ORCID Profile
0000-0002-3446-9881
Current Organisation
National Renewable Energy Laboratory
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Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C5EE03641K
Abstract: This work examines the potential of PbZr 0.53 Ti 0.47 O 3 /CoFe 2 O 4 (PZT/CFO) multi-layered nanostructures (MLNs) to achieve a giant electrocaloric effect (ECE) and enhanced pyroelectric energy harvesting.
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: 23-04-2023
Abstract: Metal halide perovskite based materials have emerged over the past few decades as remarkable solution‐processable optoelectronic materials with many intriguing properties and potential applications. These emerging materials have recently been considered for their promise in low‐energy memory and information processing applications. In particular, their large optical cross‐sections, high photoconductance contrast, large carrier‐diffusion lengths, and mixed electronic/ionic transport mechanisms are attractive for enabling memory elements and neuromorphic devices that are written and/or read in the optical domain. Here, recent progress toward memory and neuromorphic functionality in metal halide perovskite materials and devices where photons are used as a critical degree of freedom for switching, memory, and neuromorphic functionality is reviewed.
Publisher: Informa UK Limited
Date: 06-2015
Publisher: Wiley
Date: 18-03-2019
Publisher: Elsevier BV
Date: 02-2019
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C8NA00123E
Abstract: Nanocrystalline Ce-substituted yttrium iron garnet (YIG) powders of different compositions, Y 3−x Ce x Fe 5 O 12 (0 ≤ x ≤ 2.0), were synthesized by a combination of sol–gel auto-combustion and solid-state synthesis techniques.
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8TC03965H
Abstract: The structure and elemental distribution of PbZrO 3 thin films are investigated. Defect controlled electrocaloric effects are discussed.
Publisher: Wiley
Date: 17-10-2013
DOI: 10.1111/IJAC.12063
Publisher: Wiley
Date: 19-12-2014
DOI: 10.1111/IJAC.12364
Publisher: American Chemical Society (ACS)
Date: 07-08-2020
Publisher: Wiley
Date: 03-09-2013
DOI: 10.1111/IJAC.12168
Publisher: Informa UK Limited
Date: 03-2014
Publisher: Elsevier BV
Date: 03-2019
Publisher: Tsinghua University Press
Date: 06-2013
Publisher: Informa UK Limited
Date: 22-02-2016
Publisher: World Scientific Pub Co Pte Lt
Date: 10-2014
DOI: 10.1142/S2010135X14500295
Abstract: This work emphasis on the competence of (100)-oriented PMN–PT buffer layered (0.68 PbMg 1/3 Nb 2/3 O 3 –0.32 PbTiO 3 with Pb ( Zr 0.3 Ti 0.7 ) O 3 / PbO x buffer layer) and (001)-oriented PMN–PT (0.67 PbMg 1/3 Nb 2/3 O 3 –0.33 PbTiO 3 ) for low grade thermal energy harvesting using Olsen cycle. Our analysis (based on well-reported experiments in literature) reveals that these films show colossal energy harnessing possibility. Both the films are found to have maximum harnessable energy densities (PMN–PT buffer layered: 8 MJ/m 3 PMN–PT: 6.5 MJ/m 3 ) in identical ambient conditions of 30–150°C and 0–600 kV/cm. This energy harnessing plausibility is found to be nearly five times higher than the previously reported values to date.
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D0EE03897K
Abstract: A detailed explanation of the calculations for the electrocaloric effect (ECE) performance of thin-film heterostructures for motivating the scientific community to carry out experiments for validation.
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6EE01013J
Abstract: Demonstration of pyroelectric control of magnetization in ferroelectric/magnetic/ferroelectric multi-layered nanostructures for tuning thermomagnetic energy conversion efficiency and magnetocaloric effect.
Publisher: Elsevier BV
Date: 08-2014
Publisher: Informa UK Limited
Date: 02-01-2015
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0TC01300E
Abstract: We demonstrate a unique capability to control the formation and properties of skin layer structures in relaxor ferroelectrics by adjusting defect concentration. It is shown that the skin layer is polar and both electrically and optically active.
Publisher: AIP Publishing
Date: 03-01-2014
DOI: 10.1063/1.4861031
Abstract: This article demonstrates the colossal energy harvesting capability of a lead-free (Bi0.5Na0.5)0.915-(Bi0.5K0.5)0.05Ba0.02Sr0.015TiO3 ceramic using the Olsen cycle. The maximum harvestable energy density estimated for this system is found to be 1523 J/L (1523 kJ/m3) where the results are presented for extreme ambient conditions of 20–160 °C and electric fields of 0.1–4 MV/m. This estimated energy density is 1.7 times higher than the maximum reported to date for the lanthanum-doped lead zirconate titanate (thin film) system. Moreover, this study introduces a generalized and effective solid state refrigeration cycle in contrast to the ferroelectric Ericson refrigeration cycle. The cycle is based on a temperature induced polarization change on application of an unipolar electric field to ferroelectric ceramics.
Publisher: IOP Publishing
Date: 28-10-2022
Abstract: The discovery of ferroelectricity in HfO 2 -based thin films brings tremendous opportunities for emerging ferroelectric memories as well as for synaptic devices. The origin of ferroelectricity in this material is widely attributed to the presence of a polar orthorhombic phase. However, a new ferroelectric rhombohedral phase displaying large polarization with no need of pre-cycling, has more recently been reported in epitaxial Hf 0.5 Zr 0.5 O 2 (HZO). In this work, the switching mechanism of the rhombohedral phase of HZO films is characterized by a two-stage process. In addition, the synaptic behaviour of this phase is presented, comparing it with previous reports on orthorhombic or non-epitaxial films. Unexpected similarities have been found between these structurally distinct systems. Even though the epitaxial films present a larger coercive field, the ration between the activation field for intrinsic polarization switching and the coercive field ( F a / E c ) has been found to be close to 2, in agreement with that reported for other hafnia s les. This is about 5 times smaller than in most other ferroelectrics, confirming this characteristic as a unique feature of hafnia-based ferroelectrics.
Publisher: Wiley
Date: 13-09-2020
Abstract: Low‐energy switching of ferroelectrics is currently being investigated for energy‐efficient nanoelectronics. While conventional methods employ electrical fields to switch the polarization state, mechanical switching is investigated as an interesting alternative low‐energy switching concept, if low enough pressures could be achieved. Here, the thickness‐dependent mechanical and electrical switching behavior of ferroelectric PbZr 0.48 Ti 0.52 O 3 /YBa 2 Cu 3 O 7− δ (PZT/YBCO) epitaxial heterostructures grown on single crystalline LaAlO 3 ‐(001) pseudo‐cubic (LAO) substrate is reported. Mechanical switching is found under relatively low force (600 nN estimated pressure ≈0.21 GPa) in atomic force microscopy‐based measurements. Mechanically switched domains can be erased by small electric fields and, interestingly, exhibit a surface potential change similar to electrically poled areas. The feasibility of switching these heterostructures with very low pressure makes them promising candidates for nanoscale electromechanical devices.
Publisher: Wiley
Date: 02-2014
Publisher: Springer Science and Business Media LLC
Date: 06-2016
Publisher: Wiley
Date: 06-08-2020
Publisher: American Association for the Advancement of Science (AAAS)
Date: 27-03-2020
Abstract: We report on scaling, rotation, and channeling behavior of helical and skyrmion spin textures in thin films of Te-doped Cu 2 OSeO 3 .
Publisher: Elsevier BV
Date: 05-2016
Publisher: Informa UK Limited
Date: 02-01-2016
Publisher: Wiley
Date: 21-01-2014
DOI: 10.1111/IJAC.12214
Publisher: Wiley
Date: 22-08-2019
Abstract: An insight into the analogies, state-of-the-art technologies, concepts, and prospects under the umbrella of perovskite materials (both inorganic-organic hybrid halide perovskites and ferroelectric perovskites) for future multifunctional energy conversion and storage devices is provided. Often, these are considered entirely different branches of research however, considering them simultaneously and holistically can provide several new opportunities. Recent advancements have highlighted the potential of hybrid perovskites for high-efficiency solar cells. The intrinsic polar properties of these materials, including the potential for ferroelectricity, provide additional possibilities for simultaneously exploiting several energy conversion mechanisms such as the piezoelectric, pyroelectric, and thermoelectric effect and electrical energy storage. The presence of these phenomena can support the performance of perovskite solar cells. The energy conversion using these effects (piezo-, pyro-, and thermoelectric effect) can also be enhanced by a change in the light intensity. Thus, there lies a range of possibilities for tuning the structural, electronic, optical, and magnetic properties of perovskites to simultaneously harvest energy using more than one mechanism to realize an improved efficiency. This requires a basic understanding of concepts, mechanisms, corresponding material properties, and the underlying physics involved with these effects.
Publisher: IOP Publishing
Date: 26-02-2014
Location: United States of America
Location: India
Start Date: 2020
End Date: 2022
Funder: European Commission
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