Colossal Dielectric Constant of Nanocrystalline/Amorphous Homo-Composite BaTiO3 Films Deposited via Pulsed Laser Deposition Technique

We report the pulsed laser deposition (PLD) of nanocrystalline/amorphous homo-composite BaTiO3 (BTO) films exhibiting an unprecedented combination of a colossal dielectric constant (εr) and extremely low dielectric loss (tan δ). By varying the substrate deposition temperature (Td) over a wide range...

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Published in:Nanomaterials (Basel, Switzerland) Switzerland), 2024-10, Vol.14 (20), p.1677
Main Authors: Kondo, Shinya, Murakami, Taichi, Pichon, Loick, Leblanc-Lavoie, Joël, Teranishi, Takashi, Kishimoto, Akira, El Khakani, My Ali
Format: Article
Language:English
Subjects:
Barium titanates
BaTiO3
Carrier transport
colossal dielectric constant
Communication
Crystallization
Current carriers
Dielectric constant
Dielectric loss
Dielectric properties
Electrodes
Grain size
High resolution electron microscopy
Lasers
Morphology
nanocrystalline/amorphous homo-composite
Nanocrystals
Pulsed laser deposition
Pulsed lasers
Scanning electron microscopy
Spectrum analysis
Substrates
Temperature
thin film
Thin films
Transmission electron microscopy
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container_issue 20
container_start_page 1677
container_title Nanomaterials (Basel, Switzerland)
container_volume 14
creator Kondo, Shinya
Murakami, Taichi
Pichon, Loick
Leblanc-Lavoie, Joël
Teranishi, Takashi
Kishimoto, Akira
El Khakani, My Ali
description We report the pulsed laser deposition (PLD) of nanocrystalline/amorphous homo-composite BaTiO3 (BTO) films exhibiting an unprecedented combination of a colossal dielectric constant (εr) and extremely low dielectric loss (tan δ). By varying the substrate deposition temperature (Td) over a wide range (300–800 °C), we identified Td = 550 °C as the optimal temperature for growing BTO films with an εr as high as ~3060 and a tan δ as low as 0.04 (at 20 kHz). High-resolution transmission electron microscopy revealed that the PLD-BTO films consist of BTO nanocrystals (~20–30 nm size) embedded within an otherwise amorphous BTO matrix. The impressive dielectric behavior is attributed to the combination of highly crystallized small BTO nanograins, which amplify interfacial polarization, and the surrounding amorphous matrix, which effectively isolates the nanograins from charge carrier transport. Our findings could facilitate the development of next-generation integrated dielectric devices.
doi_str_mv 10.3390/nano14201677
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subjects Barium titanates
BaTiO3
Carrier transport
colossal dielectric constant
Communication
Crystallization
Current carriers
Dielectric constant
Dielectric loss
Dielectric properties
Electrodes
Grain size
High resolution electron microscopy
Lasers
Morphology
nanocrystalline/amorphous homo-composite
Nanocrystals
Pulsed laser deposition
Pulsed lasers
Scanning electron microscopy
Spectrum analysis
Substrates
Temperature
thin film
Thin films
Transmission electron microscopy
title Colossal Dielectric Constant of Nanocrystalline/Amorphous Homo-Composite BaTiO3 Films Deposited via Pulsed Laser Deposition Technique
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