Article
Physics, Applied
Anqi Guo, Lichun Zhang, Ning Cao, Taiping Lu, Yadan Zhu, Zhiying Zhou, Shunli He, Bin Xia, Fengzhou Zhao
Summary: Due to its ultra-wideband gap, high transmittance in the UV region, and excellent environmental stability, zinc gallium oxide (ZnGa2O4) has gained significant interest in deep-ultraviolet photodetectors. ZnGa2O4 thin film was fabricated on different substrates using pulsed laser deposition and post-annealing under an oxygen atmosphere. The choice of substrates has a significant impact on the morphology, structure, and crystal quality of the thin film. After annealing, the thin film quality was improved. The metal-semiconductor-metal photodetector exhibited excellent reproducible characteristics and fast response performance, indicating great potential in next-generation optoelectronic devices.
APPLIED PHYSICS EXPRESS
(2023)
Article
Materials Science, Multidisciplinary
Md Dalim Mia, Brian C. Samuels, Pablo D. Borges, Luisa Scolfaro, Anwar Siddique, Jibesh Kanti Saha, Abdul Ahad Talukder, Ravi Droopad
Summary: Thin film wide bandgap Ga2O3 based alloys have important applications in various fields such as high power electronics, deep UV photonics, and spintronics. This study successfully grew epitaxial (Ga1-xGdx)(2)O-3 thin films on Al2O3 substrates with varied compositions, and the material properties could be tuned by adjusting the growth parameters. The results showed that higher growth temperatures favored the formation of the desired phase, and the incorporation of Gd into Ga2O3 caused lattice expansion and a red shift in bandgap. XPS spectroscopy confirmed the presence of Gd3+ oxidation states, and current voltage measurements demonstrated an increase in resistivity with Gd doping. These findings were further supported by density functional theory calculations.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Chemistry, Inorganic & Nuclear
Yu-Hsuan Su, Wei-Liang Chen, Hye Ryung Byun, Yu-Fu Zhang, Min-Rui Zhuang, Yu-Cih Lin, Chung-Kai Chang, Po-Yuan Wang, Che-Cheng Lin, Kuang- Lin, Hsin-Kuan Liu, Min-Kai Lee, Joon Jang, Yu-Ming Chang, Kuei-Fang Hsu
Summary: A new copper indium selenide with an orthorhombic crystal structure was synthesized at 800 degrees C. It emits intense photoluminescence at 657 nm and exhibits a direct band gap with an energy close to the photoluminescence position. The compound also shows n-type conductivity and strong nonlinear third-harmonic generation.
INORGANIC CHEMISTRY
(2023)
Article
Optics
Xi Zou, Tengfei Chang, Zhou Yan, Zi Song Zhao, Yang Pan, Wenyang Liu, Lijun Song
Summary: Components manufactured by direct laser deposition (DED) often have excessive residual stress due to rapid heating and cooling. Understanding the thermodynamic behavior during processing is important for controlling residual stress.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Liang Ma, Xiangwei Kong, Jingjing Liang, Jinguo Li, He Feng, Shiwei Ci, Xue Zhang, Cong Sun, Zhibo Jin
Summary: This study investigates the thermal behavior of molten pool in different laser deposition processes and explores the relationship between microstructure and mechanical properties. The results show that pulsed laser deposition leads to higher temperature gradient, faster cooling rate, and specific microstructures compared to continuous laser deposition. The mechanical tests demonstrate that samples from interval pulsed laser deposition exhibit higher strength and hardness, but lower ductility.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Automation & Control Systems
Zhou Yan, Lijun Song, Wenyang Liu, Xi Zou, Zhipeng Zhou
Summary: The study reveals unique melt pool shape changes and thermal stress evolution in pulsed laser additive manufacturing, with residual stress distribution showing similar zigzag heterogeneity. Excellent agreement between experimental measurements and numerical results is achieved, providing guidance for optimizing operation parameters to control or reduce residual stress.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Ekaterina A. Avilova, Evgeniia M. Khairullina, Andrey Yu Shishov, Elizaveta A. Eltysheva, Vladimir Mikhailovskii, Dmitry A. Sinev, Ilya I. Tumkin
Summary: In this study, a method for fabricating electrically conductive copper patterns and films of arbitrary topology using improved laser-induced synthesis was developed. The efficiency of the process was significantly increased through acceptor substrate pretreatment, auxiliary glass substrates, and optional laser post-processing. The potential of laser-induced periodic surface structures for tuning functional properties of the tracks was also observed.
Article
Nanoscience & Nanotechnology
Shasvat Rathod, Monika Snowdon, Joshua Jones, Kaiping Zhang, Peng Peng
Summary: In this study, a fiber laser direct writing (FLDW) process is developed for the simultaneous fabrication of diodes and bipolar junction transistors (BJTs) on flexible polyimide substrates. The fabricated diodes and BJTs demonstrate excellent performance under various operating conditions.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Nicole Bartek, Vladimir V. Shvartsman, Houssny Bouyanfif, Alexander Schmitz, Gerd Bacher, Selina Olthof, Svetlana Sirotinskaya, Niels Benson, Doru C. Lupascu
Summary: Ferroelectric materials have attracted attention for photovoltaic applications, with lead-based ferroelectric perovskite thin films and PbFe0.5Nb0.5O3 (PFN) being studied. PFN has a relatively low band gap value, which can enhance its light absorption capability, making it a promising candidate as an absorber material.
Article
Chemistry, Physical
A. Maffini, D. Orecchia, A. Pazzaglia, M. Zavelani-Rossi, M. Passoni
Summary: In this study, porous, fractal-like nanostructured carbon materials, known as carbon nanofoam, were fabricated using Pulsed Laser Deposition (PLD) technique. The role of key PLD parameters on nanofoam characteristics was investigated, and a comparison between nanosecond (ns-PLD) and femtosecond (fs-PLD) regimes was drawn. New insights about carbon nanofoam deposition and characterization were gained, opening new perspectives in the fabrication of nanostructured films with precisely controlled properties.
APPLIED SURFACE SCIENCE
(2022)
Article
Engineering, Electrical & Electronic
[Anonymous]
Summary: Authors are requested to submit unpublished manuscripts for inclusion in an upcoming event.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2022)
Article
Chemistry, Analytical
T. V. Beatriceveena, K. I. Gnanasekar
Summary: Research on delafossite compounds has been focused on their layered structure and chemical or optoelectronic properties for industrial applications. However, synthesizing thin films has been challenging due to the low symmetry rhombohedral structures. This study successfully deposited AgInO2 thin films on glass substrate using pulsed laser deposition with high oxygen pressure, and the films exhibited n-type behavior and high selectivity towards hydrogen.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Physics, Applied
A. Osada, R. Tamaki, W. Lin, I. Nakamura, A. Noguchi
Summary: We developed a fiber-based pulsed laser ablation method to generate a jet of neutral strontium atoms. The generated strontium beam was characterized to have a transverse temperature of 800 K and a longitudinal velocity of 2300 m/s. Our device provides a compact and cryo-compatible atom source with minimized device footprints and reduced complexity of vacuum systems, which is beneficial for cold-atom experiments and potential applications in atomic and molecular sciences.
APPLIED PHYSICS LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Beilei Yuan, Haoming Wei, Jingwei Li, Yu Zhou, Fan Xu, Jinkai Li, Bingqiang Cao
Summary: In this study, high-quality CsPbBr3 films were epitaxially grown on SrTiO3 substrates using pulsed laser deposition (PLD), showing precise composition, designed crystalline orientation, and controlled thickness. The CsPbBr3 films exhibited low defects in the bandgap and displayed typical thermally activated carrier behavior, confirming their quasi-intrinsic semiconductor nature. Overall, the results suggest that CsPbBr3 films with high crystal quality and low defect density can be grown epitaxially for potential applications in superlattices and quantum wells.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Benjamin A. Reeves, Myles A. Steiner, Thomas E. Carver, Ze Zhang, Aaron M. Lindenberg, Bruce M. Clemens
Summary: We successfully separated single-crystalline multilayer III-V solar cells from GaAs substrates using an unfocused Nd:YAG laser pulse. The resulting device has a power conversion efficiency of 17.4% and an open-circuit voltage of 1.07 V, comparable to cells produced via conventional processes.
CELL REPORTS PHYSICAL SCIENCE
(2023)
Article
Crystallography
Enrique Zanardi, Silvana Radescu, Andres Mujica, Placida Rodriguez-Hernandez, Alfonso Munoz
Summary: In this paper, the behavior of DyScO3 perovskite under high pressures (up to 65 GPa) is theoretically studied. The structural and vibrational properties, elastic response, and stability are analyzed. A candidate high-pressure phase for this material is also proposed.
Article
Crystallography
Alfonso Munoz, Placida Rodriguez-Hernandez
Summary: In this study, we used the Density Functional Theory to analyze the structural, electronic, dynamic, and elastic properties of Ca3Y2Ge3O12 garnet under hydrostatic pressure. We reported the equation of state, compressibility, and structural evolution of the compound, as well as the change in infrared, silent, and Raman frequencies and their pressure coefficients. We also studied the dependence of elastic constants and mechanical and elastic properties on pressure. Our findings indicate that the garnet becomes mechanically unstable at 45.7 GPa, and soft phonons are present at 34.4 GPa, indicating dynamical instability above this pressure.
Article
Materials Science, Multidisciplinary
Robin Turnbull, Javier Gonzalez-Platas, Akun Liang, Dequan Jiang, Yonggang Wang, Catalin Popescu, Placida Rodriguez-Hernandez, Alfonso Munoz, Jordi Ibanez, Daniel Errandonea
Summary: We conducted an experimental and theoretical high-pressure study on Na3Bi(IO3)6 and found a first-order pressure-induced phase transition at around 9.5 GPa. This phase transition resulted in a doubling of the primitive cell volume and a decrease in the volume per formula unit. The transition also led to a decrease in the indirect electronic bandgap and revealed highly anisotropic compressibility of the ambient pressure phase.
RESULTS IN PHYSICS
(2023)
Article
Chemistry, Physical
Natalia Majewska, Alfonso Munoz, Ru-Shi Liu, Sebastian Mahlik
Summary: This study compares the changes in the luminescence properties of Ga2O3:Cr3+ modified by Al or Sc ion substitution (chemical pressure) and hydrostatic pressure. Ga2-x Al x O3:Cr3+ exhibits the same behavior under chemical and mechanical pressure, while Ga2-x Sc x O3:Cr3+ shows different behavior. Al substitution affects the crystal volume but not the chemical bond angles in the Cr3+ local environment, whereas Sc ions cause lattice distortion and influence the chemical bond lengths and angles. The energy structure diagrams of the d(3) configuration of Cr3+ ion as a function of pressure are calculated by considering the pressure dependence of the Racah parameters. It is suggested that the method and diagrams presented in this paper should be used for interpreting high-pressure experiments involving Cr3+ and other transition metals.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Physical
O. Gomis, R. Vilaplana, E. Perez-Gonzalez, J. Ruiz-Fuertes, P. Rodriguez-Hernandez, A. Munoz, D. Errandonea, A. Segura, D. Santamaria-Perez, P. Alonso-Gutierrez, M. L. Sanjuan, I. M. Tiginyanu, V. V. Ursaki, F. J. Manjon
Summary: Optical absorption measurements were performed on two phases (defect stannite and defect chalcopyrite) of the ordered-vacancy compound ZnGa2Se4. The direct bandgap energy of both phases exhibited a non-linear pressure dependence with a blueshift up to 10 GPa and a redshift at higher pressures. The different behavior of the phases in these pressure ranges was discussed in relation to pressure-induced order-disorder processes at cation sites. Measurements on downstroke after increasing pressure to 22 GPa showed a decrease in the direct bandgap energy compared to the original samples, indicating the formation of different disordered phases on decreasing pressure.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Alka B. Garg, David Vie, Placida Rodriguez-Hernandez, Alfonso Munoz, Alfredo Segura, Daniel Errandonea
Summary: Through diffuse reflectivity measurements in InNbO4, ScNbO4, YNbO4, and eight rare-earth niobates, it is found that Tauc plot analysis gives erroneous estimates of the bandgap energy, while accurate results are obtained considering excitonic contributions using the Elliot-Toyozawa model. The bandgaps are 3.25 eV for CeNbO4, 4.35 eV for LaNbO4, 4.5 eV for YNbO4, and 4.73-4.93 eV for SmNbO4, EuNbO4, GdNbO4, DyNbO4, HoNbO4, and YbNbO4. The results indicate that rare-earth substitution has little effect on the bandgap energy and that they have the largest bandgap due to the mainly contribution from Nb 4d and O 2p orbitals near the Fermi level. YNbO4, CeVO4, and LaNbO4 have smaller bandgaps because of the contribution from rare-earth atom 4d, 5d, or 4f orbitals to the states near the Fermi level.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Inorganic & Nuclear
Indrani. G. Shanmugapriya, Supratik Mukherjee, Alfonso Munoz, Ganapathy Vaitheeswaran, Srinivasan Natarajan
Summary: In this study, compounds belonging to the palmierite structure with different transition metal substitutions were prepared and their optical properties were examined. The substitution of transition metals was found to reduce the overall band gap, and band structure calculations supported this finding by providing orbital information.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
E. Bandiello, S. Gallego-Parra, A. Liang, J. A. Sans, V. Cuenca-Gotor, E. Lora da Silva, R. Vilaplana, P. Rodriguez-Hernandez, A. Munoz, D. Diaz-Anichtchenko, C. Popescu, F. G. Alabarse, C. Rudamas, C. Drasar, A. Segura, D. Errandonea, F. J. Manjon
Summary: GaGeTe is a layered topological semimetal with two different polytypes, a-GaGeTe and b-GaGeTe. In this study, the high-pressure behavior of these polytypes is investigated through experimental and theoretical methods. The results reveal anisotropic compressibility, phase transitions, and a transition to higher symmetry structures at high pressure. The electronic properties of GaGeTe resemble those of III-VI semiconductors, and pressure-induced amorphization is observed.
MATERIALS TODAY ADVANCES
(2023)
Article
Physics, Condensed Matter
Rahma Khediri, Dalila Hammoutene, Kamel Kassali, P. Rodriguez-Hernandez, Alfonso Munoz
Summary: This paper presents an ab initio study on the properties of Ti2InN, including structural, elastic, vibrational, and thermodynamic properties, using the Density Functional Theory. The study analyzes the evolution of structural properties under hydrostatic pressure, the pressure dependence of vibrational properties, elastic constants, and mechanical properties. It also investigates the thermodynamic properties in a temperature range from 0 to 1000 K.
COMPUTATIONAL CONDENSED MATTER
(2023)
Article
Materials Science, Multidisciplinary
Tania Garcia-Sanchez, Samuel Gallego-Parra, Akun Liang, Jose Luis Rodrigo-Ramon, Alfonso Munoz, Placida Rodriguez-Hernandez, Javier Gonzalez-Platas, Juan angel Sans, Vanesa Paula Cuenca-Gotor, Hussien H. Osman, Catalin Popescu, Veaceslav Ursaki, Ion M. Tiginyanu, Daniel Errandonea, Francisco Javier Manjon
Summary: The effect of pressure on the structural, vibrational, and optical properties of room-temperature crystallized PbGa2S4 is investigated. X-ray diffraction, Raman scattering, and optical-absorption measurements are conducted at pressures beyond 20 GPa, and the results are compared to ab initio calculations and related compounds. The study reveals a partially reversible pressure-induced decomposition of PbGa2S4 into a mixture of Pb6Ga10S21 and Ga2S3 above 15 GPa, offering a route for the high-pressure synthesis of Pb6Ga10S21, which is isostructural to the stable Pb6In10S21 compound.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Inorganic & Nuclear
Alejandro Martinez Serra, Archit Dhingra, Maria Carmen Asensio, Jose Antonio Real, Juan Francisco Sanchez Royo
Summary: Temperature dependent X-ray photoemission spectroscopy (XPS) was used to study the spin-crossover (SCO) transition in the nanocrystals of 3D Hoffman-like {Fe(pz)[Pt(CN)(4)]}. The temperature-dependent variations in the Fe 2p core-level spectrum provide clear evidence of the spin-state transition in this SCO complex. The lack of discernible temperature-driven shifts in the binding energies of the N 1s core-level components may be due to the immunity of its HS electronic configuration to thermal fluctuations. The high-spin fraction versus temperature plot extracted from XPS measurements indicates that the surface of the nanocrystals of {Fe(pz)[Pt(CN)(4)]} is in the high-spin state at room temperature, making it promising for room-temperature spintronics and quantum information science applications.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Physical
Alejandro Martinez Serra, Archit Dhingra, Maria Carmen Asensio, Jose Antonio Real, Juan Francisco Sanchez Royo
Summary: Temperature dependent X-ray photoemission spectroscopy (XPS) was used to study the Fe 2p and N 1s core levels of Fe(ii) spin crossover (SCO) complexes. The Fe 2p core-level spectra showed spin state transitions in these SCO complexes, consistent with previous studies. The temperature dependence of the N 1s core-level binding energy provided further insights into the ligand-to-metal charge transfer phenomenon.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Meteorology & Atmospheric Sciences
Xiaoyi Zhao, Vitali Fioletov, Alberto Redondas, Julian Groebner, Luca Egli, Franz Zeilinger, Javier Lopez-Solano, Alberto Berjon Arroyo, James Kerr, Eliane Maillard Barras, Herman Smit, Michael Brohart, Reno Sit, Akira Ogyu, Ihab Abboud, Sum Chi Lee
Summary: The Brewer ozone spectrophotometer is a standard ozone-monitoring instrument of the World Meteorological Organization's Global Atmosphere Watch since the 1980s. Its measurement accuracy relies on the calibration of world reference instruments, which are maintained by Environment and Climate Change Canada. Regional calibration needs are coordinated by the Regional Brewer Calibration Center for Europe. The study focuses on the challenges and uncertainties of implementing the primary calibration method and provides scientific advice on its implementation.
ATMOSPHERIC MEASUREMENT TECHNIQUES
(2023)
Article
Chemistry, Multidisciplinary
Ivan da Silva, Gerardo Gil de Cos, Cristina Gonzalez-Silgo, Javier Lopez-Solano, Andres Mujica, Nivaria R. Ramirez-Rodriguez, Manuel E. Torres
Summary: The solid-state synthesis and phase transitions of RE2(MoO4)3 (RE equivalent to Nd, Sm, Eu, and Gd) samples were investigated using X-ray thermodiffraction with synchrotron radiation. The formation and coexistence of intermediate phases were explained by common structural motifs. The reversible and reconstructive alpha [La2(MoO4)3] <-> beta phase transition was observed, clarifying previous controversies.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Chemistry, Physical
Alka B. Garg, David Vie, Placida Rodriguez-Hernandez, Alfonso Munoz, Alfredo Segura, Daniel Errandonea
Summary: Diffuse reflectivity measurements were performed on InNbO4, ScNbO4, YNbO4, and eight rare-earth niobates. Tauc plot analysis provided erroneous estimates of the bandgap energy for InNbO4 and ScNbO4, while accurate results were obtained using the Elliot-Toyozawa model considering excitonic contributions. The bandgaps were found to be 3.25 eV for CeNbO4, 4.35 eV for LaNbO4, 4.5 eV for YNbO4, and 4.73-4.93 eV for SmNbO4, EuNbO4, GdNbO4, DyNbO4, HoNbO4, and YbNbO4. The influence of rare-earth substitution on bandgap energy was minimal, and the largest bandgap resulted from the dominance of Nb 4d and O 2p orbitals near the Fermi level.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
