Article
Nanoscience & Nanotechnology
Adriana Augurio, Alberto Alvarez-Fernandez, Vishal Panchal, Bede Pittenger, Peter De Wolf, Stefan Guldin, Joe Briscoe
Summary: This study reports the preparation of porous barium titanate (pBTO) thin films using a soft template-assisted sol-gel method, and the control of porosity by different organic/inorganic ratios. The research shows that ferroelectric polarization is retained in the porous structures, and the presence of porosity leads to an improvement in PEC response.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Xiqi Chen, Zhongbin Pan, Yong Zhang, Huanhuan Li, Jinghao Zhao, Luomeng Tang, Jinjun Liu, Peng Li, Jiwei Zhai
Summary: A universal approach to delaying saturation polarization in BaTiO3-based ceramic is reported, which improves the capacitive performance. The ceramic exhibits an ultrahigh recoverable energy density and high efficiency, as well as wide stability in frequency, temperature, and cycling fatigue. This work offers a promising pathway for high-energy-density ceramic capacitors and pulse power applications.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Physics, Applied
M. Dossena, G. Malavena, A. S. Spinelli, C. Monzio Compagnoni
Summary: This paper presents a comprehensive modeling investigation of the Pt/BaTiO3/Nb:SrTiO3 stack designed as a Ferroelectric Tunnel Junction (FTJ), with a focus on specific material features often overlooked. The analysis includes validation through a consistent comparison with experimental data, exploring the resistive memory window of the FTJ, and providing insights for the development of next-generation memory technologies based on FTJ.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Multidisciplinary Sciences
Hwa Seob Choi, Shunning Li, In-Hyeok Park, Weng Heng Liew, Ziyu Zhu, Ki Chang Kwon, Lin Wang, In-Hwan Oh, Shisheng Zheng, Chenliang Su, Qing-Hua Xu, Kui Yao, Feng Pan, Kian Ping Loh
Summary: The authors demonstrate that the coercive field of organic perovskite materials can be increased by modulating the strength of hydrogen bonds, and highlight the potential for tailoring the coercive field by tuning hydrogen bond strength.
NATURE COMMUNICATIONS
(2022)
Article
Engineering, Environmental
Mengwei Tian, Xiangjun Liu, Ao Gong, Shan Zhang, Guangcheng Wang, Pei Han, Yong Li, Xiaojie Lou, Xihong Hao
Summary: High-efficiency photodetection properties were achieved in a hexagonal Y1-xBixMnO3 ferro-electric self-powered photodetector using a multiscale polarity structure optimization strategy. The photodetector based on Y0.95Bi0.05MnO3 (YBMO5) can work in a wide band ranging from ultraviolet to near infrared with excellent responsivity and detectivity, and a fast response time of only 0.3/0.4 ms.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Physics, Applied
N. V. Sarath, Amit Chauhan, Jatin Kumar Bidika, Subhajit Pal, B. R. K. Nanda, P. Murugavel
Summary: This study proposes a novel lead-free ferroelectric material, (1-x)BTO - xBi(Ni2/3Nb1/3)O-3, which is demonstrated to reduce the bandgap without compromising the polarization. By varying the composition from x = 0.0 to 0.05, the bandgap is reduced from 3.1 to 2.4 eV. The optimal composition, chi = 0.02, exhibits enhanced polarization and anomalous photovoltaic response at room temperature, with an open-circuit voltage of 6 V at 300 K. The origin of the bandgap reduction and polarization retention is explored experimentally and analyzed theoretically.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Physical
Dong Chen, Chun-Lei Wang
Summary: The study demonstrates a strong magnetoelectric coupling in a La0.75Sr0.25MnO3/BaTiO3 superlattice, achieving reversible transitions between ferromagnetism, ferrimagnetism, and antiferromagnetism by controlling the magnitude and spin direction of the Mn magnetic moments.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Chemistry, Physical
Xu Hou, Yuechao Duan, Ziqi Wang, Qingshan Lu
Summary: Introducing polarization effect by constructing a BaTiO3/AgAlO2 heterostructure improves the photocatalytic performance, inhibits charge carrier recombination, and enhances the separation efficiency of photoinduced carriers.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Arti, Reema Gupta, S. P. Singh, Rajan Walia, Vinod Kumar, Vivek Verma
Summary: Bismuth ferrite has been extensively studied as a potential material for photovoltaic and photo-catalytic applications. Co-doping with rare-earth and transition elements can modify its properties and improve its performance in multiferroic, ferroelectric, photovoltaic, and photocatalytic applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Xuemin Shen, Zhichen Wu, Wendong Lu, Mingming Chen, Peiyu Cheng, Sixue Chen, Yuan Liu, Quan Wang, Dawei Cao
Summary: This study prepared ferroelectric PZT thin films using a low-cost sol-gel method and introduced an Au interlayer to improve its ferroelectric properties. Based on this structure, high-performance self-powered photodetectors were obtained, with performance surpassing most of the previously reported similar devices.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Materials Science, Multidisciplinary
Chen Xi Li, Xiang Li, Xin Yi Chen, Chen Chen, Lei Zhao, Nan Ma
Summary: This study proposes a solution of Ti3+ self-doping in BTO ceramic to balance the piezoelectric, pyroelectric, and photovoltaic properties. Ti3+ self-doping reduces the bandgap and enables good ferroelectric properties in BTO, resulting in improved piezoelectric coefficient, pyroelectric coefficient, and photocurrent under illumination. Ti3+ self-doped BTO shows great potential for multisensory applications.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Physical
Wushuang Han, Kewei Liu, Jialin Yang, Xing Chen, Qiu Ai, Yongxue Zhu, Zhen Cheng, Binghui Li, Lei Liu, Dezhen Shen
Summary: This study demonstrates a high-performance self-powered UV-visible photodetector enhanced by the ferroelectric effect on amorphous BaTiO3/p-Si heterojunction. The device achieves significantly improved responsivities of 14 mA/W, 27 mA/W, and 223 mA/W at 254 nm, 365 nm, and 600 nm, respectively, outperforming other BaTiO3-based self-driven photodetectors reported. The device also exhibits a fast response speed with rising/fall times of 450 μs/460 μs at 254 nm and 80 μs/140 μs at 600 nm. The defect-assisted recombination of photogenerated carriers at the amorphous BaTiO3/p-Si interface and grain boundaries enables the visualization of transient photocurrent spikes under 254 nm illumination. This work presents a novel strategy for the design and research of high-performance self-powered photodetectors.
APPLIED SURFACE SCIENCE
(2023)
Article
Energy & Fuels
Irene Carrai, Raffaello Mazzaro, Elena Bassan, Giacomo Morselli, Alberto Piccioni, Silvia Grandi, Stefano Caramori, Paola Ceroni, Luca Pasquini
Summary: The solar-driven oxidation of biomass to valuable chemicals is being explored as a promising anodic reaction in photoelectrochemical cells, with the aim of replacing the slow oxygen evolution reaction and improving energy conversion efficiency. In this study, the photooxidation of 5-hydroxymethylfurfural into furan dicarboxylic acid (FDCA) was carried out in a basic aqueous environment using titanium-modified hematite (Ti:Fe2O3) photoanodes. The addition of Co-based cocatalysts, specifically cobalt iron oxide (CoFeO x ) and cobalt phosphate (CoPi), improved the performance of the photoanodes, particularly the electrode modified with CoPi, which showed enhanced efficiency and selectivity towards FDCA production. The improved performance is attributed to the cocatalyst's effect on charge carrier dynamics and suppression of recombination processes.
Article
Physics, Applied
Yongdan Zhu, Meng Zhao, Yuan Zhang, Teng Zhang, Hai Zhou
Summary: This letter introduces a BaTiO3/Nb:SrTiO3 heterostructure that exhibits both resistive switching and photovoltaic response characteristics. The resistive switching can be modulated by light illumination, which is attributed to the migration of photogenerated carriers and charge trapping/detrapping. This research helps to understand the multifunctional properties of the heterostructure and provides new possibilities for its practical applications in memory and optoelectronic devices.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Applied
Min Zhou, Xinyang Lu, Zewen Wu, Yiqun Xie, Yanxia Xing, Yin Wang
Summary: In this study, the electron transport properties of the LaNiO3/BaTiO3/LaNiO3 FTJ with a low concentration of OVs were investigated using NECPA-DFT, revealing that OVs play a critical role in determining the electron transport properties of an FTJ. The tunnel electroresistance ratio monotonously increases with the OVs concentration, reaching 5898% for a 9% OVs concentration.
APPLIED PHYSICS LETTERS
(2021)
Article
Nanoscience & Nanotechnology
Nathalie Jedrecy, Vishal Jagtap, Christian Hebert, Loic Becerra, David Hrabovsky, Antoine Barbier, Xavier Portier
Summary: The study demonstrates a bipolar resistance switch in the multiferroic BTO/LSMO system, highlighting the crucial role of ionic exchanges and redox processes at interfaces in ferroelectric bound charge screening and resistive switching.
ADVANCED ELECTRONIC MATERIALS
(2021)
Article
Chemistry, Physical
Pierre-Marie Deleuze, Helene Magnan, Antoine Barbier, Mathieu Silly, Bruno Domenichini, Celine Dupont
Summary: In this study, water adsorption and dissociation on undoped and Ti-doped hematite thin films were investigated using experimental and theoretical methods. It was found that Ti doping can reduce the hydroxylation level and induce wide structural modifications of the surface, preventing full hydroxylation.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Multidisciplinary Sciences
Romeo Juge, Naveen Sisodia, Joseba Urrestarazu Larranaga, Qiang Zhang, Van Tuong Pham, Kumari Gaurav Rana, Brice Sarpi, Nicolas Mille, Stefan Stanescu, Rachid Belkhou, Mohamad-Assaad Mawass, Nina Novakovic-Marinkovic, Florian Kronast, Markus Weigand, Joachim Graefe, Sebastian Wintz, Simone Finizio, Joerg Raabe, Lucia Aballe, Michael Foerster, Mohamed Belmeguenai, Liliana D. Buda-Prejbeanu, Johan Pelloux-Prayer, Justin M. Shaw, Hans T. Nembach, Laurent Ranno, Gilles Gaudin, Olivier Boulle
Summary: This study successfully observed isolated skyrmions in synthetic antiferromagnets and confirmed their properties and control mechanisms through micromagnetic simulations and an analytical model. Furthermore, the study demonstrated the formation of synthetic antiferromagnetic skyrmions using current and light.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Pierre-Marie Deleuze, Helene Magnan, Antoine Barbier, Zheshen Li, Alberto Verdini, Luca Floreano, Bruno Domenichini, Celine Dupont
Summary: In this paper, synchrotron radiation photoemission techniques were used to investigate the properties of the Ba 4d components, Ba(alpha) and Ba(beta). Different behaviors were observed for Ba(alpha) and Ba(beta) in photoelectron diffraction experiments. DFT calculations supported the findings, showing that Ba(alpha) mainly originates from the topmost BaO layer, while Ba(beta) comes predominantly from the surface BaO plane.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Instruments & Instrumentation
Geraldine Hallais, Charles Renard, Antoine Barbier, Eric Imbernon, Nicolas Fourches
Summary: The development of high radiation hardness pixel arrays for large detector systems in high energy physics is crucial. The DoTPiX, a pixel device based on a quantum well, has a buried Ge layer that acts as a current modulation gate. Different methods, such as low temperature epitaxial growth and the use of Si thermal oxide or deposited oxide, are being studied to achieve the prerequisites for DoTPiX operation.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2023)
Article
Materials Science, Multidisciplinary
Kedar Sharma, Lionel Calmels, Dongzhe Li, Antoine Barbier, Remi Arras
Summary: In this study, the effects of structural point defects on electronic and magnetic properties of CoFe2O4 and NiFe2O4 materials were investigated using first-principles calculations. The results demonstrate that a deviation from the perfectly inverse cation distribution increases the magnetization and decreases the band gap at the Fermi level, while oxygen vacancies do not strongly affect the magnetization. Additionally, it was found that NiFe2O4 crystals with an excess of Ni cations can exhibit spin-polarized hole conductivity.
PHYSICAL REVIEW MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Stefan Stanescu, Theio Alun, Yannick J. Dappe, Dris Ihiawakrim, Ovidiu Ersen, Dana Stanescu
Summary: By annealing Ti-doped hematite photoanodes under nitrogen, a strongly enhanced photocurrent of more than 200% was achieved, which can be attributed to the oxidized surface states and increased density of charge carriers.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Spectroscopy
Stefan Stanescu, Dana Stanescu, Adam Hitchcock
Summary: We performed a STXM study on hematite nanorods, a typical photoanode for solar water splitting. The nanorods were synthesized via hydrothermal growth using FeCl3 as the precursor. The onset potential for water splitting was found to be smaller compared to epitaxially grown hematite photoanodes. STXM revealed the presence of a hexahydrate iron chloride phase at the nanorods' surface, which is responsible for the low onset potential values. We described the quantification approach used to analyze the specific microstructure of individual hematite nanorods.
JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA
(2023)
Article
Chemistry, Inorganic & Nuclear
A. N. Salak, J. P. Cardoso, D. D. Khalyavin, A. Barbier, P. Fertey, S. M. Mikhalev, N. M. Olekhnovich, A. V. Pushkarev, Yu V. Radyush, A. Stanulis, R. Ramanauskas
Summary: Crystal structures and temperature/pressure behaviors of high-pressure synthesized perovskite phases in the (1-x)BiFe0.5Sc0.5O3-xLaFe0.5Sc0.5O3 (0 ≤ x ≤ 1) system were studied. Antipolar Pnma structure with V2ap x 4ap x 2V2ap superstructure was observed for x ≤ 0.05, while incommensurately modulated Imma(00 gamma)s00 structure was found for 0.10 ≤ x ≤ 0.33. Non-polar Pnma phase was stable for x ≥ 0.34. The transformation between these phases was reversible with temperature and pressure.
JOURNAL OF SOLID STATE CHEMISTRY
(2023)
Article
Instruments & Instrumentation
Jaianth Vijayakumar, Hao Yuan, Nicolas Mille, Stefan Stanescu, Sufal Swaraj, Vincent Favre-Nicolin, Ebrahim Najafi, Adam P. Hitchcock, Rachid Belkhou
Summary: The challenges and importance of soft X-ray spectro-ptychography in the low-energy range are discussed. Results of low-energy soft X-ray spectro-ptychography at 180 eV are presented, showcasing its capabilities on various nanostructures. The optimization of low-energy X-ray spectro-ptychography, challenges in measurement approaches and reconstruction algorithms, as well as the evaluation of radiation dose increase with overlapping sampling, are discussed.
JOURNAL OF SYNCHROTRON RADIATION
(2023)
Article
Materials Science, Multidisciplinary
Nicolas Mille, Hao Yuan, Jaianth Vijayakumar, Stefan Stanescu, Sufal Swaraj, Kewin Desjardins, Vincent Favre-Nicolin, Rachid Belkhou, Adam P. Hitchcock
Summary: This study reports the progress of ptychography imaging, spectroscopy, and linear dichroism measurements at the carbon K-edge. Compared to conventional Scanning Transmission X-ray Microscopy (STXM), ptychography provides improved spatial resolution and image quality. Ptychography at the carbon K-edge offers unique opportunities to perform high-resolution spectromicroscopy on organic materials.
COMMUNICATIONS MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Anyssa Derj, Helene Magnan, Cristian Mocuta, Patrick Le Fevre, Jocelyne Leroy, Antoine Barbier
Summary: Epitaxial perovskite self-oxidized oxynitride N : BaTiO3 thin films were successfully obtained by atomic nitrogen assisted molecular beam epitaxy on 1% Nb-doped SrTiO3(001) single crystals without supplying additional oxygen gas. Compared to pure BaTiO3 films grown with atomic oxygen on the same substrate, the oxynitride films exhibited more tetragonal perovskite crystalline structures, profound electronic structure modifications, improved photo-electrochemical properties, and an enhanced optical window for light absorption.
MATERIALS ADVANCES
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
A. Gupta, D. Radisic, J. W. Maes, O. Varela Pedreira, J-P Soulie, N. Jourdan, H. Mertens, S. Bandyopadhyay, Q. T. Le, A. Pacco, N. Heylen, K. Vandersmissen, K. Devriendt, C. Zhu, S. Datta, F. Sebaai, S. Wang, M. Mousa, J. Lee, J. Geypen, B. De Wachter, B. Chehab, S. M. Salahuddin, G. Murdoch, S. Biesemans, Zs Tokei, E. Dentoni Litta, N. Horiguchi
Summary: This study focuses on metal exploration for buried power rail (BPR) and Via-to-BPR (VBPR) for the 1 nm technology node, optimizing tungsten metallization stack for lower line resistivity and reducing contact resistance. Introducing molybdenum at the BPR level and comparing its performance with other metals for scaled BPR CDs, new Mo dry & wet etch processes were developed for Mo-BPR recess and VBPR contact formation.
2021 IEEE INTERNATIONAL ELECTRON DEVICES MEETING (IEDM)
(2021)
