University of Oulu

Y. Bai, G. Vats, J. Seidel, H. Jantunen, J. Juuti, Adv. Mater. 2018, 30, 1803821.

Boosting photovoltaic output of ferroelectric ceramics by optoelectric control of domains

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Author: Bai, Yang1; Vats, Gaurav2; Seidel, Jan2;
Organizations: 1Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu
2School of Materials Science and Engineering, Faculty of Science, University of New South Wales
Format: article
Version: submitted version
Access: open
Online Access: PDF Full Text (PDF, 0.6 MB)
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Language: English
Published: John Wiley & Sons, 2018
Publish Date: 2019-09-14


Photo‐ferroelectric single crystals and highly oriented thin‐films have been extensively researched recently, with increasing photovoltaic energy conversion efficiency (from 0.5% up to 8.1%) achieved. Rare attention has been paid to polycrystalline ceramics, potentially due to their negligible efficiency. However, ceramics offer simple and cost‐effective fabrication routes and stable performance compared to single crystals and thin‐films. Therefore, a significantly increased efficiency of photo‐ferroelectric ceramics contributes toward widened application areas for photo‐ferroelectrics, e.g., multisource energy harvesting. Here, all‐optical domain control under illumination, visible‐range light‐tunable photodiode/transistor phenomena and optoelectrically tunable photovoltaic properties are demonstrated, using a recently discovered photo‐ferroelectric ceramic (K0.49Na0.49Ba0.02)(Nb0.99Ni0.01)O2.995. For this monolithic material, tuning of the electric conductivity independent of the ferroelectricity is achieved, which previously could only be achieved in organic phase‐separate blends. Guided by these discoveries, a boost of five orders of magnitude in the photovoltaic output power and energy conversion efficiency is achieved via optical and electrical control of ferroelectric domains in an energy‐harvesting circuit. These results provide a potentially supplementary approach and knowledge for other photo‐ferroelectrics to further boost their efficiency for energy‐efficient circuitry designs and enable the development of a wide range of optoelectronic devices.

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Series: Advanced materials
ISSN: 0935-9648
ISSN-E: 1521-4095
ISSN-L: 0935-9648
Volume: 30
Issue: 43
Article number: 1803821
DOI: 10.1002/adma.201803821
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Funding: This work received funding from the European Union’s Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant agreement number 705437. J.J. acknowledges the funding from the Academy of Finland (project numbers 267573, 273663, and 298409). J.S. acknowledges support by the Australian Research Council through Discovery grants.
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: © 2018 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim. This is the pre-peer reviewed version of the following article: Y. Bai, G. Vats, J. Seidel, H. Jantunen, J. Juuti, Adv. Mater. 2018, 30, 1803821, which has been published in final form at This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.