Article
Materials Science, Multidisciplinary
Monika Monica, Reena Reena, Sukhjeet Singh, Suhaas Gupta, Stuti Tomar, Ravi Kant Choubey, S. Gaurav, Tejendra K. Gupta, Dimple Kumari, Sunil Kumar
Summary: In this study, time-resolved photoluminescent emission decay curves were simulated for different nanophosphors and their dependence on various parameters was investigated. The results show that the excited state lifetime is affected by factors such as dopant concentration and nanocomposite composition.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Chemistry, Physical
Bingjie Zhong, Chengyang Zuo, Chao Yang, Shilin Yang, Yun Li, Hongtao Yu, Xianhua Wei
Summary: Rare-earth ion Eu3+ was doped into SrTiO3 ceramic to enhance its dielectric energy storage properties and act as luminescence centres. The doped ceramic exhibited higher breakdown strength and recoverable energy density compared to the undoped sample, with improvements of about 22% and 58%, respectively. In addition, the europium-doped ceramic capacitor demonstrated excellent power density and characteristic red photoluminescence.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Engineering, Electrical & Electronic
Seref Kalem
Summary: Black silicon (b-Si) with its promising optical, electronic and structural properties has attracted great attention for a wide range of applications. In this study, a technique involving thermal oxidation, photoresist coating, and chlorine plasma etching was used to produce b-Si and investigate its radiative recombination dynamics. The results showed the presence of a no-phonon radiative recombination component competing with non-radiative recombination at surface defects. The emission exhibited two decay processes with a peak energy at around 480 nm, a fast component of about 15 ps, and a lifetime component of around 50 ps, as well as a slow process in the red spectral region with a time constant of 1500 ps.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Physical
Fang- Lai, Jui-Fu Yang, Wei-Chun Chen, Dan-Hua Hsieh, Woei-Tyng Lin, Yu-Chao Hsu, Shou-Yi Kuo
Summary: This study investigates the optical properties and carrier dynamics of n-type wurtzite InN with different surface dimensions using photoluminescence and time-resolved photoluminescence analysis. The morphology of InN can be controlled by growth temperature, leading to variations in carrier concentration and emission peak energies. The increase in carrier concentration in InN samples with 2D features is attributed to the presence of donor-like nitrogen vacancies, while the higher emission peak energies are explained by the recombination of Mahan excitons and localized holes in different dimensional structures.
Article
Chemistry, Multidisciplinary
Ronghua Li, Tsuyoshi Takata, Beibei Zhang, Chao Feng, Qianbao Wu, Chunhua Cui, Zemin Zhang, Kazunari Domen, Yanbo Li
Summary: In this study, efficient photocatalytic water splitting criteria were revealed using SrTiO3: Al as a model photocatalyst, showing that suppressing photocarrier recombination and establishing a facile charge separation and extraction mechanism can achieve high quantum efficiency. Even on photocatalysts with a very short intrinsic photocarrier lifetime, high quantum efficiency can be achieved by challenging the belief that a long carrier lifetime is a fundamental requirement. These findings could guide the design of more efficient solar-to-fuel conversion OWS photocatalysts.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Nanoscience & Nanotechnology
Carolina de Passos, M. Dolores Merchan, M. Mercedes Velazquez
Summary: In this study, we investigated N-doped carbon nanoparticles (NCNPs) obtained through the hydrothermal treatment of graphene oxide (GO) and urea. We identified four emissive centers and found linear correlations between charge-transfer and n ->π* emissions with the percentage of pyrrolic and pyridinic N-groups.
JOURNAL OF SCIENCE-ADVANCED MATERIALS AND DEVICES
(2022)
Article
Chemistry, Physical
Fang Yao, Ruiming Li, Zhenglin Jia, Songxue Bai, Yujie Yang, Yanyan Li, Yalun Xu, Guojia Fang, Qianqian Lin
Summary: Chalcogenide-based semiconductors are highly promising for optoelectronic devices due to their low toxicity, cost-effectiveness, stability, and tunable properties. However, limited understanding of charge recombination mechanisms and trap states hinders their development. A comprehensive study on bismuth-based chalcogenide thin films was conducted to investigate the influence of post-treatments. The key findings were that post-treatment with Bi enhanced crystallinity and mobility but also increased carrier density, while post-treatment with sulfur increased carrier lifetime and mobility by passivating trap states.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Sofiia Kosar, Andrew J. Winchester, Tiarnan A. S. Doherty, Stuart Macpherson, Christopher E. Petoukhoff, Kyle Frohna, Miguel Anaya, Nicholas S. Chan, Julien Madeo, Michael K. L. Man, Samuel D. Stranks, Keshav M. Dani
Summary: Hybrid perovskite solar cells show promise as next generation, low-cost photovoltaic technologies, but nanoscale defect clusters formed during fabrication are critical to device efficiency and stability. Research has identified different types of defect clusters and their impact on device performance, as well as the varied response of defects to passivation strategies. Tailored multi-pronged approaches are needed to selectively address the detrimental impact of different defect types in hybrid perovskite solar cells.
ENERGY & ENVIRONMENTAL SCIENCE
(2021)
Article
Chemistry, Physical
Long Wang, Luke Wang, Kaixin Zhao, Danhui Cheng, Wenhao Yu, Jiayu Li, Jing Wang, Feng Shi
Summary: An efficient visible light responsive photocatalyst Ce/N co-doped SrTiO3 was prepared via a hydrothermal method and characterized for its properties. Ce/N co-doped SrTiO3 exhibited a more intense photocurrent response and lower surface resistance compared to N-SrTiO3 and Ce-SrTiO3. The water splitting rate of Ce/N-co-doped SrTiO3 was 84.49 times higher than that of pure SrTiO3.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Multidisciplinary
Stephen A. Lee, Christopher T. Kuhs, Emily K. Searles, Henry O. Everitt, Christy F. Landes, Stephan Link
Summary: In this study, time-resolved emission upconversion microscopy was used to investigate the lifetime and energy-dependent cooling of d-band holes formed in gold nanoparticles by plasmon excitation and decay.
Article
Materials Science, Ceramics
Devarajulu Gelija, B. Kiran Kumar, P. Reddi Babu, Yuwaraj K. Kshetri, Tae-Ho Kim, B. Deva Prasad Raju, Moon-Deock Kim
Summary: A series of Eu3+ and Eu3+/Gd3+ co-doped barium-bismuth-borate (Ba-Bi-B) glasses were prepared and their physical, structural, and spectroscopic properties were investigated. The energy transfer process from Gd3+ to Eu3+ ions was explored. The Ba-Bi-B glasses showed potential for display device applications based on the characteristics of photoluminescence under different excitation wavelengths.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Lifeng Wang, Dongmei Xiang, Kaimin Gao, Junhui Wang, Kaifeng Wu
Summary: Colloidal n-doped CdSe and CdSe/ZnS nanoplatelets have been achieved through a photochemical doping method, demonstrating successful additional electron doping at the conduction band edge. The key to successful doping lies in a high surface ligand coverage, while unpassivated surface cations may lead to depletion of the doped electrons.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Review
Chemistry, Physical
Weijian Chen, Zhixing Gan, Martin A. Green, Baohua Jia, Xiaoming Wen
Summary: This review discusses the mobile ion dynamics in halide perovskites investigated via luminescence spectroscopy combined with confocal microscopy, including mobile ion induced fluorescence quenching, phase segregation in mixed halide hybrid perovskite, and mobile ion accumulation at the interface in perovskite devices. Steady-state and time-resolved luminescence imaging techniques, combined with confocal microscopy, are unique tools for probing ionic dynamics in perovskites, providing invaluable insights on ionic dynamics in nanoscale resolution.
Article
Materials Science, Multidisciplinary
Shabnam Dadgostar, Jose Luis Pura Ruiz, Jorge Serrano Gutierrez, Bruno Lepine, Philippe Schieffer, Juan Jimenez
Summary: The luminescence of SrTiO3 is influenced by factors such as sample type, excitation conditions, and temperature, with the role of different defects on emissions still under debate. Studying undoped and Nb-doped samples through cathodoluminescence and photoluminescence can distinguish emission from bulk and surface regions, revealing the importance of surface defects and doped electrons in luminescence.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2022)
Article
Materials Science, Ceramics
Huimin Liu, Kezhi Li, Xin Zhang, Bing Liu, Lehua Qi, Xuemin Yin
Summary: Tapered nitrogen-doped SiC nanowires were grown vertically on carbon cloth using Si, SiO2, C, and dicyandiamide powders as raw materials via Fe-assisted chemical vapor deposition. The nanowires exhibited a high-density tapered morphology with increasing diameter from 120 nm to 1.30 μm and lengths of up to tens of micrometers. They were identified as 2H/3C-SiC mixed crystals and the tapered shape was influenced by the catalyst droplet, suggesting a Fe-assisted VLS mechanism. The PL spectrum showed a blue shift at 474 nm due to the special shape, defects, heterostructure, and quantum confinement effect of the nanowires.
CERAMICS INTERNATIONAL
(2023)
Article
Psychology, Educational
Italo Testa, Raffaele De Luca Picione, Umberto Scotti di Uccio
Summary: This study analyzed Italian high school and university students' attitudes towards physics using the Semiotic Cultural Psychological Theory (SCPT), finding four generalized meanings of physics that were significantly correlated with students' choices of studying physics at undergraduate level and participating in physics-related activities in high school. Implications for research are also discussed.
EUROPEAN JOURNAL OF PSYCHOLOGY OF EDUCATION
(2022)
Article
Physics, Multidisciplinary
Francesco Di Colandrea, Alessio D'Errico, Maria Maffei, Hannah M. Price, Maciej Lewenstein, Lorenzo Marrucci, Filippo Cardano, Alexandre Dauphin, Pietro Massignan
Summary: This paper investigates the analogy between the topological properties of Hofstadter Hamiltonians and the diffraction figures resulting from optical gratings. By establishing a one-to-one relation between Diophantine equations and the Bragg condition, the influence of structural disorder on the robustness of diffraction figures in optical gratings is discussed, which can be analogous to the robustness of transverse conductance in the quantum Hall effect.
NEW JOURNAL OF PHYSICS
(2022)
Article
Multidisciplinary Sciences
Raouf Barboza, Amin Babazadeh, Lorenzo Marrucci, Filippo Cardano, Corrado de Lisio, Vincenzo D'Ambrosio
Summary: The authors introduce a new optical encoding technique called linear photonic gears, which enables ultra-sensitive measurements of transverse displacements by mapping them into the polarization rotation of a laser beam. They argue that a resolution of 50 pm should be achievable with existing state-of-the-art technologies.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Yong Hu, Xianxin Wu, Brenden R. Ortiz, Sailong Ju, Xinloong Han, Junzhang Ma, Nicholas C. Plumb, Milan Radovic, Ronny Thomale, Stephen D. Wilson, Andreas P. Schnyder, Ming Shi
Summary: Enhanced correlation effects due to multiple van Hove singularities (VHS) in the vicinity of the Fermi level are predicted in the recently discovered AV(3)Sb(5) kagome metals. This study identifies three VHSs with diverse sublattice characters in CsV3Sb5, and reveals the flat dispersion of one VHS, suggesting its higher-order nature. The insights into the electronic structure provided by this work serve as a solid starting point for understanding the intriguing correlation phenomena in the kagome metals AV(3)Sb(5).
NATURE COMMUNICATIONS
(2022)
Article
Quantum Science & Technology
Chiara Esposito, Mariana R. Barros, Andres Duran Hernandez, Gonzalo Carvacho, Francesco Di Colandrea, Raouf Barboza, Filippo Cardano, Nicolo Spagnolo, Lorenzo Marrucci, Fabio Sciarrino
Summary: In this paper, we report the discrete-time quantum walk of two correlated photons in a two-dimensional lattice. The lattice is synthetically engineered by manipulating optical modes and mode-coupling is introduced via diffractive action of optical elements. The platform is compact, efficient, and scalable, making it a versatile tool for simulating quantum evolutions on complex lattices.
NPJ QUANTUM INFORMATION
(2022)
Article
Materials Science, Multidisciplinary
R. Di Capua, M. Verma, M. Radovic, V. N. Strocov, C. Piamonteze, E. B. Guedes, N. C. Plumb, Yu Chen, M. D'Antuono, G. M. De Luca, E. Di Gennaro, D. Stornaiuolo, D. Preziosi, B. Jouault, F. Miletto Granozio, A. Sambri, R. Pentcheva, G. Ghiringhelli, M. Salluzzo
Summary: This study investigates the multi-orbital physics in quasi-two-dimensional electron gases (q2DEGs). The filling of titanium-bands in the EuTiO3 layer and at the interface with SrTiO3 induces a switching of the exchange interaction between Eu-4f(7) magnetic moments. The results explain the observed ferromagnetic correlations and anomalous Hall effect in this q2DEG.
NPJ QUANTUM MATERIALS
(2022)
Article
Physics, Multidisciplinary
Flavio Giorgianni, Mattia Udina, Tommaso Cea, Eugenio Paris, Marco Caputo, Milan Radovic, Larissa Boie, Joe Sakai, Christof W. Schneider, Steven Lee Johnson
Summary: This study demonstrates a new pathway for optically controlling Raman-active modes in a strongly-correlated metal through a terahertz field-driven nonlinear process.
COMMUNICATIONS PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Ricci Erlandsen, Rasmus Tindal Dahm, Felix Trier, Mario Scuderi, Emiliano Di Gennaro, Alessia Sambri, Charline Kaisa Reffeldt Kirchert, Nini Pryds, Fabio Miletto Granozio, Thomas Sand Jespersen
Summary: This study reports the fabrication of freestanding oxide membranes with metallic conductivity and superconducting phases, which can be used to form devices on silicon substrates, indicating the potential for integrating oxide nanoelectronics with silicon-based architectures.
Article
Biochemistry & Molecular Biology
Rohit Kumar, Melania Paturzo, Angela Sardo, Ida Orefice, Yu Qiucheng, Andrea Rubano, Domenico Paparo
Summary: The global marine environment is being increasingly affected by human activities leading to climate change, eutrophication, and pollution. These factors impact the metabolic mechanisms of phytoplankton like diatoms. Heavy metals, among other pollutants, can significantly affect diatom viability. Understanding the interaction between diatoms and metals is crucial for both fundamental and applied purposes. Terahertz time-domain spectroscopy is evaluated as a method for sensing diatoms in aqueous systems resembling their natural environment. Despite the strong absorption of terahertz radiation in water, diatoms can still be detected by the enhancement of water absorption in the terahertz range caused by the water-diatom interaction. The addition of metal dopants affects this absorption enhancement, enabling the use of terahertz spectroscopy to monitor the toxic effects of metals on diatoms. This technique is shown to detect the harmful effects of heavy metals earlier than conventional methods like microscopy and molecular analyses.
Article
Multidisciplinary Sciences
Bruno Piccirillo, Domenico Paparo, Andrea Rubano, Antonello Andreone, Marcello Rossetti Conti, Dario Giove, Veronica Vicuna-Hernandez, Can Koral, Maria Rosaria Masullo, Giovanni Mettivier, Michele Opromolla, Gianpaolo Papari, Andrea Passarelli, Giuseppe Pesce, Vittoria Petrillo, Ester Piedipalumbo, Marcel Ruijter, Paolo Russo, Luca Serafini
Summary: In this work, a liquid crystal-based modular and extendable platform is proposed for studying materials by analyzing polarization and wavefront of light. This platform will be driven by the future THz-FEL source TerRa@BriXSinO, which produces high power radiation in the THz-range. Liquid crystal-based geometric phase components have been fabricated to optimize the source's potential for accurately determining polarization- and wavefront-sensitive properties of materials. This platform allows characterizing various properties of materials and can add orbital angular momentum for investigating chiral agents' properties using nonlinear optics techniques.
Article
Chemistry, Multidisciplinary
Hang Li, Walber H. Brito, Eduardo B. Guedes, Alla Chikina, Rasmus T. Dahm, Dennis V. Christensen, Shinhee Yun, Francesco M. Chiabrera, Nicholas C. Plumb, Ming Shi, Nini Pryds, Milan Radovic
Summary: Relatively simple surface preparation can reconstruct the 2D electron gas (2DEG) at the SrTiO3 surface, leading to a Lifshitz-like transition. Experimental methods combined with ab initio calculations reveal that the modulation of the surface band structures can be achieved via transforming the chemical composition at the atomic scale. Additionally, ARPES experiments demonstrate that vacuum ultraviolet light can effectively alter the band renormalization of the 2DEG system and control the electron-phonon interaction.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Optics
Andrea Rubano, Domenico Paparo
Summary: The photo-induced charge dynamics of ZnO, a wide-bandgap semiconductor, were studied on the picosecond time-scale. Optical Pump-THz Probe experiments were conducted to measure the dielectric constant of the material after high-fluence photo-excitation. This technique provided information on carrier lifetime, scattering rates, and changes in dielectric function upon excitation. In the high-fluence pumping regime, a complex dynamic was observed with relaxation time increasing with Pump fluence and photoconductivity onset occurring in a few picoseconds. The dependence of plasma frequency and relaxation time on Pump fluence was discussed.
Article
Engineering, Electrical & Electronic
Qiucheng Yu, Rohit Kumar, Deepak Kumar, Alessia Sambri, Fabio Miletto Granozio, Ignasi Fina, Florencio Sanchez, Domenico Paparo, Andrea Rubano
Summary: This study analyzes the interface-induced second-harmonic generation from ferroelectric hafnium-zirconium oxide thin films and finds that the signal mainly comes from the buffer side of the interface. Meanwhile, the ferroelectric film significantly affects the nonlinear optical properties of the underlying ferromagnetic buffer electrode. Possible mechanisms include oxygen migration, electrostatic effects, and modulation of the La0.67Sr0.33MnO3 magnetization by the upper ferroelectric film.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
J-Z Ma, S-N Zhang, J. P. Song, Q-S Wu, S. A. Ekahana, M. Naamneh, M. Radovic, V. N. Strocov, S-Y Gao, T. Qian, H. Ding, K. He, K. Manna, C. Felser, N. C. Plumb, O. Yazyev, Y-M Xiong, M. Shi
Summary: In this work, the authors combine angle-resolved photoemission spectroscopy with density-functional theory calculations to reveal a charged Weyl nodal surface with a giant Chern number in a chiral crystal. Unlike conventional Weyl nodes, this cube-shaped nodal surface in A1Pt is supported by nonsymmorphic chiral symmetries and time-reversal symmetry rather than accidental band crossings. Furthermore, the researchers demonstrate that there is no upper limit for the Chern numbers of such 2D Weyl nodal objects.
