ORCID Profile
0000-0002-0861-2410
Current Organisation
University of Oulu
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Publisher: Wiley
Date: 14-09-2018
Abstract: 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 (K
Publisher: Wiley
Date: 06-08-2020
Publisher: Wiley
Date: 04-01-2022
DOI: 10.1111/JACE.18300
Abstract: Engineering the optical bandgaps of classic ferroelectrics from the typical ultraviolet range down to the visible range is an emerging methodology of developing the next‐generation optoelectric and opto‐ferroelectric devices including ferroelectric solar cells, light‐driven transistors and modulators, and multi‐sensors/energy harvesters. Recently, a material interface comprised of a pseudo‐morphotropic phase boundary between the tungsten bronze and perovskite phases of the KNBNNO [(K,Na,Ba) x (Ni,Nb) y O z ] has been reported to be an effective approach for bandgap engineering while retaining excellent ferroelectricity and piezoelectricity of the perovskite‐phased KNBNNO. However, this approach requires the compositions of the materials to be determined at the synthesis stage, leaving little room for any further modification of the microstructure and functional properties at the post‐processing stage. This paper presents a post‐processing method, that is, atmospheric annealing in N 2 and O 2 , to grow the necessary tungsten bronze phase out of the perovskite phase in the KNBNNO. This method is advantageous over the previously reported because it enables to grow the tungsten bronze–perovskite interface region independent of the initial composition. The distinctive electrical properties and the giant tunability of photoconductivity of the tungsten bronze phase, the perovskite phase, and the interface are characterized in detail in this paper, supporting the exploitation of fabricating opto‐ferroelectric devices using the reported method which is compatible and comparable with some of the post‐processing methods applied in the silicon industry.
Publisher: American Chemical Society (ACS)
Date: 07-08-2020
Publisher: Wiley
Date: 18-03-2019
Publisher: IOP Publishing
Date: 07-08-2023
Abstract: Ambient energy harvesting has great potential to contribute to sustainable development and address growing environmental challenges. Converting waste energy from energy-intensive processes and systems (e.g. combustion engines and furnaces) is crucial to reducing their environmental impact and achieving net-zero emissions. Compact energy harvesters will also be key to powering the exponentially growing smart devices ecosystem that is part of the Internet of Things, thus enabling futuristic applications that can improve our quality of life (e.g. smart homes, smart cities, smart manufacturing, and smart healthcare). To achieve these goals, innovative materials are needed to efficiently convert ambient energy into electricity through various physical mechanisms, such as the photovoltaic effect, thermoelectricity, piezoelectricity, triboelectricity, and radiofrequency wireless power transfer. By bringing together the perspectives of experts in various types of energy harvesting materials, this Roadmap provides extensive insights into recent advances and present challenges in the field. Additionally, the Roadmap analyses the key performance metrics of these technologies in relation to their ultimate energy conversion limits. Building on these insights, the Roadmap outlines promising directions for future research to fully harness the potential of energy harvesting materials for green energy anytime, anywhere.
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Yang Bai.