
Keywords: semiconductors, lead zirconate titanate, thin films, pulsed laser deposition

PUSIAU LAIDŪS PLONIEJI ŠVINO CIRKONATO TITANATO SLUOKSNIAI, IŠAUGINTI IMPULSINIU LAZERINIU GARINIMU
Vadzim Haronin^a, Marin Alexe^b, Robertas Grigalaitis^a, Jūras Banys^a

^aVilniaus universiteto Fizikos fakultetas, 10226 Vilnius, Lietuva
^bVoriko universiteto Fizikos katedra, Koventris, JK

Nevienalyčiai dariniai, kuriuos sudaro PbZr_0,2Ti_0,8O₃ epitaksiniai sluoksniai ant SrTiO₃ (100) padėklo su La_0,67Sr_0,33MnO₃ apatiniu elektrodu, buvo išauginti impulsinio lazerinio nusodinimo būdu. Suformuoti plokščiojo kondensatoriaus dariniai buvo tiriami dielektrine spektroskopija ir pjezoelektriniais matavimais. Pjezoelektrinės kilpos poslinkis rodo, kad bandinyje stebimas nedidelis vidinis liktinis laukas, nukreiptas į viršutinį (vario) elektrodą. Buvo atlikti temperatūriniai matavimai 300–500 K diapazone, siekiant gauti informacijos apie dažninį metalo-feroelektriko-metalo (MFM) darinio atsaką ir išanalizuoti elektronų injekcijos per du Šotkio tipo kontaktus poveikį. Pastebėta, kad krūvio injekcija labai padidina žemadažnį šių nevienalyčių darinių laidumą.

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