Article
Materials Science, Multidisciplinary
Zhihao Cao, Lei Liu, Feifei Lu, Hongchang Cheng, Xin Guo
Summary: With the rise of III-V semiconductor materials, there has been increased interest in InGaN materials. Nanowire arrays have the ability to trap light effectively and generate a large number of photogenerated electrons. However, the adjacent nanowires absorb these electrons twice, making it challenging to measure the emission performance accurately using quantum efficiency. In this study, we introduce the concept of collection efficiency to evaluate the photoemission performance of InGaN nanowire arrays under different conditions.
Article
Materials Science, Multidisciplinary
S. Azar Oliaei Motlagh, Vadym Apalkov
Summary: The interaction between graphene quantum dots (GQDs) and ultrashort strong optical pulses was studied theoretically. The absorbance of GQDs has a highly nonlinear dependence on the field amplitude, showing different relationships at small and large-field amplitudes. The absorbance also has a maximum value depending on the size of the dot as the field amplitude changes.
Article
Materials Science, Multidisciplinary
Zhihao Cao, Lei Liu, Feifei Lu, Hongchang Cheng, Xin Guo
Summary: With the rise of group III nitride semiconductor materials, InGaN provides a great possibility for manufacturing high performance photocathodes with wide spectral response. In order to reduce the secondary absorption of photoelectrons by adjacent nanocones and improve the collection efficiency, we established a field-assisted negative electron affinity potential InGaN nanocone array photocathode. We found that the external electric field can greatly improve the collection efficiency and electron collection ratio of the nanocone array, leading to a significant improvement compared with that without external electric field. Therefore, the study in this paper can provide a certain theoretical reference for the preparation and performance improvement of InGaN nanocone array photocathode.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
A. V. Zinovchuk, V. S. Slipokurov
Summary: This paper presents a modified empirical pseudopotential based method for calculating the electronic structure of InGaN/GaN quantum wells. The method describes the confining potential as a difference between the atomic potential of the constituent bulk material and a superposition of the potentials of the atoms forming the quantum well. By considering the atomistic formulation of the quantization problem, the method avoids approximations and includes the effects of random alloy fluctuations on the electronic states. Furthermore, the method maintains a high computational efficiency.
OPTICAL AND QUANTUM ELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Liwen Cheng, Zhenwei Li, Jiayi Zhang, Xingyu Lin, Da Yang, Haitao Chen, Shudong Wu, Shun Yao
Summary: An InGaN laser diode with InGaN-GaN-InGaN delta barriers demonstrates lower turn-on current, higher laser power, and higher slope efficiency compared to those with InGaN or conventional GaN barriers. These improvements are attributed to modified energy bands that enhance carrier injection within the active region.
Article
Physics, Multidisciplinary
Indrani Mazumder, Kashish Sapra, Avinash Paliwal, Ashok Chauhan, Manish Mathew, Kuldip Singh
Summary: In this paper, the effect of chirped barrier on the optical properties of InGaN/GaN and InGaN/InGaN multi quantum wells (MQWs) based light-emitting diodes is presented. The chirped barrier configuration leads to enhanced performance in terms of reduced leakage current, IQE droop, polarization charges at interfaces, increased Hole injection, better carrier distribution, and increased carrier wave function overlap. Among the four LED structures considered, the InGaN/InGaN chirped barrier configuration shows the best results. The IQE droop is reduced from 14 to 1%, and the carrier wave function overlap improves from 19 to 41%.
INDIAN JOURNAL OF PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Junmo Jeon, Se Kwon Kim, SungBin Lee
Summary: Magnonics is a technology that utilizes spin-wave excitations in ordered magnetic media to carry spin current. However, the finite lifetime of magnons due to magnon-magnon interactions hinders the efficient realization of magnonic devices. Researchers suggest using critical magnon modes in quasicrystals to overcome this issue, as critical magnons exhibit fractal characteristics and longer lifetimes compared to regular magnons.
Article
Chemistry, Physical
Qing-Yu Xie, Peng-Fei Liu, Jiang-Jiang Ma, Fang-Guang Kuang, Kai-Wang Zhang, Bao-Tian Wang
Summary: Monolayer SnI2 exhibits promising lattice thermal conductivity and electronic transport performance, contributing to its ultrahigh figure of merits and unique conductive properties as a potential thermoelectric material.
Article
Physics, Applied
Zhihao Cao, Lei Liu, Feifei Lu, Jian Tian, Xingyue Zhangyang, Zhidong Wang, Hongchang Cheng, Xin Guo
Summary: An external electric field-assisted method is proposed to enhance the electron collection capability of InGaN photocathode. The results demonstrate that the electron collection ability of nanowire array is improved with the assistance of an external electric field.
MODERN PHYSICS LETTERS B
(2023)
Article
Chemistry, Physical
Mingge Yang, Ziyue Wang, Jiangxiao Li, Bin Hong, Yinchang Du, Wensen Wei, Ruilong Wang, Fengguang Liu, Lin Zu
Summary: We report the structure, magnetic and electrical/thermal transport properties of the antiferromagnet MnSn2. The existence of two antiferromagnetic states below T-N2 (around 320 K) is confirmed by magnetism and electrical transport measurements. The results suggest that the spin arrangement plays a vital role in the magnetic, electrical, and thermal transport properties in MnSn2.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Najmeh Janatipour, Zabiollah Mahdavifar, Siamak Noorizadeh, Georg Schreckenbach
Summary: The electronic transport properties of a pristine C-6 chain and Si/B-substituted C-6 chains sandwiched between carbon nanotube electrodes were investigated. The study revealed that Si and B substitutions affect the I-V curve and result in multi negative differential resistance (NDR) and rectifying behavior. The asymmetric distribution of frontier molecular orbitals and their coupling with the electrodes were found to be responsible for the rectifying performance.
Article
Engineering, Electrical & Electronic
Evgeny Mikheev, Ilan T. Rosen, Johannes Kombe, Francois Damanet, Marc A. Kastner, David Goldhaber-Gordon
Summary: This study reports the challenges in exploring quantum effects in SrTiO3 nanostructures and proposes a highly mobile, gate-tunable, and nanoscale-wide device. The correlation properties of the two-dimensional electron gas channel suggest its significant potential in the field of superconductivity.
NATURE ELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Yu Liu, Myung-Geun Han, Yongbin Lee, Michael O. Ogunbunmi, Qianheng Du, Christie Nelson, Zhixiang Hu, Eli Stavitski, David Graf, Klaus Attenkofer, Svilen Bobev, Liqin Ke, Yimei Zhu, Cedomir Petrovic
Summary: This study reveals that localized electronic charge carriers in Cr2Ge2Te6 are influenced by the surrounding lattice and participate in polaronic transport, which is observed through hopping with specific magnetocrystalline anisotropy. This opens up the possibility of manipulating charge transport in Cr2Ge2Te6-based devices by utilizing electron-phonon and spin-orbit coupling to tailor polaron properties.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Physical
G. R. Berdiyorov, B. Mortazavi, H. Hamoudi
Summary: The study found that recently synthesized single layer BeN4 and dynamically stable MgN4, both new types of 2D Dirac materials, exhibit strongly anisotropic electronic transport. The current along the armchair direction is significantly larger than in the zig-zag direction, and replacing metal atoms in the materials can increase the conductivity.
Article
Physics, Applied
Yajun Zhang, Xu He, Philippe Ghosez
Summary: The observation of superconductivity in infinite-layer nickelates provides a new platform to explore superconducting mechanism. By comparing the magnetic properties of LaNiO2 with that of CaCuO2, the electronic origin of the quasi-2D antiferromagnetic state in LaNiO2 is revealed, showing strong resemblance to that of NdNiO2. This provides a solid theoretical basis to elucidate the origin of superconductivity in infinite-layer nickelates by establishing a direct connection with the cuprates from electron, orbital, and spin degrees of freedom.
APPLIED PHYSICS LETTERS
(2023)
Article
Nanoscience & Nanotechnology
Yurii A. Romaniuk, Sergii Golovynskyi, Alexander P. Litvinchuk, Dan Dong, Yan Lin, Oleksandr Datsenko, Matteo Bosi, Luca Seravalli, Ivan S. Babichuk, Volodymyr O. Yukhymchuk, Baikui Li, Junle Qu
Summary: This study experimentally and theoretically investigated the vibration frequency changes in monolayer and few-layer MoS2 crystals, showing a good agreement between experimental and theoretical results. The proposed method can be used to estimate the layer thickness of MoS2 and determine interaction parameters, as well as to analyze spectra of other 2D layered materials.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2022)
Article
Chemistry, Physical
Polat Narin, Ece Kutlu-Narin, Gokhan Atmaca, Beyza Sarikavak-Lisesivdin, Sefer B. Lisesivdin, Ekmel Ozbay
Summary: Metal-organic chemical vapor deposition (MOCVD) is a high-quality growth method for GaN-based materials. In this study, InAlN/GaN and AlN/GaN heterostructures were grown using MOCVD, and their structural and surface properties were characterized using X-ray diffraction and atomic force microscopy measurements.
SURFACE AND INTERFACE ANALYSIS
(2022)
Article
Materials Science, Multidisciplinary
Betul Sekertekin, Kenan Ozel, Abdullah Atilgan, Abdullah Yildiz
Summary: In this paper, a UV photodiode based on TiO2 nanorods has been successfully fabricated, showing superior UV detection capability. The presented fabrication approach can also be applied to other metal-oxide semiconductor optoelectronic devices.
Article
Nanoscience & Nanotechnology
Iqra Irfan, Sergii Golovynskyi, Oleg A. Yeshchenko, Matteo Bosi, Ting Zhou, Bin Xue, Baikui Li, Junle Qu, Luca Seravalli
Summary: This study investigates the enhancement of photoluminescence and Raman spectra in 2D MoS2 by decorating it with Au nanorods and nanospheres. The samples decorated with Au nanorods show the highest enhancement, which can be attributed to highly localized plasmonic hot spots.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2022)
Article
Chemistry, Multidisciplinary
Claudio Ferrari, Giovanni Attolini, Matteo Bosi, Cesare Frigeri, Paola Frigeri, Enos Gombia, Laura Lazzarini, Francesca Rossi, Luca Seravalli, Giovanna Trevisi, Riccardo Lolli, Lucrezia Aversa, Roberto Verucchi, Nahida Musayeva, Muhammad Alizade, Sevinj Quluzade, Teimur Orujov, Francesco Sansone, Laura Baldini, Francesco Rispoli
Summary: In this study, amino-functionalized carbon nanotubes were used to produce resistive sensors for detecting nitroaromatic explosives through their interaction with vapor. The sensors demonstrated simple construction, low power consumption, and potential for portable device preparation.
Article
Materials Science, Coatings & Films
A. Parisini, P. Mazzolini, O. Bierwagen, C. Borelli, K. Egbo, A. Sacchi, M. Bosi, L. Seravalli, A. Tahraoui, R. Fornari
Summary: SnO/ ε-Ga2O3 vertical p-n diodes with planar geometry have been fabricated and investigated. The in-plane conduction through the Si-doped ε-Ga2O3 layer significantly affects the performance of the diodes, showing typical features of variable range hopping transport.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2022)
Article
Optics
Polat Narin, Ece Kutlu-Narin, Senem Kayral, Remziye Tulek, Sibel Gokden, Ali Teke, Sefer Bora Lisesivdin
Summary: This study investigates the effects of growth temperatures, post-growth treatment, and substrate cleaning recipes on the properties of ZnO nanostructures grown using the mist Chemical Vapor Deposition method. The results show that the growth temperature and post-growth treatment strongly influence the structural, morphological, and luminescence properties of the ZnO nanostructures.
JOURNAL OF LUMINESCENCE
(2022)
Article
Chemistry, Multidisciplinary
Siriny Laumier, Thomas Farrow, Harm van Zalinge, Luca Seravalli, Matteo Bosi, Ian Sandall
Summary: This paper investigates the use of dielectrophoresis to align germanium nanowire arrays and create nanowire-based diodes for bio-sensing applications. The controllable and repeatable fabrication method of dielectrophoresis is established for germanium nanowires, and a series of diodes are formed using optimum process conditions. These functionalized diodes, which are able to specifically bind to the spike protein of SARS-Cov2, exhibit a linear increase in source to drain current with increasing spike protein concentration from 100 fM/L to 1 nM/L.
Article
Physics, Condensed Matter
Gulden Yildiz Senguler, Ece Kutlu Narin, Sefer Bora Lisesivdin, Tulay Serin
Summary: In this study, Cu2CoSnS4 (CCTS) films were grown using the sol-gel method and the effect of thiourea concentration on film properties was investigated. The results showed that increasing thiourea concentration affected the structure, optical, morphological, and electrical properties of the films.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Materials Science, Multidisciplinary
P. Narin, J. M. All Abbas, E. Kutlu-Narin, S. B. Lisesivdin, E. Ozbay
Summary: Monolayer Indium Selenide (ML-InSe) was studied for its 4x4 supercell structure using ab initio calculations. The electronic and optical properties of ML-InSe were calculated for both pristine and substitutionally doped ML-InSe with Pd, Pt, Ag, and Au atoms. Substitutional doping was found to induce a spin-dependent electronic structure in ML-InSe, with flat energy bands near the Fermi level when doping elements were placed in In site. The PDOS calculations revealed the formation of flat bands of d orbitals of some noble metal atoms. The energetically favorable position for doping atoms was determined to be the Pt-In substitution atom based on formation energy calculations. Bond length, static dielectric constant (epsilon(0)), refractive index, and energy band gap were calculated for each studied structure. In the ML-InSe structure with Au-Se, epsilon(0) reached approximately 8.15. Substitutional doping was also found to induce peaks in the lower energy region of the imaginary part of the dielectric function, which may have significance for the optoelectronic properties of ML-InSe.
COMPUTATIONAL MATERIALS SCIENCE
(2023)
Article
Physics, Condensed Matter
Tugce Han, Ece Kutlu-Narin, Polat Narin, Beyza Sarikavak-Lisesivdin, Sefer Bora Lisesivdin
Summary: This study investigates the effect of changing the acetic acid (AA) ratio in the precursor solution on the growth and physical properties of MgZnO structures. The results show that the (0002) diffraction peak is dominant in MgZnO grown with 25% and 50% AA ratio. The surface density of growing MgZnO decreases with an increased AA ratio. The optical properties, including absorbance, transmittance, and band gap, have been examined for MgZnO samples with different AA ratios.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Chemistry, Physical
Sergii Golovynskyi, Oleksandr I. Datsenko, Muhammad Usman, Ana I. Perez-Jimenez, Marc Chaigneau, Matteo Bosi, Luca Seravalli, Tarek Hidouri, Iuliia Golovynska, Baikui Li, Honglei Wu
Summary: A comprehensive study is conducted on multilayer PbI2 flakes, including their structure, chemical composition, morphology and photoluminescence (PL). The reduction of thickness leads to uneven spatial mapping of PL and Raman intensities, while the spectra positions and shapes remain unchanged. The most intense peaks in the PL spectra are the direct free exciton (FX) peak at 2.44 eV (508 nm) and the bound exciton (BX) peak at 2.41 eV (516 nm). Three more defect-related peaks at 2.35, 2.19 and 2.04 eV are discovered through above/below-bandgap excitation variation. The origins of these BX peaks are clarified through DFT calculations and experimental results.
APPLIED SURFACE SCIENCE
(2023)
Article
Crystallography
Benedetta Ghezzi, Giovanni Attolini, Matteo Bosi, Marco Negri, Paola Lagonegro, Pasquale M. Rotonda, Christine Cornelissen, Guido Maria Macaluso, Simone Lumetti, Ruikang Tang
Summary: This study investigates the wettability of cubic silicon-carbide-based (SiC) surfaces and identifies SiO2/SiC core-shell nanowires (NWs) as a highly wettable material suitable for biological applications. The biocompatibility of the NWs is confirmed through non-toxicity tests on murine fibroblasts, and the efficacy of the surfaces is demonstrated through a proliferation assay on murine osteoblasts. Hence, SiO2/SiC NWs hold potential for biomedical applications in tissue engineering.
Article
Chemistry, Physical
F. Esposito, M. Bosi, G. Attolini, F. Rossi, S. E. Panasci, P. Fiorenza, F. Giannazzo, F. Fabbri, L. Seravalli
Summary: The objective of this study was to compare MoS2 2-dimensional monolayer flakes grown by Chemical Vapour Deposition using different density gradients in the liquid precursors solution. The structures grown using glycerol showed a larger variability in the lateral size of the triangular structure with good crystalline quality, while structures grown using iodixanol exhibited poorer crystalline quality with nanometric pores and more homogeneous sizing of the triangular structures. The lower crystalline quality of iodixanol samples resulted in reduced light emission efficiency and lower mobility.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
L. Seravalli, F. Esposito, M. Bosi, L. Aversa, G. Trevisi, R. Verucchi, L. Lazzarini, F. Rossi, F. Fabbri
Summary: Strain engineering is an efficient tool for adjusting the electrical and optical properties of 2D materials. In this study, we found that the built-in strain in MoS2 monolayers grown on a SiO2/Si substrate is mainly dependent on the size of the monolayer. A critical size of 20 μm was identified, beyond which the built-in strain significantly increased. The maximum built-in strain was observed in a 60 μm sized monolayer, which resulted in 1.2% tensile strain with partial strain release near the triangular vertexes due to nanocrack formation. These findings suggest that the standard method for evaluating the number of layers based on Raman mode separation may be unreliable for highly strained monolayers with a lateral size above 20 μm.
Article
Physics, Condensed Matter
Shivani Gohri, Jaya Madan, Rahul Pandey
Summary: This study improves the efficiency of SnS-based solar cells by implementing the glancing angle deposition approach and introducing a CZTSSe layer. The findings offer valuable insights for enhancing the design of SnS-based solar cells and making them more efficient.
SOLID STATE COMMUNICATIONS
(2024)
Article
Physics, Condensed Matter
Mahboubeh Yeganeh, Davoud Vahedi Fakhrabad
Summary: The lattice thermal conductivity of CdO monolayer was investigated, and it was found to be lower than that of bulk CdO due to the lower phonon lifetime and phonon group velocity. As a result, the monolayer exhibits higher thermoelectric efficiency compared to the bulk counterpart.
SOLID STATE COMMUNICATIONS
(2024)
Article
Physics, Condensed Matter
Shivam Srivastava, Prachi Singh, Anjani K. Pandey, Chandra K. Dixit
Summary: In this research paper, a novel equation of state (EOS) based on finite strain theories is proposed for predicting the thermo elastic properties of various materials. Extensive analysis and comparison with existing models and experimental data demonstrate the validity and effectiveness of the proposed EOS in capturing the unique thermodynamic behavior of nanomaterials, bulk metallic glasses, and superconductors. This research is of great importance in the fields of materials science, nanotechnology, and condensed matter physics.
SOLID STATE COMMUNICATIONS
(2024)
Article
Physics, Condensed Matter
Subrata Das, Sanjoy Kr Mahatha, Konstantin Glazyrin, R. Ganesan, Suja Elizabeth, Tirthankar Chakraborty
Summary: In this study, we investigated the structural evolution of Tb2Ti2O7 under external pressure and temperature, and confirmed the occurrence of an isostructural phase transition beyond 10 GPa pressure. This transition leads to changes in lattice parameters and mechanical properties, which can be understood in terms of localized rearrangement of atoms.
SOLID STATE COMMUNICATIONS
(2024)
Article
Physics, Condensed Matter
Hamze Mousavi
Summary: It has been found that undoped graphene sheet has zero states at the Fermi energy level, making it difficult for Cooper pairing to occur in the superconductive state. However, T-graphene, with physical properties similar to graphene, exhibits metallic behavior and has available electron states near the Fermi level. The gap equation for the s-wave superconductive state is derived based on the attractive Hubbard model and the Bogoliubov de Gennes equation for this two-dimensional metallic system. It is found that a nonzero critical temperature, τ, exists for different levels of electron-electron interaction, ǫ. τ has higher values when the system has electronic half band-filling, but decreases when the system does not have half band-filling. However, τ vanishes when ǫ becomes small enough near the band edges.
SOLID STATE COMMUNICATIONS
(2024)
