University of Oulu

Bai, Y., Siponkoski, T., Peräntie, J., Jantunen, H., Juuti, J. (2017) Ferroelectric, pyroelectric, and piezoelectric properties of a photovoltaic perovskite oxide. Applied Physics Letters, 110 (6), 063903. doi:10.1063/1.4974735

Ferroelectric, pyroelectric, and piezoelectric properties of a photovoltaic perovskite oxide

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Author: Bai, Yang1; Siponkoski, Tuomo1; Peräntie, Jani1;
Organizations: 1Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, FI-90014 Oulu, Finlan
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.9 MB)
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Language: English
Published: American Institute of Physics, 2017
Publish Date: 2017-02-10


A perovskite solid-solution, (1-x)KNbO₃-xBaNi₁/₂Nb₁/₂O₃₋δ (KBNNO), has been found to exhibit tunable bandgaps in the visible light energy range, making it suitable for light absorption and conversion applications, e.g., solar energy harvesting and light sensing. Such a common ABO₃–type perovskite structure, most widely used for ferroelectrics and piezoelectrics, enables the same solid-solution material to be used for the simultaneous harvesting or sensing of solar, kinetic, and thermal energies. In this letter, the ferroelectric, pyroelectric, and piezoelectric properties of KBNNO with x = 0.1 have been reported above room temperature. The investigation has also identified the optimal bandgap for visible light absorption. The stoichiometric composition and also a composition with potassium deficiency have been investigated, where the latter has shown more balanced properties. As a result, a remanent polarization of 3.4 μC/cm², a pyroelectric coefficient of 26 μC/m² K, piezoelectric coefficients d₃₃ ≈ 23 pC/N and g₃₃ ≈ 4.1 × 10⁻³ Vm/N, and a direct bandgap of 1.48 eV have been measured for the KBNNO ceramics. These results are considered to be a significant improvement compared to those of other compositions (e.g., ZnO and AlN), which could be used for the same applications. The results pave the way for the development of hybrid energy harvesters/sensors, which can convert multiple energy sources into electrical energy simultaneously in the same material.

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Series: Applied physics letters
ISSN: 0003-6951
ISSN-E: 1077-3118
ISSN-L: 0003-6951
Volume: 110
Issue: 6
Pages: 1 - 5
Article number: 063903
DOI: 10.1063/1.4974735
Type of Publication: A1 Journal article – refereed
Field of Science: 114 Physical sciences
Funding: This work received funding from the European Union’s Horizon 2020 research and innovation program under the Marie Sklodowska-Curie Grant Agreement No. “705437.” Authors J.P. and J.J. acknowledge the funding from the Academy of Finland (Project Nos. 267573, 273663, and 298409). Author T.S. acknowledges the Riitta, J. J. Takanen, T. Tönning, U. Tuominen, the KAUTE, and Emil Aaltonen Foundations and the Infotech Oulu doctoral program for financial support.
EU Grant Number: (705437) NextGEnergy - Next Generation Power Sources for Self-sustainable Devices – Integrated Multi-source Energy Harvesters
Academy of Finland Grant Number: 267573
Detailed Information: 267573 (Academy of Finland Funding decision)
273663 (Academy of Finland Funding decision)
298409 (Academy of Finland Funding decision)
Copyright information: © 2017 AIP Publishing LLC. Article copyright remains as specified within the article.