University of Oulu

Y. Bai, P. Tofel, J. Palosaari, H. Jantunen, J. Juuti, A game changer : A multifunctional perovskite exhibiting giant ferroelectricity and narrow bandgap with potential application in a truly monolithic multienergy harvester or sensor. Adv. Mater. 2017, 1700767. DOI: 10.1002/adma.201700767

A game changer : a multifunctional perovskite exhibiting giant ferroelectricity and narrow bandgap with potential application in a truly monolithic multienergy harvester or sensor

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Author: Bai, Yang1; Tofel, Pavel2; Palosaari, Jaakko1;
Organizations: 1Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, Oulu, Finland
2CEITEC – Central European Institute of Technology, Brno, Czech Republic
Format: article
Version: accepted version
Access: embargoed
Persistent link:
Language: English
Published: John Wiley & Sons, 2017
Publish Date: 2018-06-06


An ABO3-type perovskite solid-solution, (K₀.₅Na₀.₅)NbO₃ (KNN) doped with 2 mol% Ba(Ni₀.₅Nb₀.₅)O₃−δ (BNNO) is reported. Such a composition yields a much narrower bandgap (≈1.6 eV) compared to the parental composition—pure KNN—and other widely used piezoelectric and pyroelectric materials (e.g., Pb(Zr,Ti)O₃, BaTiO₃). Meanwhile, it exhibits the same large piezoelectric coefficient as that of KNN (≈100 pC N⁻¹) and a much larger pyroelectric coefficient (≈130 µC m⁻² K⁻¹) compared to the previously reported narrow-bandgap material (KNbO₃)₁₋ₓ-BNNOₓ. The unique combination of these excellent ferroelectric and optical properties opens the door to the development of multisource energy harvesting or multifunctional sensing devices for the simultaneous and efficient conversion of solar, thermal, and kinetic energies into electricity in a single material. Individual and comprehensive characterizations of the optical, ferroelectric, piezoelectric, pyroelectric, and photovoltaic properties are investigated with single and coexisting energy sources. No degrading interaction between ferroelectric and photovoltaic behaviors is observed. This composition may fundamentally change the working principles of state-of-the-art hybrid energy harvesters and sensors, and thus significantly increases the unit-volume energy conversion efficiency and reliability of energy harvesters in ambient environments.

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Series: Advanced materials
ISSN: 0935-9648
ISSN-E: 1521-4095
ISSN-L: 0935-9648
Volume: 29
Issue: 29
Pages: 1 - 7
Article number: 1700767
DOI: 10.1002/adma.201700767
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Funding: This work has received funding from the European Union's Horizon 2020 research and inno vation program under the Marie Sklodowska-Curie grant Agreement No. “705437.” J.J. acknowledges the funding of the Academy of Finland (Project Nos. 267573, 273663, and 298409). P.T. acknowledges the financial support of the Ministry of Education, Youth and Sports of the Czech Republic under the Project No. CEITEC 2020 (LQ1601).
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 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim