Article
Physics, Multidisciplinary
Ruiling Gao, Chao Liu, Le Fang, Bixia Yao, Wei Wu, Qiling Xiao, Shunbo Hu, Yu Liu, Heng Gao, Shixun Cao, Guangsheng Song, Xiangjian Meng, Xiaoshuang Chen, Wei Ren
Summary: In this study, the possibility of producing a spin-polarized two-dimensional electron gas (2DEG) in the heterojunction composed of MoSi2N4 and VSi2N4 was explored using first-principles calculations. The electronic structures of the heterojunction were effectively tuned by lattice strain and electric fields, leading to metal-to-semiconductor transition and band gap opening. Additionally, the properties of lateral heterojunctions with different edge shapes were investigated.
CHINESE PHYSICS LETTERS
(2022)
Article
Thermodynamics
Shenglong Zhang, Shilei Yi, Jia-Yue Yang, Jian Liu, Linhua Liu
Summary: This study reveals a positive correlation between the spontaneous polarization and thermal conductivity in ferroelectric HfO2, indicating that an increased spontaneous polarization leads to an enhanced thermal conductivity. This correlation is likely due to the lattice anharmonicity, and it may be a universal feature in other ferroelectric materials. The findings pave the way for establishing the structure-property relation in ferroelectric HfO2 and offer novel avenues for the design and application of ferroelectric materials.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Optics
A. V. Viatkina, V. A. Yerokhin, A. Surzhykov
Summary: In this study, many-body perturbation theory is used to calculate the isotope shifts of energy levels in Ca+ for even isotopes. The results show that the second-order mass shift and nuclear polarization correction are the dominant sources of King-plot nonlinearity for specific transitions.
Article
Multidisciplinary Sciences
Alex M. Ganose, Junsoo Park, Alireza Faghaninia, Rachel Woods-Robinson, Kristin A. Persson, Anubhav Jain
Summary: The authors developed a computationally efficient method for calculating carrier scattering rates of semiconductors, which shows similar accuracy to state-of-the-art methods but at a much lower computational cost. This approach enables high-throughput computational workflows for accurate screening of carrier mobilities, lifetimes, and thermoelectric power.
NATURE COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Jiashu Chen, Ming Tao, Jing Xiao, Mengchao Shi, Junhua Li, Xi Ding, Bowen Huang, Jie Liu
Summary: In this study, the p-type dopant element in c-BN was comprehensively screened and analyzed using first-principles calculation. It was found that lithium (Li) is a good candidate p-type dopant for c-BN based on its acceptor level creation and lower formation energy under N-rich condition. Additionally, the compensating effect of unintentionally doped interstitial impurities caused by small atomic radius (Li-i and Be-i) was also investigated.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Ziwen Wang, Yisheng Chai, Shuai Dong
Summary: The concept of topology has been widely applied to condensed matter, and recent breakthroughs have revealed unconventional topological physics in a quadruple perovskite TbMn3Cr4O12. Using density functional theory calculations, the existence of a Roman surface trajectory of magnetism-induced polarization in this material is confirmed. An alternative material is proposed to enhance performance by promoting easily detectable magnetism-induced polarization.
Article
Nanoscience & Nanotechnology
Fabi Zhang, Xu Liu, Juan Zhou, Qing Liao, Tangyou Sun, Xingpeng Liu, Ying Peng, Daoyou Guo, Peng Wang, Haiou Li
Summary: The crystal structure, band structure, density of states, and optical properties of kappa-(Ga1-xInx)(2)O-3 (x = 0, 0.125, 0.25, 0.5) were studied using first-principles calculation based on density functional theory. The bandgap of kappa-(Ga1-xInx)(2)O-3 decreases and the light absorption coefficient increases as the In content increases. The qualitative calculation with the Born effective charge suggests that kappa-(Ga1-xInx)(2)O-3 exhibits spontaneous polarization properties, with an increase in polarization along the extended c-axis with increasing In content.
Article
Chemistry, Physical
Yagmur Aksu Korkmaz, Ceyhun Bulutay, Cem Sevik
Summary: Semiconductor monolayer transition metal dichalcogenides (TMDs) introduce optically addressable valley degree of freedom, linking optics to mechanics. Research shows that while expected novel features did not emerge, electronic band structures of these TMDs do vary under different strains.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Engineering, Electrical & Electronic
Kenji Hirata, Shoya Kawano, Hiroshi Yamada, Masato Uehara, Sri Ayu Anggraini, Morito Akiyama
Summary: This study investigated the spontaneous polarization of ytterbium-doped aluminum nitride and its correlation with the lattice-constant ratio of the wurtzite structure. The results suggest that YbAlN is a promising barrier layer for GaN-based high-electron-mobility transistors.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
Article
Physics, Condensed Matter
Qian Chen, Ruizhi Zhang, Jie Xu, Shuyao Cao, Yiting Guo, Jie Kong, Feng Gao
Summary: The polarizability and spontaneous polarization of high-valent cations doped KSr2Nb5O15 lead-free tetragonal tungsten bronze ferroelectrics are calculated using first principles and experimental results. The results show good agreement between calculated polarizability based on dielectric constants and experimental values, especially for trivalent cation doping structures. The reliability of prediction is confirmed by the consistency between spontaneous polarization calculated using first principles and experimental results.
PHYSICA B-CONDENSED MATTER
(2021)
Article
Chemistry, Multidisciplinary
Daniel S. P. Tanner, Eric Bousquet, Pierre-Eymeric Janolin
Summary: A new method for calculating the electrostrictive properties of materials using density functional theory is proposed in this work. It demonstrates significant advantages of efficiency, robustness, and ease of use compared to current finite-field methodologies for electrostriction calculation. This allows for high throughput theoretical investigation into the electrostrictive properties and microscopic origins of giant electrostriction in materials.
Article
Chemistry, Multidisciplinary
Petra Stanic, Ivana Niksic-Franjic, Luka Pavic, Kresimir Molcanov
Summary: Five charge transfer complexes of electron donor N,N,N',N'-tetramethyl-p-phenylenediamine with quinoid electron acceptors were prepared and studied. X-ray crystallography, impedance spectroscopy, and DFT computations were employed in the investigation. Mixed donor-acceptor pi-stacks were observed in all compounds. All moieties had a partial radical character due to charge transfer.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Physics, Applied
Xiaoqing Yang, Tianhao Su, Minglang Hu, Yongchang Li, Heng Gao, Fanhao Jia, Le Fang, Yangyang Chen, Bin Zhou, Haijun Su, L. Bellaiche, Wei Ren
Summary: Rare earth nitride (REN) superlattices, with magnetic REN as one of the parent components, are found to be stable with (anti-)ferromagnetic and ferroelectric orderings. Volume matching condition is applicable to these superlattices, resulting in a large piezoelectric response. In-plane biaxial strain can control the electronic bandgap. The unpaired magnetically active 4f-electrons reduce the distortion of the wurtzite structure, enabling the switching of ferroelectric polarization.
APPLIED PHYSICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Youngho Kang
Summary: We investigated the effects of epitaxial strain on the ferroelectric properties of BiAlO3 (BAO) and found that the polarization of BAO is insensitive to epitaxial strain. The weak sensitivity of polarization is attributed to the stereochemical activity of Bi 6s(2) lone pairs and the inertness of Al to polarization. The strain application also modifies the switching energy barrier by up to 30%.
CURRENT APPLIED PHYSICS
(2022)
Article
Physics, Applied
Koga Furuta, Kenji Hirata, Sri Ayu Anggraini, Morito Akiyama, Masato Uehara, Hiroshi Yamada
Summary: This study systematically investigates the effect of scandium concentration on spontaneous polarization in ScxAl1-xN using first-principles calculations. It is found that a structural transition from a c-axis polarized wurtzite structure to a nonpolarized layered hexagonal structure occurs at x = 0.67, leading to a nonlinear decrease in spontaneous polarization. Additionally, the comparison of spontaneous polarizations from different cations reveals a higher value for aluminum-nitrogen (Al-N) compared to scandium-nitrogen (Sc-N) due to differences in internal parameters along the c axis in the layered hexagonal structure.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Applied
L. Y. Li, K. Shima, M. Yamanaka, K. Kojima, T. Egawa, A. Uedono, S. Ishibashi, T. Takeuchi, M. Miyoshi, S. F. Chichibu
Summary: A record-long room-temperature photoluminescence lifetime was achieved for a sub-bandgap emission band of AlInN epilayer, suitable for use in cladding layers of edge laser structures. The experiment indicated a relatively low concentration of nonradiative recombination centers in the epilayer, with zero carrier diffusion observed in spatially resolved cathodoluminescence intensity images.
APPLIED PHYSICS LETTERS
(2021)
Review
Chemistry, Multidisciplinary
Akiko Kobayashi, Biao Zhou, Rina Takagi, Kazuya Miyagawa, Shoji Ishibashi, Akito Kobayashi, Taiki Kawamura, Eiji Nishibori, Kazushi Kanoda
Summary: Traditional molecular conductors are typically composed of more than two chemical species, but recent advancements have led to the development of single-component molecular conductors. These single-component molecular conductors have shown unique electronic properties and unusual phenomena, especially in systems with multi-orbital correlated pi or pi-d electron systems. In addition, the discovery of the first single-component molecular superconductor [Ni(hfdt)(2)] and the development of new molecular Dirac electron systems have opened up exciting possibilities for further research in this field.
BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN
(2021)
Article
Crystallography
Akira Uedono, Junichi Takino, Tomoaki Sumi, Yoshio Okayama, Masayuki Imanishi, Shoji Ishibashi, Yusuke Mori
Summary: Defects in bulk GaN grown by the oxide vapor phase epitaxy method were investigated using positron annihilation spectroscopy. The study revealed that the major defect species in OVPE-GaN were Ga vacancy-type defects coupled with oxygen atoms, attributed to the high oxygen concentration during growth. A correlation between defect complexes and sample transparencies was observed. Additionally, an epitaxial film grown on OVPE-GaN was found to have a low vacancy concentration, indicating that epitaxial layers can be grown without being influenced by vacancies in the substrates.
JOURNAL OF CRYSTAL GROWTH
(2021)
Article
Materials Science, Multidisciplinary
Shoji Ishibashi, Sachio Horiuchi, Reiji Kumai
Summary: In this study, van der Waals density-functional theory (vdW-DFT) calculations are used to predict crystal structure parameters and spontaneous polarization values for seven hydrogen-bonded single-component organic ferroelectrics. The results show good agreement with experimental results, indicating significant progress in computational materials design of organic ferroelectrics. This approach also enables simulation of electromechanical responses, with acceptable agreement with experimental values when objective factors are considered.
PHYSICAL REVIEW MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Hyun Chung, Dae Woong Kim, Woo Jin Cho, Heung Nam Han, Yuji Ikeda, Shoji Ishibashi, Fritz Kormann, Seok Su Sohn
Summary: High- and medium-entropy alloys with high solid-solution strength have significant effects on strain-hardening rate. In this study, the role of solid-solution strengthening on strain-hardening rate was revealed by controlling the Cr/V ratio in V1-xCrxCoNi alloys and investigating the evolution of deformation structures. The results showed that under the activated huge solid-solution strengthening effect, dislocation-mediated plasticity can be predominant over twinning, leading to an overall higher strain-hardening rate in the V-rich alloys.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Physics, Condensed Matter
Akira Uedono, Hideki Sakurai, Jun Uzuhashi, Tetsuo Narita, Kacper Sierakowski, Shoji Ishibashi, Shigefusa F. Chichibu, Michal Bockowski, Jun Suda, Tadakatsu Ohkubo, Nobuyuki Ikarashi, Kazuhiro Hono, Tetsu Kachi
Summary: In this study, the annealing behaviors of defects and the diffusion characteristics of Mg in ion-implanted GaN were investigated. It was found that high concentration of Mg doping caused Mg diffusion into the bulk and reaction with vacancies, while nitrogen implantation suppressed the Mg diffusion and enhanced the donor-acceptor pair emission, which is of great significance for improving the performance of GaN materials.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2022)
Article
Physics, Applied
L. Y. Li, K. Shima, M. Yamanaka, T. Egawa, T. Takeuchi, M. Miyoshi, S. Ishibashi, A. Uedono, S. F. Chichibu
Summary: The research focused on the light emission efficiency of lattice-matched Al1-xInxN / GaN heterostructures and found that factors such as growth temperature, threading dislocation density, and surface morphology play important roles in determining the concentration of nonradiative recombination centers in the epilayers.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Akira Uedono, Naomichi Takahashi, Ryu Hasunuma, Yosuke Harashima, Yasuteru Shigeta, Zeyuan Ni, Hidefumi Matsui, Akira Notake, Atsushi Kubo, Tsuyoshi Moriya, Koji Michishio, Nagayasu Oshima, Shoji Ishibashi
Summary: In this study, TiN/ZrO2/TiN capacitors were fabricated using physical vapor deposition technique, and their micro-structures were characterized. The results showed that a defect-rich interlayer was formed in the ZrO2 layer after the deposition of a 10-nm-thick ZrO2 layer on the top TiN layer. After post-deposition annealing, the width of the interlayer expanded towards the center of the ZrO2 layer.
Article
Multidisciplinary Sciences
Shoji Ishibashi, Reiji Kumai, Sachio Horiuchi
Summary: Some organic ferroelectrics, such as DHBA and Hdabco-ReO4, have two possible switching modes: molecular reorientation and proton transfer. This study demonstrates a straightforward method to identify the ferroelectric switching mechanism by illustrating the relationship between polarization vectors and using the theoretical background for the sign of the piezoelectric coefficient. The comparison between theoretically calculated piezoelectric coefficients and experimental results confirms the switching mode of each compound.
SCIENTIFIC REPORTS
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Akira Uedono, Hideki Sakurai, Jun Uzuhashi, Tetsuo Narita, Kacper Sierakowski, Shoji Ishibashi, Shigefusa F. Chichibu, Michal Bockowski, Jun Suda, Tadakatsu Ohkubo, Nobuyuki Ikarashi, Kazuhiro Hono, Tetsu Kachi
Summary: The behaviors of vacancy-type defects in ion-implanted GaN were investigated using positron annihilation. Si or Mg ions were implanted to obtain impurity box profiles. The major defect species in as-implanted GaN was identified as Ga-vacancy-type defects, such as a divacancy (VGaVN). After annealing, vacancy clusters were introduced, and they remained even after high temperature annealing. For Mg-implanted GaN, the diffusion of Mg was observed at high doping concentrations, but it was suppressed by sequential N-implantation due to the reaction between Mg and vacancies.
GALLIUM NITRIDE MATERIALS AND DEVICES XVIII
(2023)
Article
Chemistry, Multidisciplinary
Sachio Horiuchi, Hiromi Minemawari, Shoji Ishibashi
Summary: Switchable pi-electron systems in organic molecular crystals can produce strong ferroelectric or antiferroelectric polarizations, as confirmed by density functional theory calculations. The relationship between the hydrogen bonding state and polarization switching mode can be explained through experiments and calculations, revealing rich variations. Different behaviors can be observed when switchable dipoles compete between different antipolar arrangements.
MATERIALS HORIZONS
(2023)
Correction
Materials Science, Multidisciplinary
Shoji Ishibashi, Sachio Horiuchi, Reiji Kumai
Proceedings Paper
Engineering, Manufacturing
Shigefusa F. Chichibu, Kohei Shima, Kazunobu Kojima, Shoji Ishibashi, Akira Uedono
TWENTIETH INTERNATIONAL WORKSHOP ON JUNCTION TECHNOLOGY (IWJT 2021)
(2021)
Article
Chemistry, Multidisciplinary
Sachio Horiuchi, Shoji Ishibashi
Summary: The stepwise on/off switching of large polarization in dielectric materials can be achieved by flipping antipolar or canted electric dipoles through proton transfer and inducing geometric changes in the pi-conjugation system. Various dielectric phase changes and polarization hysteresis loops were observed in different materials, with consistent results obtained through density functional theory calculations in the simplest sublattice model. The energy-storage performance of squaric acid was demonstrated to be excellent, with high recoverable energy-storage density and nearly ideal efficiency, surpassing that of bulk antiferroelectric ceramics without any modifications.
Article
Materials Science, Multidisciplinary
Sachio Horiuchi, Reiji Kumai, Shoji Ishibashi
Summary: Large polarizations and reversible switching are achieved in new single-component organic molecular ferroelectrics with rotating strongly dipolar molecules or substituents. The theoretically computed polarizations successfully reproduce experimental values, demonstrating that rotational processes can reverse most of the observed macroscopic polarizations. The large polarizations in these systems are attributed to specific molecular features such as strongly electron-withdrawing groups and highly polarized substituents.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Physics, Condensed Matter
A. Jbeli, N. Zeiri, N. Yahyaoui, P. Baser, M. Said
Summary: The electronic and optical properties of CdSe/ZnSe semiconductor core/shell quantum dots with hydrogenic donor impurity were investigated theoretically. The perturbation and variational methods were used to calculate the binding energy, photoionization cross-section, polarizability, and diamagnetic susceptibility of the excited impurity under various conditions. A significant stark shift in the binding energy was observed under the influence of an external electric field.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Rahat Batool, Tariq Mahmood, Sajid Mahmood, Abdul Aziz Bhatti
Summary: This study investigates the effects of alkali metal doping (Na, K, Cs) on MAPbI3 through compositional engineering. The results show that doping Na, K, and Cs can improve the phase stability, thermodynamic stability, and optical absorption of MAPbI3.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
N. A. N. M. Nor, M. A. H. Razali, W. H. A. W. K. Annuar, N. N. Alam, F. N. Sazman, N. H. M. Zaki, A. S. Kamisan, A. I. Kamisan, M. H. Samat, A. M. M. Ali, O. H. Hassan, B. U. Haq, M. Z. A. Yahya, M. F. M. Taib
Summary: This study investigates the potential of quaternary chalcogenides semiconductors as thin film solar cell absorbers using density functional theory (DFT) and density functional theory plus Hubbard U (DFT + U) approach. The results show that by applying Hubbard U terms, the electronic band gaps can be accurately predicted, providing valuable insights for finding cost-effective new thin film solar cell materials.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Ashwani Kumar, Anuj Kumar, Mohaseen S. Tamboli, Mohd Ubaidullah, J. Jayarubi, S. K. Tripathi
Summary: In this study, lead-based perovskite solar cells are replaced by bismuth-based perovskite cells to overcome their instability and toxicity. CsBi3I10 perovskite films are fabricated using a modified drop-casting process, and the effects of post-annealing temperature on the morphological, structural, and optical properties are investigated. The photovoltaic performance of the cells without a hole transport layer is also quantitatively evaluated.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Yang Gao, Shu-Ming Chen, Shuo Cao, Shang-Zhou Zhang, Philippe Djemia, Qing-Miao Hu
Summary: This study investigates the phase stability, elastic modulus, and hardness of ternary nitride Ti1-xAlxN. It is found that the hardness increases with the Al content x. The cubic B1 structure is more stable for x < about 0.75, while the hexagonal structure (B4) is more stable for x > about 0.75. The composition dependent hardness and phase decomposition contribute to the convex shaped hardness curve of Ti1-xAlxN.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Fengqi Wang, Qinyan Ye, Xulin He, Kun Luo, Xiaolong Ran, Xingping Zheng, Cheng Liao, Ru Li
Summary: This report uses rigorous calculations based on density functional theory to study the piezoelectric and elastic properties of wurtzite aluminum nitride (w-AlN) with single- and co-alloying by Hf (or Zr) and Sc. The research finds that the (HfSc)0.375Al0.625N and (ZrSc)0.375Al0.625N with stable wurtzite phase have a large piezoelectric coefficient d33 of 49.18 pC/N and 47.00 pC/N, respectively. However, the piezoelectric voltage constant g33 and electromechanical coupling constant k233 of HfAlN, ZrAlN, HfScAlN, and ZrScAlN are smaller than that of ScAlN, which is attributed to the large dielectric constant epsilon 33 of Hf (or Zr) alloying samples. Furthermore, the calculations of internal parameter u and bond angle alpha elucidate the brittle-to-ductile transformation in alloying w-AlN crystal structure. Electronic structure calculations show that the bandgap decreases almost linearly with the increase of alloying concentration, and the Hf (or Zr) alloying compounds become n-type semiconductors due to the existing high-charge states.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
S. R. Athul, K. Arun, S. Swathi, U. D. Remya, Andrea Dzubinska, Marian Reiffers, Nagalakshmi Ramamoorthi
Summary: The magnetic and magnetocaloric characteristics of Ho6FeSb2 have been studied. The compound exhibits two second-order ferromagnetic transitions, enabling hysteresis-free magnetocaloric effect across a wide temperature range. The alloy has high relative cooling power and magnetoresistance, making it suitable for hysteresis-free magnetocaloric applications.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Reena Sharma, Neelam Hooda, Ashima Hooda, Satish Khasa
Summary: A polycrystalline double perovskite La2CoMnO6 sample was prepared and its structural, dielectric and magnetic properties were investigated. The sample exhibited complex structures and magnetic behavior, and showed good conductivity and dielectric performance. Its multi-domain magnetic structure suggests its suitability for memory device applications.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Shubha Dubey, Jisha A. Abraham, Kumud Dubey, Vineet Sahu, Anchit Modi, G. Pagare, N. K. Gaur
Summary: This study investigates the optoelectronic, thermodynamic, thermoelectric, and mechanical stability properties of RhTiP Half Heusler semiconductors. The results show that RhTiP is a non-magnetic material with confirmed mechanical stability. It is found to be an indirect-bandgap semiconductor with a good Seebeck coefficient. This study suggests that RhTiP has promising applications in the thermoelectric and optoelectronic fields.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Xun Xie, Jiong-Ju Hao, Hong-Wei Yang
Summary: This work presents a multilayer film structure that uses optical resonance to prepare highly efficient and saturated red, green, and blue transmittance colors. Numerical simulations and analysis show that the structure can produce R, G, and B colors with a purity comparable to standard RGB colors, while maintaining efficient transmission efficiency and obtaining a rich variety of structural colors. Additionally, a metallic interlayer is introduced to selectively suppress resonances in the short-wavelength region, improving the purity of the red color. The study also investigates the effect of the incidence angle on color purity and transmission efficiency.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Yueqiang Zhao
Summary: Solubility property is of great interest in chemical, physical, pharmaceutical, material, and environmental sciences. Understanding the intrinsic reason behind solubility behavior is a fascinating task. The theoretical relation between binary mutual solubility and liquid-liquid interfacial tension has been derived, where the partitioning of solute molecules between two coexisting liquid phases is determined by the transfer free energy per unit segment for a chain-like solute molecule expressed in terms of solute-solvent interfacial tension. This general theory of solubility is in good agreement with experimental results for binary mutual solubility and molar transfer free energy of solute molecules.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Osama K. M. Bashiar, R. E. Kroon, H. C. Swart, R. A. Harris
Summary: ZnO thin films with near-infrared emission were successfully fabricated using pulsed laser deposition under vacuum conditions, without the need for additional gases or implantation methods. The NIR emission was hypothesized to be caused by defects in the ZnO film due to high energy particle impacts on the sample surface.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
O. Stognei, A. Berezutskii, I. Anisimov, A. Deryabin
Summary: The influence of ZrOn matrix stoichiometry on the electrical and magnetoresistive properties of Fe-Zr-O nanocomposites has been studied. It was found that the magnetoresistive effect is not observed in composites with oxygen lack, while composites with oxygen excess show magnetoresistive effect and increased resistivity. Magnetoresistivity in composites with oxygen lack only appears after heat treatment. These results can be explained by the difference in the density of localized states in the oxide matrix of the composites and the ratio between two types of conductivity.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
Mehmet Bayirli, Aykut Ilgaz, Orhan Zeybek
Summary: The present study aims to understand the relationship between impedance characteristics and fractal behaviors. By producing neat and carbon nanotube doped composite specimens, the researchers investigated the electrical properties and surface heteromorphology using Nyquist plots and fractal analysis.
PHYSICA B-CONDENSED MATTER
(2024)
Article
Physics, Condensed Matter
M. I. Khan, Saddam Hussain, Muhamad Saleem, Fatimah Mohammed Alzahrani, Muhammad Siddique, M. S. Hassan, Allah Ditta Khalid, Munawar Iqbal
Summary: The sol-gel method was used to deposit Ti-doped MAPbBr3 films on FTO-glass substrates with different doping ratios (0%, 4%, and 6%). XRD analysis confirmed the cubic structure of all films, and the 4% Ti-doped film exhibited a large grain size, low band gap energy, and high refractive index. Solar cells fabricated using the 4% Ti-doped MAPbBr3 film showed improved performance in terms of current density, open circuit voltage, fill factor, and efficiency.
PHYSICA B-CONDENSED MATTER
(2024)
