Article
Chemistry, Physical
H. Joshi, R. K. Thapa, Amel Laref, Worasak Sukkabot, Lalrinthara Pachuau, Lalmuanpuia Vanchhawng, P. Grima-Gallardo, M. Musa H-E Saad, D. P. Rai
Summary: First Principles calculations were performed on CsPbBr3 to investigate its elastic, electronic and optoelectronic properties. The results show that the calculated energy bandgap is similar to experimentally measured values and the optical spectra exhibit high absorption coefficients in the range of 3-6 eV.
SURFACES AND INTERFACES
(2022)
Article
Materials Science, Ceramics
Z. M. H. El-Qahtani, Medhat A. El-Hadek, Maged F. Alotaibi, P. Petkov, A. M. Adam
Summary: Thin layers of Bi2-chalcogenides were evaporated on glass substrates using vacuum thermal evaporation, and their properties were enhanced through annealing. The crystal size increased while micro-strain and dislocation density decreased. Annealing also resulted in notable changes in optical band gap and transmittance.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
P. B. de Sousa, A. F. Gouveia, J. C. Sczancoski, I. C. Nogueira, E. Longo, M. A. San-Miguel, L. S. Cavalcante
Summary: The study reports the electronic structure, optical, and sonophotocatalytic properties of calcium tungstate (CaWO4) microcrystals synthesized by the sonochemical method. The theoretical calculations confirmed the decrease in optical band gap energy for defect-based structures, and the electron density maps indicated the presence of structural defects inducing a polarization phenomenon and inhomogeneous distribution of electron charge.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Electrical & Electronic
Lav Kush, Sanjay Srivastava, C. Sasikumar, Sanjay Kumar Vajpai, Yogesh Srivastava, Yash Jaiswal
Summary: This research focuses on the synthesis, characterization, and low temperature thermoelectric characteristics of La2-xPrxFeCoO6 double perovskite. The results show that with increasing Pr concentration, the crystallite size increases and the bandgap decreases, leading to increased conductivity, power factor, and figure of merit. The LaPrFeCoO6 compound exhibits the highest figure of merit at 300K.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Physics, Applied
Lung-Chien Chen, You-Siang Wei, Meng Zhang
Summary: We used MAPbBr(3) quantum dots and MABr salt as buffer layers to enhance the optoelectronic characteristics of CsPbBr3 perovskite light-emitting diodes (PeLEDs). The MAPbBr(3) QDs were prepared using a ligand-assisted reprecipitation method and bulk single crystals as the source material. The purified bc-MAPbBr(3) QDs and MABr salt were incorporated into the PeLED structures. The best brightness achieved was 7555 cd m(-2), and the external quantum efficiency reached 0.318%.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Chemistry, Physical
Siddhi Vinayak Pandey, Darshan Kumar Purohit, Abul Kalam, Seckin Akin, Soumitra Satapathi, Daniel Prochowicz, Pankaj Yadav
Summary: Metal halide perovskite single crystals (MHPSCs) have excellent optical and electrical properties, making them promising for solar cells and photodetectors. This study investigates the resistive effects and switching behavior of MAPbBr3 single crystals, aiming to fill the knowledge gaps and provide insights for memristor device development. The findings reveal the relationship between resistance and applied bias, leading to better understanding and optimization of MHPSC-based devices.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Mayank Jaiswal, Geetanjali Srivastava, Sonam Mishra, Praveen Kumar Singh, Ravindra Dhar, Roman Dabrowski
Summary: The green synthesis of copper oxide nanoparticles (CuO NPs) was successfully achieved using a biological, eco-friendly, and cost-effective method without requiring an inert atmosphere. The synthesized CuO NPs were characterized and confirmed to have a size of 2-3 nm through X-ray diffraction, ultraviolet-visible spectroscopy, and Fourier transform infrared spectroscopy techniques. Two different weight percentages (0.2 and 0.5) of the CuO NPs were dispersed in a liquid crystalline material (4-pentyl-4'-cyanobiphenyl, 5CB), and the physical properties of the pure 5CB and its nanocomposites were studied. The results showed enhancements in the nematic-isotropic transition temperature and conductivity, as well as a decrease in the optical band gaps of the dispersed samples.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Nanoscience & Nanotechnology
Daniel B. Straus, Robert J. Cava
Summary: By using solid-state synthesis, the band gap of halide perovskite CsPbBr3 can be continuously widened through homovalent substitution, allowing its optical properties to be tailored for absorptive and emissive applications.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Zheni N. Georgieva, Zhendian Zhang, Peng Zhang, Brian P. Bloom, David N. Beratan, David H. Waldeck
Summary: In this study, chiral methylammonium lead halide perovskite nanoplatelets (NPLs) were prepared with varied halide and ligand compositions. The relationship between the chiroptical properties and the ratio of chiral phenylethylammonium (PEA) to achiral octylamine (OA) ligands on the NPL surface was investigated. The study found that the saturation of induced chirality depends on the size of the perovskite exciton relative to the size of the ligand molecules. Temperature-dependent studies showed that the CD intensity and sign strongly depend on the ligand structure and orientation.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Physics, Applied
Chao Chen, Chong Qiao, Ming Xu, Xiangshui Miao
Summary: The dielectric properties of amorphous Ge8Sb2Te11 thin films were systematically investigated in this study. It was found that the static dielectric constant increased linearly with temperature, while showing little dependence on frequency. Moreover, the calculated bandgap was larger than that measured from optical absorption.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Mengnan Yao, Jizhong Jiang, Deyu Xin, Yao Ma, Wei Wei, Xiaojia Zheng, Liang Shen
Summary: Organolead trihalide perovskite single crystals offer unprecedented opportunity for X-ray and visible light detection, and formamidinium lead bromide single crystals are developed to address the challenge of maintaining high-performance and stability at high temperatures. These crystals demonstrate excellent performance as radiation detectors with low X-ray dose rate and high detectivity, as well as stability as photodetectors at high temperatures. The development of these bifunctional detectors could pave the way for stable detection in extreme space environments.
Article
Chemistry, Multidisciplinary
Chao Wu, Guangfeng Wei, Xingxing Jiang, Qinke Xu, Zheshuai Lin, Zhipeng Huang, Mark G. Humphrey, Chi Zhang
Summary: The synthesis of noncentrosymmetric (NCS) solids has always been a major challenge. This study demonstrates that the addition of Li2CO3 triggers the formation of an NCS precursor and plays a crucial role in the successful polymorphism transformation. The resulting β-Sc(IO3)3 crystal exhibits promising potential for mid-infrared NLO devices, with strong second-harmonic generation responses, a large optical band gap, sufficient birefringence, and wide optical transparency, which are induced by the optimal alignment of iodate anions. This study reveals the importance of additives in the growth of polar NCS solids and has implications for the strategic design of new NCS polymorphism materials with exceptional NLO properties.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Engineering, Electrical & Electronic
Abdessamad Najim, Bouchaib Hartiti, Hanan Absike, Herve Joel Tchognia Nkuissi, Hicham Labrim, Salah Fadili, Philippe Thevenin, Mehmet Ertugrul
Summary: This study investigated the influence of substitution of bromine (Br) with iodine (I) on the electronic structure and optical characteristics of cubic perovskite CsPbBr3-xIx. The results showed that the compounds exhibited properties of semiconducting materials and could be potential candidates for solar cell and optoelectronic applications.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2022)
Article
Chemistry, Multidisciplinary
Merve Taner Camci, Matthias Pauly, Christophe Lefevre, Corinne Bouillet, Mounir Maaloum, Gero Decher, David Martel
Summary: This study prepared thin deposits of aligned semiconducting titanium oxide and zinc oxide nanowires using grazing incidence spraying technique on transparent substrates. By measuring the transmittance of linearly polarized light, it was found that titanium oxide nanowires exhibit an orientation-dependent variation of the apparent optical band gap energy at room temperature (>100 meV), providing insights for the design of future optoelectronic devices.
Article
Physics, Condensed Matter
Sen Ming, Han Chen, Jing Huang, Minghao Li, Bin Wang, Jing Su
Summary: This paper investigates the composition, lattice structure, and optical properties of CsPbBr3/Cs4PbBr6 polycrystalline composites. The results show that the composites have a wide absorption range and green luminescence. The formation mechanism of the composites is also analyzed.
PHYSICA B-CONDENSED MATTER
(2022)
Article
Materials Science, Multidisciplinary
Giovanni Borgh, Corrado Bongiorno, Antonino La Magna, Giovanni Mannino, Alireza Shabani, Salvatore Patane, Jost Adam, Rosaria A. Puglisi
Summary: Surface plasmons (SP) arising from nanometer silicon objects have significant advantages in controlling and manipulating light at the nanoscale in various research areas. However, the plasmon mechanisms of silicon need to be thoroughly studied as they have not yet been fully understood and exploited. The influence of nanowire shape and the existence of physical constraints for surface plasmon excitation remain to be fully understood.
OPTICAL MATERIALS EXPRESS
(2023)
Article
Engineering, Electrical & Electronic
C. Spampinato, S. Valastro, E. Smecca, V. Arena, G. Mannino, A. La Magna, C. Corsaro, F. Neri, E. Fazio, A. Alberti
Summary: The use of nanostructured materials is increasingly widespread in various scientific applications. One of them is in the architecture of perovskite solar cells, which have high photoconversion efficiency values. TiO2 sponges were deposited using a reactive sputtering technique, resulting in a porous structure with uniform rods separated by mesopores. The change in wettability values of the TiO2 samples before and after thermal annealing treatment was investigated.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B
(2023)
Article
Chemistry, Multidisciplinary
Valentina Arena, Emanuele Smecca, Salvatore Valastro, Corrado Bongiorno, Giuseppe Fisicaro, Ioannis Deretzis, Carlo Spampinato, Giovanni Mannino, Sandro Dattilo, Andrea Antonino Scamporrino, Sabrina Carola Carroccio, Antonino La Magna, Alessandra Alberti
Summary: The importance of lead analysis in environmental matrices is increasing due to human-induced spread of toxic species in nature. A new dry approach for lead detection and measurement is proposed, which involves capturing lead from a liquid solution using a solid sponge and quantifying it through X-ray analyses. Gig-lox TiO2 layers with a branched multi-porosity spongy structure were used to capture lead atoms in a liquid environment. The method is based on the relationship between the electronic density of the solid sponge and the critical angle for total reflection of X-rays.
Article
Green & Sustainable Science & Technology
Salvatore Valastro, Emanuele Smecca, Giovanni Mannino, Corrado Bongiorno, Giuseppe Fisicaro, Stefan Goedecker, Valentina Arena, Carlo Spampinato, Ioannis Deretzis, Sandro Dattilo, Andrea Scamporrino, Sabrina Carroccio, Enza Fazio, Fortunato Neri, Francesco Bisconti, Aurora Rizzo, Corrado Spinella, Antonino La Magna, Alessandra Alberti
Summary: With the projected rapid growth of the market uptake of perovskite solar cells (PSCs), the use of this clean energy technology will play a crucial role in reducing the global carbon footprint. However, the presence of toxic lead (Pb) poses a major barrier to its full commercialization. Researchers have demonstrated that the application of a transparent titanium dioxide (TiO2) sponge can effectively prevent Pb leakage, leading to a more sustainable solution and accelerated practical applications.
NATURE SUSTAINABILITY
(2023)
Article
Engineering, Electrical & Electronic
Damiano Ricciarelli, Giovanni Mannino, Ioannis Deretzis, Gaetano Calogero, Giuseppe Fisicaro, Richard Daubriac, Fuccio Cristiano, Remi Demoulin, Pawel P. Michalowski, Pablo Acosta-Alba, Jean-Michel Hartmann, Sebastien Kerdiles, Antonino La Magna
Summary: Ultraviolet nanosecond laser annealing is a powerful tool for optimal heating and melting. The complexity of semiconductor integration schemes has increased the importance of this process. Reliable simulations of laser melting are necessary, especially for 3D nanostructured systems with various shapes and phases. In this study, the laser melting process of Si1-xGex alloys was simulated using a finite element method/phase field approach, highlighting the significance of reproducing the reflectivity of the material interface accurately.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2023)
Article
Energy & Fuels
Giovanni Mannino, Jesus Sanchez-Diaz, Emanuele Smecca, Salvatore Valastro, Ioannis Deretzis, Rafael S. Sanchez, Juan P. Martinez-Pastor, Ivan Mora-Sero, Alessandra Alberti
Summary: The most promising lead-free option for perovskite solar cells is tin halide perovskite materials. Spectroscopic ellipsometry is used to investigate the dielectric function of FASnI(3) layers with and without additives, revealing a decrease in absorption coefficient in the band gap region and an increase in absorption in the 3-4.5 eV region, suggesting the production of amorphous tin oxide. By adding sodium borohydride and dipropylammonium iodide, the optically active area is preserved and SnO2 production is prevented. Additionally, FASnI(3) is optically durable up to 100°C when additives are used.
Article
Chemistry, Multidisciplinary
Paola La Magna, Carlo Spampinato, Salvatore Valastro, Emanuele Smecca, Valentina Arena, Giovanni Mannino, Ioannis Deretzis, Giuseppe Fisicaro, Corrado Bongiorno, Alessandra Alberti
Summary: This study explores the potential of a blended material composed of CsPbI3:EuCl3 perovskite and Gig-Lox TiO2 for use in solar cells. The inclusion of EuCl3 in CsPbI3 stabilizes the desired gamma-phase, making it suitable for solar energy conversion. X-ray-based techniques and spectroscopic ellipsometry were used to investigate the structural properties and interfacial behavior of this blended material. The findings reveal a significant quenching of photoluminescence, highlighting the important role of distributed interfaces in facilitating efficient carrier injection.
