Article
Physics, Condensed Matter
Yongqi Yan, Fangchao Liu, Jialin Wu, Zhixu Zhang, Zhongchen Wu, Wei-Yan Cong, Chengbo Guan, Ying-Bo Lu
Summary: TlPbI3 is a new three-dimensional layered halide perovskite with special optoelectronic properties. Simulations showed that the Tl ion orbitals significantly contribute to the bonding interactions. The lattice contraction of TlPbI3 at low temperature leads to reinforced bonding interactions and enhanced dispersion of band edges, resulting in modulated physical performance.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Biochemistry & Molecular Biology
Alfonso Ferretti, Laura Canal, Robert A. Sorodoc, Sourab Sinha, Giuseppe Brancato
Summary: Dispersion-inclusive density functional theory (DFT) methods have shown improved performances compared to standard DFT approximations for modeling large molecular systems, although disagreements with reference calculations still exist. Applying general-purpose corrections, such as Grimme's DFT-D models, can lead to inconsistent results, recommending careful evaluation. In this study, a simple optimization protocol is proposed to enhance the accuracy of DFT-D methods for modeling water clusters, achieving remarkable agreement with accurate MC intermolecular interactions.
Article
Materials Science, Multidisciplinary
Akbar Ali, H. I. Elsaeedy, Izaz Ul Haq, Imad Khan
Summary: This study investigates the potential of polar corundum double oxides Mn2ScMO6 (M = Nb, Ta) for magnetic, ferroelectric, and magneto-electric applications. The compounds exhibit large values of polarization and magnetic moments, making them suitable candidates for future electronic devices. Additionally, they possess high stability and resistance to deformation in rhombohedral crystal symmetry.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Chemistry, Multidisciplinary
Anil Kanwat, Biplab Ghosh, Si En Ng, Prem J. S. Rana, Yulia Lekina, Thomas J. N. Hooper, Natalia Yantara, Mikhail Kovalev, Bhumika Chaudhary, Priyanka Kajal, Benny Febriansyah, Qi Ying Tan, Maciej Klein, Ze Xiang Shen, Joel W. Ager, Subodh G. Mhaisalkar, Nripan Mathews
Summary: This study investigates the optoelectronic properties and chromism of halide perovskite materials and demonstrates the control of chromism and photochromism through crystal structure transformation and modulation of intermediate n phase. These findings offer new possibilities for optoelectronics, information display, and smart window applications.
Article
Materials Science, Multidisciplinary
J. Kaczkowski, M. Pugaczowa-Michalska, I. Plowas-Korus
Summary: In this study, the formation mechanism of B-site cation ordering in double perovskite compounds was investigated using density functional theory. It was found that the ionic radius may play a major role in the non-magnetic Bi-based double perovskites, while the interactions between Fe cations may stabilize the ordering in the magnetic Bi2MFeO6.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2022)
Article
Physics, Condensed Matter
Mrinal K. Adak, Debasis Dhak
Summary: The chemically synthesized SCoBNT and SNiBNT ceramics exhibited good fermelectric properties and high energy storage efficiency, with stable characteristics at high temperatures and fatigue-free nature.
PHYSICA B-CONDENSED MATTER
(2021)
Article
Chemistry, Multidisciplinary
Na Wang, Ning Ding, Ze-Jiang Xu, Wang Luo, Hua-Kai Li, Chao Shi, Heng-Yun Ye, Shuai Dong, Le-Ping Miao
Summary: This study develops a strategy to enhance the polarization of 2D hybrid perovskite materials by halogen substitution. It is found that the material with benzylammonium substitution exhibits a large spontaneous polarization, providing a convenient and efficient method to promote the ferroelectric property of hybrid perovskite materials.
Review
Chemistry, Multidisciplinary
Eunji Sim, Suhwan Song, Stefan Vuckovic, Kieron Burke
Summary: Density functional theory (DFT) has been widely used in the fields of chemistry and materials science, providing useful accuracy by approximating the unknown exchange-correlation energy. Density-corrected DFT studies the relative contributions to total energy error and can significantly improve performance in certain cases.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Yunpeng Yao, Yu Peng, Lina Li, Xinyuan Zhang, Xitao Liu, Maochun Hong, Junhua Luo
Summary: A fatigue-free layered hybrid perovskite ferroelectric BCPB has been developed through a functional unit-transmutation strategy, demonstrating stable spontaneous polarization and high Curie temperature, as well as impressive bulk photovoltaic effect properties. This unique structure with self-regulated net electrical charged layers gives rise to the fatigue-free feature of P-s and BPVE, promoting potential applications in photovoltaic non-volatile memories. This work offers an efficient approach for exploring fatigue-free semiconducting ferroelectrics and their further applications in next-generation electronic devices.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Physical
Alastair J. A. Price, Kyle R. Bryenton, Erin R. Johnson
Summary: In this study, the authors discuss the optimal requirements for the base functional and dispersion correction to accurately account for non-bonded repulsion and dispersion attraction. They emphasize the importance of having a dispersionless, numerically stable base functional with minimal delocalization error, as well as a dispersion correction that includes finite damping, higher-order pairwise dispersion terms, and electronic many-body effects. These criteria are crucial for avoiding error cancellation and obtaining correct results based on accurate physics principles.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Liwei Tang, Wen Weng, Huaixi Chen, Lina Hua, Wuqian Guo, Yi Liu, Yu Ma, Yaoyao Chen, Junhua Luo, Zhihua Sun
Summary: The photoexcited pyroelectricity in ferroelectrics allows the direct conversion of light radiation into electric signal without external power source, promoting optoelectronic device performances. A new 2D perovskite-type ferroelectric, (BBA)2(EA)2Pb3Br10, exhibits broadband light-induced pyroelectric effects in the UV-to-IR region, enabling self-powered photodetection. This novel ferroelectric material surpasses oxide ferroelectrics in terms of sensitivity, responsivity, and detectivity.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Physics, Applied
Jinhai Huang, Ge-Qi Mao, Kan-Hao Xue, Shengxin Yang, Fan Ye, Huajun Sun, Xiangshui Miao
Summary: HfO2-based dielectrics, especially Hf(1-x)ZrxO(2) (HZO), show promise for nanoscale ferroelectric applications. However, the influence of Zr content on the electronic band structure of HZO and the comparison of bandgaps between HfO2/ZrO2 superlattices and HZO solid-state solutions are uncertain. This study systematically investigates the electronic structures of HfO2, ZrO2, and HZO, reveals the variation of HZO bandgap with respect to x, and provides comprehensive analysis on the bandgaps of HfO2/ZrO2 ferroelectric superlattices.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Nanoscience & Nanotechnology
Peng Wang, Xusheng Wang, Guorong Li, Rui Hu, Kun Zhu, Yanxia Li, Xi Yao, Zhongbin Pan
Summary: In this study, nanocrystalline engineering is used to achieve high energy density and efficiency in capacitors made of BBPT ferroelectric thin films. The film shows excellent thermal stability and fatigue endurance. The breakdown strength and polarization of the nanocrystalline engineering are controlled by the heat-treatment temperature. The enhanced breakdown strength and polarization are verified through theoretical simulations and experimental results.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Biochemistry & Molecular Biology
Divya Srivastava, Jouni Ahopelto, Antti J. Karttunen
Summary: The phonon properties and thermodynamics of four crystalline cellulose allomorphs have been investigated using dispersion-corrected density functional theory. The results show that the free energy differences between the cellulose allomorphs are small and the specific heat behavior is similar within the studied temperature range.
Article
Energy & Fuels
Othman Hakami
Summary: The optical, electronic, and thermoelectric properties of vacancy-ordered double perovskites A(2)ZrI(6) (A = Ga, In, Tl) were systematically investigated. The materials exhibit good structural and thermal stabilities, suitable energy band gaps for solar cell applications, and strong absorption in the visible and ultraviolet regions. Furthermore, they show significant advantages for thermoelectric applications.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Nanoscience & Nanotechnology
Chaochen Wang, Fan Ye, Jianhua Shen, Kan-Hao Xue, Yihua Zhu, Chunzhong Li
Summary: In this study, it was found that in situ electrochemical reduction modulates the oxidation state of copper, facilitating the formation of Cu2O on the copper surface and significantly improving the yield of ammonia in nitrate reduction. Techniques such as ion beam sputtering and operando Raman spectroscopy were used to reveal the multilayer structure of the material and the reduction process of surface oxide species. This research is of great significance for gaining a deeper understanding of the reaction mechanism of NO3RR.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Engineering, Electrical & Electronic
Sheng-Guang Ren, Run Ni, Xiao-Di Huang, Yi Li, Kan-Hao Xue, Xiang-Shui Miao
Summary: The study demonstrates the fabrication of self-rectifying memristors with high rectification ratio and nonlinearity. The high resistance leads to low power consumption, while exceptional nonlinearity and extremely low leakage current enable significant passive array scalability.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Multidisciplinary Sciences
Yan Cheng, Zhaomeng Gao, Kun Hee Ye, Hyeon Woo Park, Yonghui Zheng, Yunzhe Zheng, Jianfeng Gao, Min Hyuk Park, Jung-Hae Choi, Kan-Hao Xue, Cheol Seong Hwang, Hangbing Lyu
Summary: Atomic-resolution Cs-corrected scanning transmission electron microscopy revealed local shifting of two oxygen positions within the unit cells of a ferroelectric thin film. Reversible transition between polar and antipolar phases was induced by applying appropriate voltages. Fatigue and rejuvenation phenomena were observed.
NATURE COMMUNICATIONS
(2022)
Article
Nanoscience & Nanotechnology
Na Bai, Kan-Hao Xue, Jinhai Huang, Jun-Hui Yuan, Wenlin Wang, Ge-Qi Mao, Lanqing Zou, Shengxin Yang, Hong Lu, Huajun Sun, Xiangshui Miao
Summary: In this paper, a unidirectional annealing method is proposed for the crystallization of HZO superlattice ferroelectrics, which can eliminate the wake-up phenomenon. By heating from the Pt/ZrO2 interface side, 600°C annealing can achieve wake-up free and switchable ferroelectric devices. However, heating from the TiN/HfO2 side or using 500°C annealing requires a wake-up process.
ADVANCED ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Physical
Jun-Hui Yuan, Ge-Qi Mao, Kan-Hao Xue, Na Bai, Chengxu Wang, Yan Cheng, Hangbing Lyu, Huajun Sun, Xingsheng Wang, Xiangshui Miao
Summary: Ferroelectricity in thin-film HfO2 and ZrO2 is attributed to the 7 cation coordination number, which is influenced by the proper ionic radii of Hf/Zr compared with O. The 8-coordination tetragonal intermediate phase plays a significant role in reducing the switching barrier, leading to ferroelectric distortion.
CHEMISTRY OF MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Hua-Nan Liang, Na Bai, Lan-Qing Zou, Hua-Jun Sun, Kan-Hao Xue, Wei-Ming Cheng, Hong Lu, Xiang-Shui Miao
Summary: In this study, the insertion of a GeTe layer in HfOx-based memristors improved the forming yield, memory window, and resistive switching uniformity. The resistive switching characteristics were studied using two forming polarities, positive forming and negative forming, resulting in unstable and volatile behavior related to ovonic threshold switching and the observation of negative differential resistance phenomenon.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Multidisciplinary Sciences
Fan Ye, Kan-Hao Xue, Heng Yu, Shengxin Yang, Jun-Hui Yuan, Rongchuan Gu, Ming Xu, Xiangshui Miao
Summary: This study systematically investigates the impact of different dopants on the tuning of Schottky barriers in rutile TiO2-based capacitors, and finds that yttrium doping is the most effective in reducing the leakage current problem.
ADVANCED THEORY AND SIMULATIONS
(2023)
Article
Physics, Applied
Jinhai Huang, Ge-Qi Mao, Kan-Hao Xue, Shengxin Yang, Fan Ye, Huajun Sun, Xiangshui Miao
Summary: HfO2-based dielectrics, especially Hf(1-x)ZrxO(2) (HZO), show promise for nanoscale ferroelectric applications. However, the influence of Zr content on the electronic band structure of HZO and the comparison of bandgaps between HfO2/ZrO2 superlattices and HZO solid-state solutions are uncertain. This study systematically investigates the electronic structures of HfO2, ZrO2, and HZO, reveals the variation of HZO bandgap with respect to x, and provides comprehensive analysis on the bandgaps of HfO2/ZrO2 ferroelectric superlattices.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Physical
Hanli Cui, Shengxin Yang, Kan-Hao Xue, Jinhai Huang, Xiangshui Miao
Summary: Density functional theory (DFT)-1/2 is an efficient method for rectifying the bandgap in DFT calculations under local density approximation (LDA) or generalized gradient approximation. The self-consistency of DFT-1/2 calculations is found to be necessary for insulators or semiconductors with different types of bonding, including ionic bonds and covalent bonds. However, there is currently no quantitative criterion for determining which implementation should be used for a given insulator, leading to ambiguity in this method.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Multidisciplinary Sciences
Xinyu Huang, Luman Zhang, Lei Tong, Zheng Li, Zhuiri Peng, Runfeng Lin, Wenhao Shi, Kan-Hao Xue, Hongwei Dai, Hui Cheng, Danilo de Camargo Branco, Jianbin Xu, Junbo Han, Gary J. J. Cheng, Xiangshui Miao, Lei Ye
Summary: The exchange bias effect is enhanced by pressure tuning in a van der Waals heterostructure, leading to improved sensitivity and stability, and demonstrating a highly efficient spin valve. These findings provide opportunities for future customization of 2D spintronic devices.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Tong Jin, Zheng Liu, Jiajun Luo, Jun-Hui Yuan, Hanqi Wang, Zuoxiang Xie, Weicheng Pan, Haodi Wu, Kan-Hao Xue, Linyue Liu, Zhanli Hu, Zhiping Zheng, Jiang Tang, Guangda Niu
Summary: Efficient light extraction in perovskite X/gamma-ray scintillators is hindered by the small Stokes shift of exciton luminescence. Here, Jin et al. exploit the intrinsic strain in 2D perovskite as self-wavelength shifting to reduce the self-absorption effect without sacrificing the device response speed.
NATURE COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Jun-Hui Yuan, Yun-Lai Zhu, Wen-Yu Fang, Sheng-Xin Yang, Kan-Hao Xue, Na Bai, Lei Ye, Xiaomin Cheng, Xiangshui Miao
Summary: We have predicted eight kinds of stable two-dimensional materials (AMgB: A = Na, K; B = P, As, Sb, Bi) for solar energy harvesting using first-principles calculations. The AMgB monolayers show a wide range of band gaps from 0.39 to 1.68 eV with direct or quasi-direct band features. They also exhibit high acoustic phonon-limited carrier mobilities ranging from 10(3) to 10(7) cm(2)V(-1) s(-1). Additionally, the AMgB monolayers show significant optical absorption in the visible to ultraviolet range, with power conversion efficiencies (PCEs) of up to 22.06% for NaMgAs/NaMgSb and 16.26% for KMgP/KMgAs heterojunctions.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Ge-Qi Mao, Jun-Hui Yuan, Kan-Hao Xue, Jinhai Huang, Shengxin Yang, Xiangshui Miao
Summary: In recent years, hafnia-based ferroelectrics have attracted significant attention for their ability to maintain ferroelectricity below 10 nm thickness and compatibility with microelectronics flow lines. However, the physical origin of their ferroelectricity is still unclear, although it is commonly attributed to a polar Pca2(1) orthorhombic phase. This study explores new materials with potential ferroelectricity due to the polar Pca2(1) phase and recommends LuOF as a promising candidate for further experimental synthesis and investigation.
JOURNAL OF PHYSICS-MATERIALS
(2023)
Article
Chemistry, Physical
Pu Ai, Fengjun Yan, Wen Dong, Shi Liu, Junlei Zhao, Kan-Hao Xue, Syed Ul Hasnain Bakhtiar, Yilong Liu, Qi Ma, Ling Miao, Mengyuan Hua, Guangzu Zhang, Shenglin Jiang, Wei Luo, Qiuyun Fu
Summary: The scale-free ferroelectric polarization of fluorite MO2 (M = Hf, Zr) due to flat polar phonon bands shows potential for nonvolatile memories. Point defects can significantly flatten the polar phonon bands in La-doped MO2 (M = Hf, Zr), but a balance between V-O and local lattice distortion is needed for high-performance fluorite ferroelectricity. This work bridges the relationship between point defects and the overall enhanced ferroelectricity in fluorite ferroelectrics at the atomic level and provides inspiration for further defect-engineering property optimization.
NPJ COMPUTATIONAL MATERIALS
(2023)
Article
Chemistry, Inorganic & Nuclear
Yiqin Gong, Fan Ye, Qiliang Zhu, Wei Yan, Jianhua Shen, Kan-Hao Xue, Yihua Zhu, Chunzhong Li
Summary: This work improves the instability issue of lead halide perovskite CsPbBr3 quantum dots (QDs) through surficial molecular modification and multi-dimensional structure design, resulting in enhanced photocatalytic performance. The addition of 2-phenylethanamine bromide as a ligand compensates for surface bromide vacancy defects and forms 2D and quasi-2D perovskite nanosheets. These nanosheets improve the stability and trigger phase transition and heterojunction formation, leading to improved photocatalytic performance.
DALTON TRANSACTIONS
(2022)