Article
Physics, Applied
Takanori Asano, Manabu Tezura, Masumi Saitoh, Hiroki Tanaka, Jun Kikkawa, Koji Kimoto
Summary: We observed the nanoscale distribution of subgap excitations induced by Ga-ion beam processing in beta-Si3N4 using electron energy-loss spectroscopy. By combining crystallinity, composition, and bandgap measurements, we found that defects excited at different energy levels exhibit different dependence trends with respect to crystallinity. This proposed technique can effectively distinguish between various amorphous materials.
APPLIED PHYSICS EXPRESS
(2022)
Article
Multidisciplinary Sciences
Yue-Hui Li, Rui-Shi Qi, Ruo-Chen Shi, Jian-Nan Hu, Zhe-Tong Liu, Yuan-Wei Sun, Ming-Qiang Li, Ning Li, Can-Li Song, Lai Wang, Zhi-Biao Hao, Yi Luo, Qi-Kun Xue, Xu-Cun Ma, Peng Gao
Summary: This study investigates the interface thermal conductance of nitride-based high-power devices using atomically resolved vibrational electron energy-loss spectroscopy, and observes different interface phonon modes and their contributions to thermal conductance.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Chemistry, Multidisciplinary
Giovanni Borgh, Corrado Bongiorno, Salvatore Cosentino, Antonino La Magna, Salvatore Patane, Silvia Scalese, Antonio Terrasi, Giacomo Torrisi, Rosaria A. Puglisi
Summary: The study investigates the growth of AZO on silicon nanowires (SiNWs) and examines its morphological evolution. It is found that AZO initially forms crystalline nano-islands and later coalesces into a conformal polycrystalline shell on the substrate. The deposition process of AZO leads to the growth of a polycrystalline matrix between SiNWs, resulting in the formation of hook-shaped SiNWs covered by AZO.
Article
Optics
Q. Li, C. P. Ho, H. Tang, M. Okano, K. Ikeda, S. Takagi, M. Takenaka
Summary: A novel Si racetrack optical modulator integrated with a III-V/Si hybrid MOS optical phase shifter was fabricated with advantages of miniaturization, low energy consumption, and high modulation bandwidth.
Article
Nanoscience & Nanotechnology
Martin Ek, C. Leon M. Petersson, Jesper Wallentin, David Wahlqvist, Aylin Ahadi, Magnus Borgstrom, Reine Wallenberg
Summary: Nanowire growth enables creation of embedded heterostructures, but poses challenges for compositional characterization through transmission electron microscopy. Residual strain in certain regions can cause the two characterization techniques to diverge from the true value.
Article
Optics
Yaonan Hou, Ilias Skandalos, Mingchu Tang, Hui Jia, Huiwen Deng, Xuezhe Yu, Yasir Noori, Spyros Stathopoulos, Siming Chen, Huiyun Liu, Alwyn Seeds, Graham Reed, Frederic Gardes
Summary: We investigate the surface and interface engineering on InAs quantum dot emitters using edge-emitting light-emitting diodes encapsulated with non-stoichiometric silicon nitride (SiN) layers. Our findings show that silicon-rich SiN is an excellent choice for both electrical and optical passivation, reducing surface recombination. However, N-rich SiN deposited by the same method does not provide effective passivation under electrical injection. This research provides important insights for the monolithic integration of InAs quantum dot emitters with CMOS photonics components.
JOURNAL OF LUMINESCENCE
(2023)
Article
Multidisciplinary Sciences
Pengyan Wen, Preksha Tiwari, Svenja Mauthe, Heinz Schmid, Marilyne Sousa, Markus Scherrer, Michael Baumann, Bertold Ian Bitachon, Juerg Leuthold, Bernd Gotsmann, Kirsten E. Moselund
Summary: This study successfully achieved the seamless integration of III-V nanostructures on silicon and demonstrated the performance of scaled and waveguide coupled III-V photodiodes. Furthermore, it was found that the temperature increase during device operation as an emitter was only approximately 15 K according to experimental and simulation results.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Xingliang Li, He Wang, Wudi Zhang, Renjie Li, Ningyu Ren, Sanlong Wang, Yuxiang Li, Qiaojiao Zou, Wei Han, Qixing Zhang, Guofu Hou, Qian Huang, Shengzhi Xu, Chaohua Zhang, Qiang Sun, Ying Zhao, Xiaodan Zhang
Summary: The use of a transparent conductive adhesive (TCA) successfully enables bonding in III-V/silicon tandem solar cells, providing a new solution to the challenge of vacuum bonding in industrialized micron-sized pyramid silicon cells. The TCA exhibits low contact resistance, high transmittance, and good stability, showing great potential in enhancing the performance of solar cells.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Optics
Ya Han, Xian Zhang, Rui Ma, Mengyue Xu, Heyun Tan, Jie Liu, Ruijun Wang, Siyuan Yu, Xinlun Cai
Summary: The increasing traffic has driven the demand for compact, high-speed, and low-power-consumption optical transmitters. In this study, a widely tunable optical transmitter based on a thin-film lithium niobite platform is demonstrated, and its performance characteristics are presented.
Article
Optics
Wen-Qi Wei, An He, Bo Yang, Zi-Hao Wang, Jing-Zhi Huang, Dong Han, Ming Ming, Xuhan Guo, Yikai Su, Jian-Jun Zhang, Ting Wang
Summary: This article introduces an embedded InAs/GaAs quantum dot (QD) laser directly grown on a SOI substrate, enabling monolithic integration with silicon waveguides. By resolving the epitaxy and fabrication challenges, embedded III-V lasers on SOI with continuous-wave lasing are obtained, providing a scalable and low-cost epitaxial method for future high-density photonic integration.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Multidisciplinary Sciences
Fangyun Lu, Huiliu Wang, Mengqi Zeng, Lei Fu
Summary: This article provides an overview of the structures, properties, and synthesis strategies of ultrathin III-V semiconductors, with a focus on space confinement, atomic substitution, adhesion energy regulation, and epitaxial growth. The current challenges and future development directions of ultrathin III-V semiconductors are also summarized.
Review
Chemistry, Multidisciplinary
Markus Scherrer, Noelia Vico Trivino, Svenja Mauthe, Preksha Tiwari, Heinz Schmid, Kirsten E. Moselund
Summary: The article reviews various methods for monolithic III-V integration, with a focus on the results achieved using the TASE technique. This method enables self-aligned in-plane monolithic integration of III-V materials on silicon by selectively replacing pre-patterned silicon structures. The study discusses the realization of in-plane integrated photonic structures, particularly focusing on light emitters and high-speed detectors covering the telecom wavelength spectral range, which may lead to fully integrated, densely packed, and scalable photonic integrated circuits.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Physical
Alexander S. Gudovskikh, Dmitri A. Kudryashov, Artem Baranov, Alexander Uvarov, Ivan A. Morozov, Anatoliy O. Monastyrenko, Alina A. Maksimova, Alexey Nashchekin, Ekaterina A. Vyacheslavova, Vladimir N. Nevedomskiy
Summary: Two different approaches, conventional PECVD and PE-ALD, were used to fabricate photoactive GaP(N) layers. The PECVD process requires strong H2 dilution and high RF power for microcrystalline GaP growth, while the PE-ALD process allows for easy control of structural properties and stoichiometric composition. Further technology development is needed to improve the defect density and quality of the doped layers for photovoltaic applications.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Chemistry, Physical
Rachana Yogi, Neeraj K. Jaiswal
Summary: The study compared the sensitivity of Ga, Al, and B based nitride nanoribbons as CS2 scavengers, showing that adsorption at the edges results in metallic properties while adsorption in the middle leads to physisorption. The interaction with CS2 impacts the electronic and transport properties of the nitride nanoribbons, with recovery time significantly longer for edge adsorption and more favorable reusability for center adsorption, useful for designing efficient CS2 scavengers.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
Piu Rajak, Regina Ciancio, Antonio Caretta, Simone Laterza, Richa Bhardwaj, Matteo Jugovac, Marco Malvestuto, Paolo Moras, Roberto Flammini
Summary: We conducted a study on the sub-nanometer interlayer of crystalline silicon nitride at the Ni/Si interface, examining its role as a barrier against atom diffusion using transmission electron microscopy measurements and energy dispersive X-ray analysis. The results revealed that discontinuous silicide areas can be formed just below the nitride layer, with composition matching that of the nickel disilicide. This reaction between nickel and silicon is believed to be caused by thermal strain experienced by the interface during the deposition of nickel at low temperature.
APPLIED SURFACE SCIENCE
(2023)
Article
Microscopy
Michael R. S. Huang, Alberto Eljarrat, Christoph T. Koch
Summary: Inline electron holography is used to recover amplitude and phase of an electron wave function passed through a thin specimen. Experimental parameters and data normalization significantly affect the retrieval of low spatial frequency information at medium magnifications. Although the phase reconstructed from experimental focal series may lack very low spatial frequency components, regularization schemes can effectively hide artifacts associated with this lack of information.
Article
Materials Science, Multidisciplinary
Javier Blanco-Portals, Francesca Peiro, Sonia Estrade
Summary: In this study, two new clustering analysis methods and dimensionality reduction methods (HDBSCAN and UMAP) were proposed for the segmentation of core-loss electron energy loss spectroscopy (EELS) spectrum images. The performances of HDBSCAN and UMAP were systematically compared to other methods using synthetic and experimental datasets, and better results were obtained. The results also showed that the combination of different algorithms can provide a more comprehensive understanding of the dataset studied.
MICROSCOPY AND MICROANALYSIS
(2022)
Article
Microscopy
J. Blanco-Portals, P. Torruella, F. Baiutti, S. Anelli, M. Torrell, A. Tarancon, F. Peiro, S. Estrade
Summary: The study highlights the analysis of energy loss near edge structures in EELS for precise characterization of elemental oxidation states and local atomic coordination. It emphasizes the importance of combining nonlinear least squares fitting with clustering analysis and provides a convenient software solution called WhatEELS.
Article
Nanoscience & Nanotechnology
Yuhang Zhao, Radwan M. Sarhan, Alberto Eljarrat, Zdravko Kochovski, Christoph Koch, Bernd Schmidt, Wouter Koopman, Yan Lu
Summary: Bimetallic nanostructures can generate a new type of photo-enhanced nanoreactors by utilizing photo-generated heat to accelerate catalytic reactions. The study demonstrates that the photothermal conversion of Au-Pd nanorods can be improved by coating with polydopamine or TiO2, resulting in increased reaction rates.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Physics, Applied
Gemma Martin, Lluis Lopez-Conesa, Daniel del Pozo, Quim Portillo, George Doundoulakis, Alexandros Georgakilas, Sonia Estrade, Francesca Peiro
Summary: This study compared different strategies to reduce the background defect density of GaN nanowires, through two different wet etching methods and rapid thermal annealing at 750°C, as well as explored the influence of SiNx coating. The results showed that annealing treatment can significantly reduce defect density, especially on NW surfaces coated with SiNx.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Xiaodan Wang, Leonhard Mayrhofer, Martin Keunecke, Sonia Estrade, Lluis Lopez-Conesa, Michael Moseler, Andreas Waag, Lothar Schaefer, Weidong Shi, Xiangjian Meng, Junhao Chu, Zhiyong Fan, Hao Shen
Summary: This study reports a room-temperature and rapid plasma hydrogenation strategy for fabricating H-TiO2 nanorods with controllable disordered shell, resulting in improved photoelectrochemical performance. The low-energy hydrogen ions with unique multiple penetration pathways can directly penetrate TiO2 and suppress bulk defects, leading to enhanced PEC activity.
Article
Energy & Fuels
Francesco M. Chiabrera, Federico Baiutti, Jacqueline M. Boergers, George F. Harrington, Lluis Yedra, Maciej O. Liedke, Joe Kler, Pranjal Nandi, Juan de Dios Sirvent, Jose Santiso, Miguel Lopez-Haro, Jose J. Calvino, Sonia Estrade, Maik Butterling, Andreas Wagner, Francesca Peiro, Roger A. De Souza, Albert Tarancon
Summary: This study investigates the impact of Mn deficiency on oxygen mass transport properties in perovskite oxides, and highlights the importance of antisite defects in mitigating the effects of nonstoichiometry on oxygen transport.
JOURNAL OF PHYSICS-ENERGY
(2022)
Article
Chemistry, Physical
Mengxi Lin, Guillem Montana, Javier Blanco, Lluis Yedra, Heleen van Gog, Marijn A. van Huis, Miguel Lopez-Haro, Jose Juan Calvino, Sonia Estrade, Francesca Peiro, Albert Figuerola
Summary: This study developed a new colloidal synthetic method for the preparation of hybrid Au-Ag2X nanoparticles in a simple way. The formation of stable ternary AuAg3X2 phase through a solid-state electrochemical reaction at the solid-solid interface facilitated the selective hetero-attachment of Au and Ag2X nanoparticles in solution and stabilized the whole hybrid system.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Physical
L. Bernadet, J. Segura-Ruiz, L. Yedra, S. Estrade, F. Peiro, D. Montinaro, M. Torrell, A. Morata, A. Tarancon
Summary: This article investigates the electrolyte-cathode interfaces in solid oxide fuel cells and presents advanced post-mortem characterization of different cell types. It is found that the barrier layer deposited by pulsed laser deposition (PLD) remains stable, prevents the formation of insulating phases, and avoids fracture, in contrast to the screen-printed barrier layers.
JOURNAL OF POWER SOURCES
(2023)
Article
Chemistry, Multidisciplinary
Alejandra Ruiz-Clavijo, Nicolas Perez, Olga Caballero-Calero, Javier Blanco, Francesca Peiro, Sergi Plana-Ruiz, Miguel Lopez-Haro, Kornelius Nielsch, Marisol Martin-Gonzalez
Summary: The resistance of an ordered 3D-Bi2Te3 nanowire nanonetwork was studied, and it was found that the increase in resistance at low temperatures can be explained by the Anderson model for localization. Angle-dependent magnetoresistance measurements revealed a distinctive weak antilocalization characteristic with a double feature associated with transport along two perpendicular directions dictated by the spatial arrangement of the nanowires. The observed localization effects may explain the enhancement of the Seebeck coefficient in the 3D-Bi2Te3 nanowire nanonetwork compared to individual nanowires.
Article
Engineering, Electrical & Electronic
Gemmn Martin, Catalin Coll, Lluis Lopez-Conesa, Jose Manuel Rebled, Enrique Barrigon, Ivan Garcia, Ignacio Rey-Stolle, Carlos Algora, Albert Cornet, Sonia Estrade, Francesca Peiro
Summary: The effect of CuPtB ordering on the optoelectronic properties of Ga0.5In0.5P was studied using in situ transmission electron microscopy measurements and density functional theory calculations. The presence of antiphase ordered domain boundaries and the anisotropy of the effective mass were found to contribute to the anisotropic electrical conductivity of CuPtB-type ordered GaInP thin films.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Wahib Aggoune, Alberto Eljarrat, Dmitrii Nabok, Klaus Irmscher, Martina Zupancic, Zbigniew Galazka, Martin Albrecht, Christoph Koch, Claudia Draxl
Summary: The perovskite barium stannate (BaSnO3) shows promise for electronic applications due to its transparency and high room-temperature mobility. A combined theoretical and experimental study provides a consistent picture of its electronic structure and optical excitations.
COMMUNICATIONS MATERIALS
(2022)