Physics of the Solid State
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Electrical conductivity and interface phenomena in thin-film heterostructures based on lithium niobate and lithium tantalate
Gudkov S. I. 1, Solnyshkin A. V. 1, Zhukov R. N. 2, Kiselev D. A. 2, Semenova E. M. 1, Belov A.N. 3
1Tver State University, Tver, Russia
2National University of Science and Technology MISiS, Moscow, Russia
3National Research University of Electronic Technology (MIET), Zelenograd, Russia
Email: becauseimaphysicist@yandex.ru, a.solnyshkin@mail.ru, rom_zhuk@mail.ru, dm.kiselev@misis.ru, semenova_e_m@mail.ru, nanointech@mail.ru

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In this work, the electrophysical properties of metal-ferroelectric-semiconductor structures - Cu/LiNbO3/Si and Ag/LiTaO3/Si - with a ferroelectric layer thickness of 200 nm have been studied. The ferroelectric layers were deposited by RF magnetron sputtering. A topography study of thin film surface revealed a grain structure. The electrical conductivity mechanisms in Cu/LiNbO3/Si and Ag/LiTaO3/Si were considered. In a dependence of bias voltage value, there are a space charge-limited current, hopping conduction, and Schottky emission in Cu/LiNbO3/Si structures. For Ag/LiTaO3/Si structures, the space charge-limited current and hopping conduction were observed. An asymmetry of the current-voltage characteristics may indicate the presence of a potential barrier at the interface. For the studied structures, the value of the potential barrier was determined Keywords: metal-ferroelectric-semiconductor structures, thin films, lithium niobate, lithium tantalate, electrophysical properties, electrical conductivity, potential barrier.
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