Article
Multidisciplinary Sciences
Marc Thelen, Nicolas Bochud, Manuel Brinker, Claire Prada, Patrick Huber
Summary: Assessing the mechanics of nanoporous silicon is challenging but crucial for new applications. Using non-destructive laser-excited elastic guided waves, the authors studied dry and liquid-infused single-crystalline porous silicon, revealing its complex mechanics and significant deviations from bulk silicon.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Physical
David F. Macias-Pinilla, Carlos Echeverria-Arrondo, Andres Fabian Gualdron Reyes, Said Agouram, Vicente Munoz-Sanjose, Josep Planelles, Ivan Mora-Sero, Juan Climente
Summary: Research shows that colloidal PbS NPLs may have an orthorhombic crystal structure instead of the rock-salt structure found in bulk materials. Calculations indicate that quantum confinement along the a crystallographic axis strengthens the indirect band gap, while confinement along the b and c axes favors a direct band gap.
CHEMISTRY OF MATERIALS
(2021)
Article
Optics
J. F. Algorri, F. Dell'Olio, Y. Ding, F. Labbe, V. Dmitriev, J. M. Lopez-Higuera, J. M. Sanchez-Pena, L. C. Andreani, M. Galli, D. C. Zografopoulos
Summary: We investigate a metasurface supporting a silicon-slot quasi-bound state in the continuum (qBIC) mode resonating in the near-infrared spectrum both theoretically and experimentally. The metasurface is composed of circular slots etched in a silicon layer on a sapphire substrate. By reducing the symmetry of the metasurface unit cell, we access the symmetry-protected mode and analyze its properties through finite-element full-wave and eigenfrequency analysis. The measured transmittance spectra confirm the excitation of the investigated qBIC mode with experimental quality factors exceeding 700. The resonant qBIC mode exhibits strong field confinement in the slots, leading to high sensitivity values for refractometry.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Rodion R. Reznik, Igor Ilkiv, Konstantin P. Kotlyar, Vladislav O. Gridchin, Dariya N. Bondarenko, Vera V. Lendyashova, Evgenii Ubyivovk, Anna S. Dragunova, Natalia Kryzhanovskaya, George E. Cirlin
Summary: This study successfully demonstrates the growth of AlGaAs nanowires and InGaAs quantum dots on a silicon substrate using molecular-beam epitaxy for the first time. The grown nanostructures exhibit photoluminescence signals in a wide wavelength range, including 1.3 μm emission, which is crucial for optical fiber transmission. Furthermore, radial InGaAs quantum wells are formed inside the nanowires in addition to the InGaAs quantum dots.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2022)
Review
Chemistry, Multidisciplinary
Xin Zhao, Chensheng Lin, Haotian Tian, Chao Wang, Ning Ye, Min Luo
Summary: Nonlinear optical (NLO) materials are essential for expanding the frequency range of solid-state lasers. Nitrides, with their large second-order NLO coefficients and wide band gaps, have emerged as highly promising NLO candidates. This review provides a comprehensive overview of reported and potential NLO nitrides, analyzing their crystal structures and exploring the correlations between structure and properties. The review also discusses existing challenges and offers insights into future advancements in the field.
MATERIALS CHEMISTRY FRONTIERS
(2023)
Article
Chemistry, Physical
Xiao Zhang, Xia Leng, Huabing Yin, Yuchen Ma
Summary: Traditional dipole-dipole coupling approximation does not apply to the excitation energy transfer in single-walled carbon nanotubes, with higher multipole interactions playing a major role. Electronic coupling related to dark excitons may sometimes be several orders of magnitude stronger than that related to bright ones, suggesting dark excitons might govern the excitation energy transfer in SWNTs. Dexter exchange interactions contribute little even with donor and acceptor in close proximity in SWNTs.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Materials Science, Multidisciplinary
I. A. Kokurin, N. S. Averkiev
Summary: Real semiconductors contain both donor and acceptor impurities, allowing a single carrier to be bounded by two impurity centers. For electron complexes near a simple conduction band, the spectral problem resembles the hydrogen molecule ion problem. In p-type semiconductors, the spectral problem for a single hole in the field of two attracting centers is more complicated due to the complex structure of the valence band.
Article
Chemistry, Physical
Ivan Marri, Simone Grillo, Michele Amato, Stefano Ossicini, Olivia Pulci
Summary: The electronic properties of hydrogenated, spherical SiGe and GeSi core-shell nanocrystals with different diameters are investigated. The results show that SiGe core-shell nanocrystals always exhibit a type II band-offset alignment, while small GeSi core-shell nanocrystals do not show this type of offset. Quantum confinement and strain drive the near-band-edge states to be mainly localized on Ge atoms in small GeSi nanocrystals. In larger GeSi nanocrystals, the formation of a type II offset can be engineered by adjusting both core and shell thickness. The factors determining the band-offset character at the Ge/Si interface are discussed in detail.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Physics, Applied
Mehmet Gunes, Jimmy Melskens, Arno H. M. Smets
Summary: Undoped hydrogenated amorphous silicon (a-Si:H) thin films deposited using radio frequency plasma-enhanced chemical vapor deposition (RF-PECVD) were studied under moderate dilution ratios of silane. The changes in multiple gap states in annealed and light-soaked states were identified using steady-state photoconductivity and improved dual beam photoconductivity (DBP) methods. Different gap states, named A, B, C, and X, were found in the annealed state. The A and B states, located below the dark Fermi level, showed correlation with defects detected by time-domain pulsed electron paramagnetic resonance (EPR) experiments. The C states defined the slow states in undoped a-Si:H, while the A, B, and X states defined the fast states.
JOURNAL OF APPLIED PHYSICS
(2023)
Review
Materials Science, Multidisciplinary
Ateet Dutt, Rafael Antonio Salinas, Shirlley E. Martinez-Tolibia, Juan Ramon Ramos-Serrano, Manmohan Jain, Leon Hamui, Carlos David Ramos, Ebrahim Mostafavi, Yogendra Kumar Mishra, Yasuhiro Matsumoto, Guillermo Santana, Vijay Kumar Thakur, Ajeet Kumar Kaushik
Summary: Research has shown that embedding silicon-based compound nanomaterials in matrices such as oxide, nitride, and carbide can improve their optical performance and industrial acceptability. However, exploring the emission mechanisms of these materials has remained a challenge for the past few decades. This review discusses the morphological and optoelectronic properties of Si-based compound nanomaterials and their correlation with quantum confinement effects and different surface states to find precise emission mechanisms.
ADVANCED PHOTONICS RESEARCH
(2023)
Article
Engineering, Electrical & Electronic
Shuang Liu, Weihang Zhang, Jincheng Zhang, Xiufeng Song, Yinhe Wu, Dazheng Chen, Shengrui Xu, Shenglei Zhao, Yue Hao
Summary: A high-electron-mobility transistor (HEMT) with AlN/GaN superlattice (SL) channel has been successfully demonstrated on a silicon substrate, achieving high performance with optimized breakdown voltage and output current. The trap states in the AlN/GaN SL channel were investigated, revealing a reduction in trap state density in the parasitic channel and specific energy levels in the main channel. This study represents a significant advancement in the development of SL channel HEMTs on cost-effective silicon substrates and provides a novel technology for high output current in AlGaN multichannel devices.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2021)
Article
Physics, Multidisciplinary
R. R. Reznik, V. O. Gridchin, K. P. Kotlyar, A. S. Dragunova, N. V. Kryzhanovskaya, Yu. B. Samsonenko, I. P. Soshnikov, A. I. Khrebtov, G. E. Cirlin
Summary: AlGaAs nanowires with InAs quantum dots were synthesized on the silicon surface by molecular-beam epitaxy. The morphology and optical properties of the grown nanostructures were studied. It was observed that the emission from the quantum dots occurred within the wavelength range of 780 to 970 nm. Possible explanations for the short-wave radiation from the quantum dots were proposed, such as the desorption of indium atoms and the presence of gallium atoms in the catalyst droplets during growth at a substrate temperature of 510 degrees C. This work provides new opportunities for integrating direct bandgap semiconductors with the silicon platform.
ST PETERSBURG POLYTECHNIC UNIVERSITY JOURNAL-PHYSICS AND MATHEMATICS
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Seref Kalem
Summary: Surface functionalization of silicon wafers using nanoscale fabrication techniques has attracted significant attention for its potential in photonic applications. The produced surfaces exhibit exciting optical properties, particularly in terms of emission and trapping of light across a wide spectrum. Various approaches have been employed to create such functional surfaces, but a detailed understanding of the radiative dynamics of the recombination processes is still lacking. In this study, we investigate the optical properties of nano sized silicon quantum pillar arrays using advanced characterization techniques.
OXIDE-BASED MATERIALS AND DEVICES XIII
(2022)
Article
Chemistry, Inorganic & Nuclear
Michele Segantini, Gianluca Marcozzi, Denis Djekic, Anh Chu, Daniel Amkreutz, Cham Thi Trinh, Sebastian Neubert, Bernd Stannowski, Kerstin Jacob, Ivo Rudolph, Joseph E. McPeak, Jens Anders, Boris Naydenov, Klaus Lips
Summary: Electrically detected magnetic resonance (EDMR) is a spectroscopic technique that measures variations in conductivity induced by spin-dependent processes to study materials’ physical properties. This study presents a single-board EPR spectrometer using a chip-integrated, voltage-controlled oscillator (VCO) array as a planar microwave source, optimized for EDMR experiments. The experiments successfully detected recombination current in a thin-film solar cell, serving as a proof of concept for in situ and operando EDMR investigations.
Article
Nanoscience & Nanotechnology
Bhaskar Das, Syed Minhaz Hossain, Ashit Kumar Pramanick, Arjun Dey, Mallar Ray
ACS APPLIED MATERIALS & INTERFACES
(2019)
Article
Chemistry, Physical
Hyun Deog Yoo, Jocob R. Jokisaari, Young-Sang Yu, Bob Jin Kwon, Linhua Hu, Soojeong Kim, Sang-Don Han, Mario Loyez, Saul H. Lapidus, Gene M. Nolis, Brian J. Ingram, Igor Bolotin, Shabbir Ahmed, Robert F. Klie, John T. Vaughey, Timothy T. Fister, Jordi Cabana
ACS ENERGY LETTERS
(2019)
Article
Physics, Applied
Sudipta Chakrabarty, Gourab Das, Mallar Ray, Syed Minhaz Hossain
JOURNAL OF APPLIED PHYSICS
(2020)
Article
Nuclear Science & Technology
J. Vacik, P. Horak, S. Bakardjieva, V. Bejsovec, G. Ceccio, A. Cannavo, A. Torrisi, V. Lavrentiev, R. Klie
RADIATION EFFECTS AND DEFECTS IN SOLIDS
(2020)
Article
Engineering, Electrical & Electronic
Bhaskar Das, Syed Minhaz Hossain, Bholanath Pakhira, Ashit Kumar Pramanick, Rahul Das, Mallar Ray
SEMICONDUCTOR SCIENCE AND TECHNOLOGY
(2020)
Article
Chemistry, Multidisciplinary
Arpita Jana, Duncan H. Gregory
CHEMISTRY-A EUROPEAN JOURNAL
(2020)
Article
Instruments & Instrumentation
P. Horak, S. Bakardjieva, J. Vacik, X. Rui, R. Klie
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
(2020)
Article
Materials Science, Coatings & Films
S. Bakardjieva, P. Horak, J. Vacik, A. Cannavo, V. Lavrentiev, A. Torrisi, A. Michalcova, R. Klie, X. Rui, L. Calcagno, Jiri Nemecek, G. Ceccio
SURFACE & COATINGS TECHNOLOGY
(2020)
Article
Automation & Control Systems
Tuhin S. Basu, Suman Maiti, Chandan Chakraborty
Summary: This article introduces a hybrid modular multilevel converter (HMMC) for large-scale PV integration, utilizing a distributed maximum power point tracking (D-MPPT) method to extract maximum power from PV panels. The use of zero sequence voltage (ZSV) injection is implemented to address power unbalance issues during partial shading, and the proposed control method is validated through simulation and experimental testing.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2021)
Article
Materials Science, Coatings & Films
Snejana Bakardjieva, Giovanni Ceccio, Jiri Vacik, Lucia Calcagno, Antonino Cannavo, Pavel Horak, Vasily Lavrentiev, Jiri Nemecek, Alena Michalcova, Robert Klie
Summary: This study investigates the structure and mechanical properties of Ti3InC2 thin nanocrystalline films produced by ion beam sputtering and irradiation, revealing that the structure and chemical composition remain intact at lower irradiation fluences but show significant morphological instability at higher fluences. The research suggests potential applications in extreme environments, such as nuclear facilities, but emphasizes the need for further study on the synthesis of high-quality, dense, and homogeneous Ti3InC2 thin nanocrystalline films.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Nuclear Science & Technology
J. Vacik, S. Bakardjieva, P. Horak, A. Cannavo, G. Ceccio, V Lavrentiev, D. Fink, J. Plocek, J. Kupcik, L. Calcagno, R. Klie
Summary: Self-organization is a phenomenon that occurs under certain conditions with various materials, including liquids, solids, and thin films. Bombardment with high-energy ions can lead to rearrangement of the original structure and formation of new nanostructures, which may have significant implications for the technology of new materials.
RADIATION EFFECTS AND DEFECTS IN SOLIDS
(2021)
Article
Engineering, Electrical & Electronic
Abu Bakar Siddique, Kelly Morrison, Guru Venkat, Ashit Kumar Pramanick, Niladri Banerjee, Mallar Ray
Summary: Nitrogen-functionalized graphene quantum dots embedded in a polyaniline matrix show promising potential for the development of next-generation sensors and thermoelectric materials. The study reveals distinct regimes of conduction at different temperatures, with a significant enhancement in conductivity for NGQD-doped samples and tunability of crossover temperature between different regimes by controlling voltage bias and doping. This work provides a framework to understand the interplay of extrinsic parameters like temperature and voltage bias with intrinsic material properties like doping in driving the electronic properties of these hybrid systems.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Tuhin Shuvra Basu, Simon Diesch, Ryoma Hayakawa, Yutaka Wakayama, Elke Scheer
Summary: The study investigated the modified electronic structure and single-carrier transport of individual hybrid core-shell metal-semiconductor Au-ZnS quantum dots using a scanning tunnelling microscope. The evolution of energy structure and charge transport from the metallic building block core to the core-shell metal-semiconductor QDs was revealed. The findings highlight the potential for fabricating tailored metal-semiconductor QDs for single-electron devices.
Article
Engineering, Electrical & Electronic
Tuhin Shuvra Basu, Yutaka Wakayama, Ryoma Hayakawa
Summary: This study provides a theoretical insight into the quantum transport of C-60 molecules in a vertical transistor, revealing that tunnel transport followed an orthodox theory widely used for single-carrier transport. The simulated drain current-drain voltage curves well reproduced experimental data, with intervals of the dI(d)/dV(d) peaks derived from degenerate molecular orbitals coinciding with the charging energy of single or a few C-60 molecules. These results confirm that the transport can be interpreted as single-carrier tunneling with interplay between a Coulomb blockade and discrete molecular orbitals, and the temperature dependence of the transport is intrinsic behavior caused by the quantum confinement effect in the molecules.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Tadas Paulauskas, Fatih G. Sen, Ce Sun, Paolo Longo, Yuan Zhang, Saw Wai Hla, Maria K. Y. Chan, Moon J. Kim, Robert F. Klie
