Article
Materials Science, Multidisciplinary
Nirmal Roy, Sayantan Ghosh, Suprotim Saha, G. L. Prajapati, Rahul Dagar, D. S. Rana, S. S. Banerjee
Summary: In this study, the metal-insulator transition (MIT) phenomenon was investigated in a NdNiO3 thin film with a thickness variation induced strain distribution. It was found that the film exhibited homogeneous current distribution above the MIT temperature, while a nonuniform current distribution appeared below the MIT temperature, with the insulating phase spreading from thicker to thinner regions of the film.
Article
Engineering, Electrical & Electronic
Umar Sidik, Azusa N. Hattori, Ken Hattori, Musa Alaydrus, Ikutaro Hamada, Liliany N. Pamasi, Hidekazu Tanaka
Summary: Researchers demonstrate tunable proton diffusion within perovskite lattice by regulating structural strain and reveal the significant role of strain in controlling proton diffusion in the RNiO3 system.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Laura Rodriguez, Felip Sandiumenge, Carles Frontera, Jose Manuel Caicedo, Jessica Padilla, Gustau Catalan, Jose Santiso
Summary: The complex phase and microstructural trajectories across the metal-insulator transition in strained VO2 films involve the formation of transient metastable phases near a thermodynamic triple point. The detailed analysis using in-situ synchrotron X-ray diffraction reveals subtle complexities in the structure of epitaxial films, with local stresses inducing a transformation from the M1 phase to the triclinic phase and ultimately to the monoclinic M2 phase. This transformation path provides essential insights for understanding the electronic and mechanical properties of the films at the nanoscale.
Article
Physics, Multidisciplinary
A. Stupakiewicz, C. S. Davies, K. Szerenos, D. Afanasiev, K. S. Rabinovich, A. V. Boris, A. Caviglia, A. V. Kimel, A. Kirilyuk
Summary: Researchers have achieved switching of magnetization in magnetic garnet films by ultrafast resonant excitation of longitudinal optical phonon modes, revealing the magneto-elastic mechanism of the switching. In contrast, excitation of strongly absorbing transverse phonon modes results in a thermal demagnetization effect only.
Article
Physics, Applied
J. W. Adkins, I. Fina, F. Sanchez, S. R. Bakaul, J. T. Abiade
Summary: In this study, the influence of controllable polarization reversal and built-in electric fields on pyroelectric and electrocaloric effects in a BaTiO3 thin film is examined using a modified indirect method. It is found that the magnitude of the sample's change in polarization with temperature is sensitive to the degree of polarization reversal. The pyroelectric response is small at low fractions of switched polarization and grows larger with higher fractions of reversal. This is attributed to the destabilizing effect of the internal built-in field on low fractions of switched polarization.
APPLIED PHYSICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
A. A. Bassou, P. J. Machado, M. M. Gomes, B. Manjunath, R. Vilarinho, B. Silva, J. Oliveira, B. Almeida, A. Almeida, J. R. Fernandes, L. S. Fernandes, J. Agostinho Moreira, P. B. Tavares
Summary: This study focused on the co-precipitation synthesis, thermal stability, and decomposition process of NdNiO3 phase under 1 bar of oxygen pressure. It was found that using a 1% molar excess of Nd and annealing at around 900 degrees C at 1 bar of O-2 can yield an almost pure NdNiO3-delta phase with a certain oxygen deficiency. Further heating resulted in the decomposition of NdNiO3-delta phase into Nd4Ni3O10 and NiO compounds. Structural parameters and Raman spectra were provided for the compounds studied.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Fiza Mumtaz, G. Hassnain Jaffari, G. Shabir Khan
Summary: In this study, the local structure of BiFeO3 has been systematically manipulated and its correlation with the electronic structure has been examined in detail. By substituting Eu3+ ions, the structural modification affected bond length, bond angle, and octahedral rotation, leading to a higher symmetry configuration. The changes in electronic transitions and the emergence of 4f levels of the rare earth substituent have been investigated as a function of local changes at the unit cell level. The forbidden electronic transition 6A1g -> 4T1g in a centrosymmetric configuration has also been discussed.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Chemistry, Physical
Yunfei Hong, Junkai Deng, Xiangdong Ding, Jun Sun, Jefferson Zhe Liu
Summary: In this study, the ferroelectric polarization in bismuthene nanoribbons was investigated using first-principles calculations, and a width size limiting effect arising from edge effects was discovered. The decrease in width led to the spontaneous transformation of the zigzag and armchair paired nanoribbons into high-symmetric nonpolarized nanoribbons. The phase transition mechanism involving depolarization field and edge stress provides insights for achieving phase transition and ultrahigh piezoelectricity in Bi nanoribbons through strain engineering, which could enable new applications for 2D ferroelectric devices.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Runnan Yu, Rui Shi, Zhangwei He, Tao Zhang, Shuang Li, Qianglong Lv, Shihao Sha, Chunhe Yang, Jianhui Hou, Zhan'ao Tan
Summary: Fine-tuning the thermodynamic self-assembly of molecules using volatile solid additives has been proven to be an effective method for constructing high-performance organic solar cells. By designing and applying three-dimensional structured solid molecules, the formation of organized molecular assembly in the active layer is facilitated. The strategy of using three-dimensional additives to induce ordered self-assembly structure represents a practical approach for rational morphology control in highly efficient devices.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Moloud Kaviani, Ulrich Aschauer
Summary: Complex oxide functionality, such as ferroelectricity, magnetism or superconductivity, is often achieved in epitaxial thin-film geometries. However, the stability and electronic structure of oxygen vacancies, which are the dominant type of defect in these materials, have been primarily studied in bulk or strained bulk, neglecting the interfaces and surfaces present in thin-film geometries. In this study, density functional theory calculations were used to investigate oxygen vacancies in a SrMnO3 thin film grown on a SrTiO3 substrate. The results show that surface and interface effects lead to significant differences in the stability and electronic structure of oxygen vacancies in thin-film geometries compared to the (strained) bulk.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Runnan Yu, Rui Shi, Zhangwei He, Tao Zhang, Shuang Li, Qianglong Lv, Shihao Sha, Chunhe Yang, Jianhui Hou, Zhan'ao Tan
Summary: Fine-tuning the thermodynamic self-assembly of molecules using volatile solid additives is an effective approach to construct high-performance organic solar cells. In this study, three-dimensional structured solid molecules were designed and applied to facilitate the formation of organized molecular assembly in the active layer. By optimizing the morphology, the efficiency of the solar cells reached over 19%.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Multidisciplinary Sciences
Zengguang Cheng, Tara Milne, Patrick Salter, Judy S. Kim, Samuel Humphrey, Martin Booth, Harish Bhaskaran
Summary: The research demonstrates the potential of using nanometer-scale metals to enhance light-matter interactions, with antimony as a pure metal capable of optically programmable transitions between two states. Its application prospects lie in optoelectronic modulation and switching speed, showcasing the simplicity and potential for various optoelectronic applications requiring actively tunable metallic conductors.
Article
Computer Science, Interdisciplinary Applications
Nikita Kruk, Jose A. Carrillo, Heinz Koeppl
Summary: The continuum description of active particle systems is a useful tool for analyzing the dynamics of a large number of particles, but the equations often appear as complex nonlinear integro-differential equations. This paper proposes a general framework of finite volume methods to numerically solve partial differential equations of chiral active particle systems, demonstrating the method's performance on both spatially homogeneous and inhomogeneous problems. The study investigates phase transitions of specific problems in both spatially homogeneous and inhomogeneous regimes, reporting the existence of different first and second order transitions.
JOURNAL OF COMPUTATIONAL PHYSICS
(2021)
Article
Physics, Applied
X. M. Cui, W. J. Zhai, Y. Zhang, L. Huang, Y. S. Tang, C. F. Li, Y. Q. Li, L. Lin, Z. B. Yan, X. P. Jiang, J-M Liu
Summary: This study discusses various approaches to constructing modified thermodynamic potentials under epitaxial thin film boundary conditions, establishing the equivalence of these potentials and utilizing K0.5Na0.5NbO3 thin films as an example for practical calculations. It also examines a set of misfit strain-strain phase diagrams and discusses scenarios for choosing different thermodynamic potentials for ferroelectric thin films.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
Judith Gabel, Matthias Pickem, Philipp Scheiderer, Lenart Dudy, Berengar Leikert, Marius Fuchs, Martin Stuebinger, Matthias Schmitt, Julia Kuespert, Giorgio Sangiovanni, Jan M. Tomczak, Karsten Held, Tien-Lin Lee, Ralph Claessen, Michael Sing
Summary: Thin films of transition metal oxides are affected by oxygen adatoms on the surface, leading to the formation of an electronically dead surface layer and altering the band filling and electron correlations. It is important to consider the presence of surface apical oxygen when predicting the behavior of ultrathin films of transition metal oxides.
ADVANCED ELECTRONIC MATERIALS
(2022)
Article
Oncology
Jun Cao, Yaner Yu, Yangkun Zhou, Qing Ji, Wenkang Qian, Dongdong Jia, Gu Jin, Yajun Qi, Xin Li, Ningning Li, Tao Li, Meiyu Fang, Hongchuan Jin
Summary: Sinonasal mucosal melanoma (SNMM) is a melanocyte-originated tumor that currently has limited treatment options. This study found that Crizotinib may be a potential choice to improve the overall survival and quality of life of SNMM patients.
FRONTIERS IN ONCOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Wanying Li, Yimeng Guo, Zhaoping Luo, Shuhao Wu, Bo Han, Weijin Hu, Lu You, Kenji Watanabe, Takashi Taniguchi, Thomas Alava, Jiezhi Chen, Peng Gao, Xiuyan Li, Zhongming Wei, Lin-Wang Wang, Yue-Yang Liu, Chengxin Zhao, Xuepeng Zhan, Zheng Vitto Han, Hanwen Wang
Summary: This study successfully demonstrated a gate-programmable non-volatile memory by vertically assembling graphite, CuInP2S6, and MoS2 layers into a metal-ferroelectric-semiconductor (M-FE-S) architecture. The resulting devices integrate the functionalities of both ferroelectric memristor (FE-memristor) and metal-oxide-semiconductor field-effect transistor (MOS-FET), enabling gate-tunable giant electroresistance with multi-level ON-states in the FE-memristor. First-principles calculations revealed that this behavior originates from the specific band alignment at the FE-S interface. These findings pave the way for engineering ferroelectricity-mediated memories in future implementations of 2D nanoelectronics.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Prajwal Adiga, Le Wang, Cindy Wong, Bethany E. Matthews, Mark E. Bowden, Steven R. Spurgeon, George E. Sterbinsky, Monika Blum, Min-Ju Choi, Jinhui Tao, Tiffany C. Kaspar, Scott A. Chambers, Kelsey A. Stoerzinger, Yingge Du
Summary: Water electrolysis can produce green hydrogen using renewable electricity. The activity of the oxygen evolution reaction (OER) catalyst is crucial for improving electrolyzer efficiency. Earth-abundant perovskite oxides show great potential in enhancing OER activity through compositional substitution. However, the relationship between bulk composition and surface composition, where OER occurs, is still unclear.
Article
Chemistry, Physical
Chuanshou Wang, Lu You, David Cobden, Junling Wang
Summary: Research on two-dimensional van der Waals ferroelectrics has experienced significant progress in recent years. This Perspective presents a framework for analysis, provides a review of recent advances, discusses mechanisms and properties for potential applications, and outlines the challenges that need to be addressed. The discovery of ferroelectricity in two-dimensional van der Waals materials has introduced important functionalities to the family of 2D materials, which could revolutionize next-generation nanoelectronics and spintronics. This Perspective briefly reviews recent progress in the field of 2D van der Waals ferroelectrics, focusing on the mechanisms driving spontaneous polarization, unique properties arising from reduced lattice dimensionality, and promising applications. The article concludes with an outlook on challenges and possible future research directions.
Article
Chemistry, Multidisciplinary
Sandra D. D. Taylor, Kayla H. H. Yano, Michel Sassi, Bethany E. E. Matthews, Elizabeth J. J. Kautz, Sten V. V. Lambeets, Sydney Neuman, Daniel K. K. Schreiber, Le Wang, Yingge Du, Steven R. Spurgeon
Summary: Perovskite structured transition metal oxides are important for catalysis and fuel cell applications. This work investigates oxygen diffusion and transport pathways in these materials using isotopic tracers and atom probe tomography. The results provide insights into the coupling of defects and oxygen transport in this class of materials.
ADVANCED MATERIALS INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Lu You, Amr Abdelsamie, Yang Zhou, Lei Chang, Zhi Shiuh Lim, Junling Wang
Summary: The ferroelectric photovoltaic effect in BiFeO3-based vertical heterostructures is studied comprehensively to investigate its origin. It is found that the polarization-modulated Schottky barrier at the interface dominates the photovoltaic behavior under white light illumination. The selective interface contribution in different polarization states is observed, indicating the absence of bulk photovoltaic effect in vertical heterostructures under white light illumination.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Physics, Applied
Wei Yuan, Yilei Lu, Liangjun Lu, Rui Wang, Yuyan Weng, Lu You, Liang Fang, Linjie Zhou, Fengang Zheng
Summary: As a recently studied phase change material, Ge2Sb2Se4Te1 (GSST) has shown promising potential in optical devices due to its low loss in the amorphous state at the optical communication wavelength of 1550 nm and significant differences in optical properties before and after phase change. However, achieving phase change switching in real GSST devices using narrow voltage pulses remains challenging.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Applied
Jinshuo Xue, Shun Wang, Ju Zhou, Qiankun Li, Ziwen Zhou, Qiang Hui, Yiqi Hu, Zhou Zhou, Zhijian Feng, Qingyu Yan, Yiqing Yu, Yuyan Weng, Rujun Tang, Xiaodong Su, Yu Xin, Fengang Zheng, Sheng Ju, Lu You, Liang Fang
Summary: Recent success has reignited research interest in exfoliating violet or Hittorf's phosphorus to monolayer for improved electronic and optoelectronic functionalities. However, the poor air stability of black phosphorus also affects violet phosphorus. In this study, concerted spectroscopic techniques reveal the role of oxygen and water in the degradation mechanism of violet phosphorus, leading to the development of an oxide encapsulation passivation approach for air-stable violet phosphorus photodetector device. The fabricated photodetector demonstrates superior performance with ultralow dark current, high responsivity, fast response time, and excellent chemical robustness.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
Mengru Li, Haoran Sun, Yongqi Ruan, Chuan Cao, Peng Zhou, Yajun Qi, Tianjin Zhang
Summary: The photovoltaic effect and self-powered ultraviolet photodetection properties were studied in the Pt/Bi3.15Nd0.85Ti3O12 (BNT)/Pt heterostructure. The BNT films exhibited obvious photovoltaic characteristics with an open-circuit voltage of 0.67 +/- 0.04 V and a short-circuit current density of 2.27 +/- 0.08 mu A/ cm2 at a wavelength of 365 nm and a power of 77.50 mW/cm2. The self-powered ultraviolet photodetector showed a responsivity of 0.047 +/- 0.003 mA/W and a detection rate of (1.47 +/- 0.04) x 109 Jones. The reversed photocurrent response mechanism was explained based on the internal electric field for the separation and transport of photo-excited electron-hole pairs in the Pt/BNT/Pt heterostructure. The dependence of JSC on the polarization direction demonstrated the electrical manipulation nature of BNT-based self-powered photodetectors, offering a new approach for the design of photodetectors using ferroelectric oxides.
APPLIED SURFACE SCIENCE
(2023)
Review
Chemistry, Physical
Min-Ju Choi, Le Wang, Kelsey A. Stoerzinger, Sung-Yoon Chung, Scott A. Chambers, Yingge Du
Summary: The oxygen evolution reaction (OER) is a crucial step in water splitting to produce hydrogen gas. Recently, perovskite oxides, particularly rare-earth nickelates, have been extensively studied as efficient and stable OER electrocatalysts. The epitaxial synthesis of thin films allows precise control over their atomic structures and electronic properties, enabling researchers to explore different design strategies and understand their impact on the electrochemical performance.
ADVANCED ENERGY MATERIALS
(2023)
Article
Physics, Applied
Qiankun Li, Shun Wang, Jinshuo Xue, Ziwen Zhou, Yiqi Hu, Zhou Zhou, Zhijian Feng, Qingyu Yan, Yiqing Yu, Yuyan Weng, Rujun Tang, Xiaodong Su, Fengang Zheng, Liang Fang, Lu You
Summary: Metal thio(seleno)phosphates are a class of layered compounds with diverse physical properties and potential applications. In this study, the electronic transport characteristics of a quaternary selenophosphate, AgBiP2Se6, were actively manipulated by accumulating or removing mobile Ag+ ions at the metal-semiconductor interface. This manipulation effectively modulated the Schottky barrier and produced switchable diode-like behavior. Furthermore, the superior photoelectric response of AgBiP2Se6 allowed for the incorporation of induced rectifying transport.
PHYSICAL REVIEW APPLIED
(2023)
Article
Materials Science, Ceramics
Chuan Cao, Peng Zhou, Jianqiao Wang, Daohong Chen, Chuanwei Huang, Yajun Qi, Tianjin Zhang
Summary: Nonhazardous and self-powered flexible pressure sensors based on piezoelectric effect have great potential in health monitoring, human-machine interfaces, soft robots, etc. Lead-free self-powered flexible pressure sensors with coaxial nanofiber structure were developed using Nb2CTx doped poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] and BaTiO3 (BTO) doped P(VDF-TrFE) as the core and shell, respectively. These sensors exhibited impressive piezoelectric output of -28V and -8.2μA under repeated mechanical force, with an ultrafast response time of 215μs and a good linear relation between voltage and pressure. An interfacial polarization model based on the coaxial nanofibers was proposed to explain the enhanced piezoelectric output. The sensors also demonstrated sensitivity to various human motions, making them suitable for movement monitoring.
CERAMICS INTERNATIONAL
(2023)
Article
Instruments & Instrumentation
Kun Liang, Zhiqiang Chen, Shuai Yao, Haibin Tan, Peng Zhou, Zhijun Ma, Yajun Qi, Tianjin Zhang
Summary: A flexible magnetic detector based on a ferroelectric/ferromagnetic thin film heterostructure has been developed using etching and transferring technique. The detector exhibits high sensitivity and stability for magnetic field detection, presenting a viable method for future applications.
SMART MATERIALS AND STRUCTURES
(2023)
Article
Multidisciplinary Sciences
Xiaodong Yao, Yinxin Bai, Cheng Jin, Xinyu Zhang, Qunfei Zheng, Zedong Xu, Lang Chen, Shanmin Wang, Ying Liu, Junling Wang, Jinlong Zhu
Summary: The authors of this study found that CuInP2S6 exhibits an anomalous enhancement of spontaneous polarization under hydrostatic pressure. This is in contrast to the typical pressure-induced suppression of ferroelectricity. The increase in polarization is attributed to the spatial instability of Cu cations and the increase of Cu occupancy at the interlayer site. These findings provide valuable insights into the behavior of this van der Waals material and suggest new avenues for improving its properties.
NATURE COMMUNICATIONS
(2023)
