Article
Materials Science, Multidisciplinary
Mekan Piriyev, Gabriel Loget, Yoan Leger, Hanh Vi Le, Lipin Chen, Antoine Letoublon, Tony Rohel, Christophe Levallois, Julie Le Pouliquen, Bruno Fabre, Nicolas Bertru, Charles Cornet
Summary: This work demonstrates the extension of the classical concept of band gap engineering to the engineering of band lineups between semiconducting photoelectrodes and electrolytes. The performances of various photoelectrodes were studied, and it is shown that alloying can effectively adjust both the band gaps and the band lineups. This band lineup engineering strategy is of great importance for addressing specific redox reactions in electrolytes.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Physics, Applied
Zhenni Yang, Xiangyu Xu, Yan Wang, Siliang Kuang, Duanyang Chen, Hongji Qi, K. H. L. Zhang
Summary: Si-doped beta-Ga2O3 thin films grown on vicinal a-Al2O3 (0001) substrates exhibit high electrical conductivity and deep ultraviolet (DUV) transparency, making them promising candidates for transparent electrodes. The use of miscut Al2O3 substrates promotes improved crystal quality and electrical properties. The Si-doped films achieved a high conductivity of 37 S cm(-1) and average DUV transparency of 85% on a 6 degrees miscut substrate. The films also exhibit low work function, making them suitable for efficient electron injection in DUV optoelectronic devices.
APPLIED PHYSICS LETTERS
(2023)
Article
Energy & Fuels
Ivan Garcia, Laura Barrutia, Shabnam Dadgostar, Manuel Hinojosa, Andrew Johnson, Ignacio Rey-Stolle
Summary: Efforts to reduce the formation of cracks during growth of GaInP/GaInAs/Ge 3-junction solar cells on Ge|Si virtual substrates have been made by thinning the structure. Theoretical analysis suggests that the GaInAs middle cell can be drastically thinned while maintaining efficiency. Experimental results demonstrate that the formation of cracks is prevented in thinned structures.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2021)
Article
Engineering, Electrical & Electronic
Yi-Ting Cheng, Hsien-Wen Wan, Tien-Yu Chu, Tun-Wen Pi, Jueinai Kwo, Minghwei Hong
Summary: Through three cycles of O-2 exposure and annealing, the GeOx content on the Si/Ge surface was reduced, leading to a decrease in electron traps and better utilization of high-kappa material.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Chemistry, Physical
Ying-Guang Liu, Heng-Xuan Li, Yu-Jun Qiu, Xin Li, Chun-Pu Huang
Summary: This paper investigates the effect of embedding Sn nanoparticles at the Si/Ge interface on interfacial thermal conductance (ITC) using non-equilibrium molecular dynamics (NEMD) simulations. The results show that the ITC can be enhanced by 1.95 times with an appropriate number and diameter of nanoparticles, which can be attributed to the enhanced inelastic phonon scattering facilitated by Sn nanoparticles. However, when the number of nanoparticles exceeds a certain value, elastic phonons dominate heat transport, leading to a decrease in ITC. Additionally, increasing temperature leads to a higher frequency phonon excitation, which increases phonon inelastic scattering and interface transmission.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Physics, Applied
Junjie Yang, Zizhuo Liu, Pamela Jurczak, Mingchu Tang, Keshuang Li, Shujie Pan, Ana Sanchez, Richard Beanland, Jin-Chuan Zhang, Huan Wang, Fengqi Liu, Zhibo Li, Samuel Shutts, Peter Smowton, Siming Chen, Alwyn Seeds, Huiyun Liu
Summary: This paper investigates the replacement of a thin Ge buffer layer for part of the GaAs buffer layer in a III-V quantum-dot laser grown on Si, resulting in improved laser performance. By using this approach, a very high operating temperature of 130 degrees Celsius has been demonstrated for the InAs/GaAs QD laser.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Tyler Stabile, Yize Stephanie Li
Summary: This study investigates the deposition of strained alpha-Sn thin films on highly lattice-mismatched Ge (100) substrates by physical vapor deposition, using different cleaning methods. The results show that the morphology of thin films is significantly influenced by the cleaning method. It is demonstrated that the alpha-Sn thin films deposited on Ge substrates exhibit n-type electrical properties and may hold potential for advanced electronics and photonics applications.
MATERIALS TODAY ADVANCES
(2021)
Article
Physics, Applied
Umesh Kumar Sinha, Antarjami Sahoo, Prahallad Padhan
Summary: This study used the sputtered pulsed plasma method to grow La0.7Sr0.3MnO3 (LSMO) films on (001) oriented Si, and confirmed the presence of a thinner, less dense, and highly resistive LSMO film at the interface below the conducting phase through transmission electron microscope imaging and electronic transport. Thicker LSMO films showed an anomaly around the Curie temperature in temperature-dependent resistivity and magnetoresistance, and the conduction in these films below the low-temperature resistivity minimum was dominated by Kondo-like scattering. The results demonstrated the potential to modulate electrical properties of future electronic devices and encouraged further exploration of complex oxides grown on bare Si substrates for their multi-functionalities.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Zichao Li, Ye Yuan, Rene Hubner, Viktor Begeza, Thomas Naumann, Lars Rebohle, Olav Hellwig, Manfred Helm, Kornelius Nielsch, Slawomir Prucnal, Shengqiang Zhou
Summary: Researchers successfully prepared B20-MnSi films on Si(100) substrates, offering better conditions for practical applications. The regrown layer exhibits a higher Curie temperature compared to bulk material, and the magnetic skyrmion signature was confirmed through magnetic and transport measurements. Flash-lamp annealing in the millisecond range shows promise for fabricating Si-based skyrmionic devices.
MATERIALS TODAY PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Aleksandr Lenshin, Pavel Seredin, Dmitry Goloshchapov, Ali O. Radam, Andrey Mizerov
Summary: For the first time, this study demonstrates the advantages of using a compliant hybrid substrate of porSi/SiC for growing high-quality ultra-thin nanostructured AlxGa1-xN/GaN heterostructures using molecular beam epitaxy. The experimental and computational data obtained in this work are important for understanding the physics and technology of AlxGa1-xN/GaN nanoheterostructures and their potential applications in optoelectronics.
Article
Materials Science, Multidisciplinary
Renjiu Hu, Zhiting Tian
Summary: This work presents direct evidence of phonon Anderson localization by observing the exponential decay of mode-resolved transmissions. The study successfully captures localized modes in different structures, even when thermal conductivity trend is monotonically upward.
Article
Computer Science, Information Systems
Mahmoud Shaban, Abdelrahman Zkria, Tsuyoshi Yoshitake
Summary: N-doped UNCD/a-C:H composite films grown on Si substrates were investigated using temperature-dependent impedance spectroscopy, revealing a low-frequency conduction mechanism and a relaxation process originating from space charges in grain boundaries. The incorporation of nitrogen in the composite film increased the concentration of charge carriers within grain boundaries, enhancing their conductivity. Additionally, the capacitance corresponding to grain boundaries was greater than that from UNCD grains due to differences in grain size and grain-boundary width in the composite.
Article
Chemistry, Physical
Avijit Dalal, Shyam Murli Manohar Dhar Dwivedi, Chiranjib Ghosh, Rini Lahiri, Mohamed Henini, Aniruddha Mondal
Summary: Electron beam evaporation technique was used to synthesize TiO2, Mg0.1Ti0.9O2, and Mg0.2Ti0.8O2 thin films on (100) n-type GaAs substrates. Various analyses were conducted to study the properties of the films, showing changes in bandgap energy and defect level transitions with increased Mg incorporation. The results provide insights into the effect of Mg concentration on the characteristics of the thin films.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Electrical & Electronic
Noriyuki Uchida, Yuta Nakajima, Leonid Bolotov, Wen-Hsin Chang, Tatsuro Maeda, Yuji Ohishi
Summary: The thermal transport properties of Amorphous Al2O3 films deposited on Ge substrates were studied using the thermo-reflectance method. It was found that the thermal conductivity of the films was significantly lower compared to crystalline Al2O3, and the thermal resistivity of the Al2O3/Ge interface was relatively high. Phonon-based and diffuson theories were used to simulate the thermal transport, with diffuson theory providing a better explanation for the observed low thermal conductivity of ALD-Al2O3.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Physics, Applied
Sien Wang, Qiyu Chen, Qing Hao
Summary: This study investigates the heat exchange between a solid material and the gas environment in miniature electronic devices. A two-layer model is proposed to evaluate the heat transfer coefficient of nanoporous Si thin films. The results confirm the dominance of air conduction in the heat transfer process and suggest the potential of increasing the heat transfer coefficient by introducing ultra-fine nanoporous patterns.
APPLIED PHYSICS LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Joan Rafols-Ribe, Riccardo Dettori, Pablo Ferrando-Villalba, Marta Gonzalez-Silveira, Llibertat Abad, Aitor F. Lopeandia, Luciano Colombo, Javier Rodriguez-Viejo
PHYSICAL REVIEW MATERIALS
(2018)
Article
Chemistry, Analytical
Gustavo Goncalves Dalkiranis, Pablo Ferrando-Villalba, Aitor Lopeandia-Fernandez, Llibertat Abad-Munoz, Javier Rodriguez-Viejo
Article
Chemistry, Multidisciplinary
Pablo Ferrando-Villalba, Antonio Pablo Perez-Marin, Llibertat Abad, Gustavo Goncalves Dalkiranis, Aitor E. Lopeandia, Gemma Garcia, Javier Rodriguez-Viejo
Article
Physics, Applied
P. Ferrando-Villalba, D. Takegami, Ll. Abad, J. Rafols-Ribe, A. Lopeandia, G. Garcia, J. Rodriguez-Viejo
PHYSICAL REVIEW APPLIED
(2019)
Article
Materials Science, Multidisciplinary
Bingge Zhao, Bin Yang, Javier Rodriguez-Viejo, Mannan Wu, Christoph Schick, Qijie Zhai, Yulai Gao
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2019)
Article
Physics, Multidisciplinary
Cristian Rodriguez-Tinoco, Marta Gonzalez-Silveira, Joan Rafols-Ribe, Ana Vila-Costa, Julio Cesar Martinez-Garcia, Javier Rodriguez-Viejo
PHYSICAL REVIEW LETTERS
(2019)
Article
Physics, Multidisciplinary
A. Vila-Costa, J. Rafols-Ribe, M. Gonzalez-Silveira, A. F. Lopeandia, Ll. Abad-Munoz, J. Rodriguez-Viejo
PHYSICAL REVIEW LETTERS
(2020)
Article
Chemistry, Physical
P. Ferrando-Villalba, Shunda Chen, A. F. Lopeandia, F. X. Alvarez, M. Alonso, M. Garriga, J. Santiso, G. Garcia, A. R. Goni, D. Donadio, J. Rodriguez-Viejo
JOURNAL OF PHYSICAL CHEMISTRY C
(2020)
Article
Chemistry, Multidisciplinary
Julio Cesar Martinez-Garcia, Alexandre Serraima-Ferrer, Aitor Lopeandia-Fernandez, Marco Lattuada, Janak Sapkota, Javier Rodriguez-Viejo
Summary: This study predicts the effective mechanical reinforcement of polymeric nanocomposites using a generalized three-phase-series-parallel model considering percolation and the interfacial glassy region. The research demonstrates that the nanometer range glassy interphase between filler and matrix should be considered in interpreting enhanced mechanical properties. Experimental results fitted with theoretical predictions show good agreement, suggesting potential for creating new materials with fundamental technological applications.
Review
Physics, Multidisciplinary
Cristian Rodriguez-Tinoco, Marta Gonzalez-Silveira, Miguel Angel Ramos, Javier Rodriguez-Viejo
Summary: This review article summarizes the latest research progress of ultrastable glasses, including equilibrium mechanisms, liquid state transformation, and low temperature properties. The article also provides a list of properties for all materials known to form stable glasses.
RIVISTA DEL NUOVO CIMENTO
(2022)
Article
Physics, Multidisciplinary
Ana Vila-Costa, Marta Gonzalez-Silveira, Cristian Rodriguez-Tinoco, Marta Rodriguez-Lopez, Javier Rodriguez-Viejo
Summary: The traditional understanding of the glass transition is challenged by experiments showing that isolated regions of liquid can form within the glassy matrix. The nature of the glass transition depends on the ratio between the relaxation time of the glass and the alpha relaxation time of the equilibrated liquid. At high ratios, high-mobility regions transition directly into the equilibrated liquid, while at low ratios, the glass transition occurs through cooperative relaxation dynamics throughout the material.
Article
Physics, Multidisciplinary
Marta Ruiz-Ruiz, Ana Vila-Costa, Tapas Bar, Cristian Rodriguez-Tinoco, Marta Gonzalez-Silveira, Jose Antonio Plaza, Jorge Alcala, Jordi Fraxedas, Javier Rodriguez-Viejo
Summary: A spatio-temporal map of the relaxation dynamics of a highly stable glass into its supercooled liquid is built using real-time atomic force microscopy imaging. This methodology enables direct visualization of the liquid phase progression and the presence of localized fast mobility regions separated by giant length scales. A clear correlation between dynamic length and time scales in glasses is established. This approach may also be applicable to unveil the microscopic structure and dynamics of other glass-forming systems with much shorter length and time scales, including liquid-cooled glasses.
Article
Physics, Multidisciplinary
Manuel Moratalla, Marta Rodriguez-Lopez, Cristian Rodriguez-Tinoco, Javier Rodriguez-Viejo, Rafael J. Jimenez-Rioboo, Miguel A. Ramos
Summary: Recent findings of structural glasses with extremely high stability have raised questions about the persistence of low-temperature glassy anomalies. By studying a specific type of ultrastable glass, it is shown that the suppression of two-level systems in glasses depends on the degree of stability, not on anisotropy.
COMMUNICATIONS PHYSICS
(2023)
Meeting Abstract
Chemistry, Multidisciplinary
Javier Rodriguez-Viejo, Marta Gonzalez-Silveira, Cristian Rodriguez-Tinoco, Aitor Lopeandia, Ana Vila, Joan Rafols-Ribe
ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY
(2019)
Article
Chemistry, Physical
A. Vila-Costa, J. Rafols-Ribe, M. Gonzalez-Silveira, A. Lopeandia, J. Ll Tamarit, J. Rodriguez-Viejo
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2019)