Article
Materials Science, Multidisciplinary
Imen Cherif, Hanen Raissi, Khouloud Abiedh, Bouzid Gassoumi, Maria Teresa Caccamo, Salvatore Magazu, Ayoub Haj Said, Fredj Hassen, Taoufik Boubaker, Sahbi Ayachi
Summary: The reaction of 4-chloro-7-nitrobenzofurazan (NBD-chloride, NBD-Cl) with piperidine, a secondary amine, in acetonitrile results in the formation of the nucleophilic aromatic substitution product (NBDPip). The NBD-Pip was analyzed using stationary photoluminescence (cw-PL) and time-resolved photoluminescence (TR-PL) spectroscopy. The cw-PL spectrum shows intense peaks in the 700-750 nm range. The decay time decreases from 0.75 ns to 0.62 ns with increasing wavelength emission lambda Em at room temperature. The interaction between NBD and piperidine was studied using DFT calculations and various analysis techniques.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Energy & Fuels
Chen Yang, JingRui Qu, ZhenYu Wu
Summary: Flexible III-V compound thin film solar cells show great potential in various applications. Through theoretical, numerical and experimental methods, the mechanical reliability of GaAs thin film solar cells with polymer film encapsulation has been investigated. The study reveals different stages of stress failure and emphasizes the important role of interface stiffness mismatch in encapsulation failure.
Article
Chemistry, Multidisciplinary
Hyun Uk Chae, Bo Shrewsbury, Ragib Ahsan, Alok Ghanekar, Michelle L. Povinelli, Rehan Kapadia
Summary: This article proposes the use of metal-semiconductor-metal (MSM) structures to adjust the absorptivity of a metasurface at infrared wavelengths. It demonstrates the direct growth of single-crystalline InAs on metal to build tunable absorbers/emitters in the infrared regime. The growth method and device enable scalable and tunable infrared devices for various thermal-photonic applications.
Article
Materials Science, Multidisciplinary
Katsumi Yamada, Hidetoshi Miyazaki
Summary: Samarium (III) oxide (Sm2O3) nanoparticle-based composite films were successfully fabricated using samarium nitrate, ethanol, and UV-curable liquid urethane resin as starting materials. The films changed color from yellow to reddish orange after UV irradiation, with particle size in the range of 56-86 nm. The composite film exhibited photoluminescent properties, and some trivalent Sm3+ particles were reduced to divalent Sm2+ upon extended UV light irradiation.
Article
Nanoscience & Nanotechnology
Tuomas Haggren, Julie Tournet, Chennupati Jagadish, Hark Hoe Tan, Jani Oksanen
Summary: A scalable multilayer epitaxial lift-off process is demonstrated, which allows efficient removal of epitaxially grown materials from their host substrate without external strains. The films retain good integrity after lift-off and can be further processed into devices. Cost analysis shows a 4-to-6-fold reduction in cost compared to the single-layer epitaxial lift-off process, making it significant for III-V photovoltaics and other technologies relying on thin-film III-V semiconductors.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Kartika Maheshwari, A. S. Rao
Summary: Tb3+ doped BZLP glasses were prepared and extensively investigated for their potential use in visible photonic device applications. Spectroscopic techniques including XRD, UV-VIS absorption, and photoluminescence (PL) were employed to study the glass properties. The resulting glasses exhibited intense green emission and relatively weak emission in blue, yellow, and red regions. The PL intensity increased with the concentration of Tb3+ ions. The glasses showed a high thermal stability and suitability as a green emitter for visible photonic devices.
Article
Chemistry, Inorganic & Nuclear
Muhammad Sheraz Khan, Muhammad Ikram, Li-Jie Shi, Bingsuo Zou, Hamid Ullah, Muhammad Yar Khan
Summary: First-principles calculations were used to investigate the optoelectronic and magnetic properties of Ga1-xVxN, showing that V(III) doping affects the magnetic state and electronic structure of GaN. Super-exchange mechanism leads to ferromagnetic coupling between V(III) ions. Higher concentrations of V(III) ions may result in Curie temperatures above room temperature. Additionally, V(III) doping increases the fundamental bandgap of GaN and affects the d-d transition bands in the visible region of the absorption spectrum.
JOURNAL OF SOLID STATE CHEMISTRY
(2021)
Article
Engineering, Electrical & Electronic
Shinji Matsuo, Takuma Aihara, Tatsurou Hiraki, Yoshiho Maeda, Toshiki Kishi, Takuro Fujii, Koji Takeda, Takaaki Kakitsuka
Summary: Silicon photonics is a crucial technology for large-scale photonic integrated circuits due to its capability of high uniformity and quality wafer processes. This paper focuses on the heterogeneous integration of membrane III-V compound semiconductor photonic devices, which offer optical gain and high modulation efficiency. The use of a simple taper waveguide structure enables efficient optical coupling with a Si waveguide. Furthermore, the micro-transfer-printing technology allows for device selection and integration on Si substrates, facilitating the development of transmission modules with low power consumption.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2023)
Article
Chemistry, Physical
A. K. Tan, N. A. Hamzah, M. A. Ahmad, S. S. Ng, Z. Hassan
Summary: In this study, InGaN/GaN heterostructures were grown on a flat sapphire substrate using MOCVD technique. Results showed that a higher V/III ratio led to parasitic behavior by hydrogen dissociated from ammonia, which etched the InN and changed the growth morphology. Moreover, the InGaN thin films grown at higher V/III ratios exhibited more stable bandgap energy and improved electrical properties. The correlation between strain and carrier density was also discussed, and it was concluded that high-quality and thick InGaN thin films could be grown for solar cell applications at higher V/III ratio conditions.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Electrical & Electronic
Nikolaos-Panteleimon Diamantopoulos, Takuro Fujii, Suguru Yamaoka, Hidetaka Nishi, Koji Takeda, Tai Tsuchizawa, Toru Segawa, Takaaki Kakitsuka, Shinji Matsuo
Summary: This article presents a two-channel energy-efficient directly-modulated membrane laser array on SiO2/Si substrate with 60 GHz bandwidth. The laser array supports data transmission of 100 Gbps per lane, with small form-factors and low power consumptions. Experimental results demonstrate successful 200 Gbps transmissions and the feasibility of 400 Gbps transmissions. In addition, the temperature dependence of the PPR effect is studied for the first time through experiments and numerical simulations.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
M. Beraich, M. Oubakala, H. Shaili, S. Mansouri, M. Rouchdi, A. El Hat, M. Taibi, A. Guenbour, A. Bellaouchou, A. Zarrouk, M. Fahoume
Summary: This study successfully synthesized the Cu2MgGeS4 quaternary compound thin film and characterized its properties. The results showed that the compound had the ideal stoichiometry, characteristic crystal structure, and good optical properties, indicating its potential for solar conversion applications.
Review
Nanoscience & Nanotechnology
Yan Liang, Chandrasekar Perumalveeramalai, Guochen Lin, Xiangbin Su, Xiaoming Zhang, Shuai Feng, Yingqiang Xu, Chuanbo Li
Summary: This article introduces the crucial role of on-chip avalanche photodiodes (APDs) in fully integrated photonics systems, particularly the application of III-V compound APDs in optical fiber communication reception. The improvement of APD performance is achieved through advancements in structural design and material choice. It is necessary to review the evolution and recent developments of III-V compound APDs to understand the current progress in the field, including different types of APDs and potential future directions.
Article
Optics
S. A. Alghamdi, A. A. A. Darwish, I. S. Yahia, E. F. M. El-Zaidia
Summary: The structure and optical properties of InClPc films deposited on FTO substrates by thermal vacuum evaporation technique were studied, revealing two energy gaps and nonlinear optical parameters. The optical limiting testing showed high performance of the red He-Ne laser.
Review
Energy & Fuels
Jie Chen, Corinne E. Packard
Summary: Controlled spalling is a fast process for mechanically exfoliating III-V semiconductor layers, potentially producing high power-density, flexible solar cells. By tuning stressor layer and peeling force, controlled spalling maintains device performance and saves cost and material resources.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2021)
Article
Engineering, Electrical & Electronic
A. Akkerman, J. Barak, M. Murat
Summary: This article introduces the concept and calculation method of nonionizing energy loss (NIEL), as well as the importance and relevance of NIEL values research. By comparing classical NIEL (NIELc) and effective NIEL (NIELeff) data, it is shown that they yield similar results in calculating displacement damage effects.
IEEE TRANSACTIONS ON NUCLEAR SCIENCE
(2022)
Article
Chemistry, Physical
M. Haripriya, Anuradha M. Ashok, Shamima Hussain, R. Sivasubramanian
Summary: In this study, MnCo(2)O(4) nanorods were successfully prepared using urea as a stabilizing and directing agent. Characterization techniques including SEM, TEM, FTIR, XRD, and XPS were used to study the morphological, chemical, and crystal structure of the materials. The electrochemical performance of MnCo(2)O(4) nanorods in supercapacitor application was evaluated, showing promising results with high specific capacitance and cyclic stability. The asymmetric supercapacitor fabricated using AC MnCo(2)O(4) nanorods also demonstrated good specific capacitance, indicating the potential of MnCo(2)O(4) for supercapacitor applications.
Article
Materials Science, Multidisciplinary
Shamima Hussain, Siddhartha Dam
Summary: Highly oriented, vertically stacked, thin films of tungsten disulphide (WS2) were synthesized using electron-beam evaporation, and the growth mechanism and evolution of the thin films were studied. The films exhibited semiconductor behavior, with changes in properties observed after annealing. Additionally, a heterojunction of WS2 (1073 K)/pSi displayed an increased photocurrent under white light illumination.
Article
Engineering, Electrical & Electronic
Siddhartha Dam, Abhishek Thakur, Shamima Hussain
Summary: Thin film heterojunctions of MoS2/Si synthesized by chemical bath deposition technique were studied for their photoresponse. The presence of strain, confirmed by Raman and XRD, was found to enhance the photo-detectivity. An increase in particle size with annealing temperature was observed. XPS studies accurately determined the phases, showing a decrease in valence band maxima with increasing strain. Samples containing 24% MoS3 exhibited very high photo-detectivity (around 10^13).
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Mandeep Jangra, Siddhartha Dam, Abhishek Thakur, Shamima Hussain
Summary: The study involved the deposition of free-standing, flexible composite films of PVDF/PEDOT:PSS, with increasing conductivity observed with higher additive concentrations. The conductivity of the composite films varied with temperature, showing semiconducting behavior, and followed the Mott Variable Range Hopping model of conduction.
Article
Materials Science, Multidisciplinary
Siddhartha Dam, Abhijit Saha, Shamima Hussain
Summary: The photoresponse properties of Tungsten disulphide (WS2)/Silicon (Si) thin films, synthesised by the e-beam evaporation technique, exhibited high absorbance in the visible range and a type-II heterojunction. Photodetection studies showed a high responsivity of 1.17 AW(-1) at an illumination of 1.6 mWcm(-2) of white light.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Abhishek Thakur, Mandeep Jangra, Siddhartha Dam, Shamima Hussain
Summary: Flexible composite films of PVDF with GaN as fillers were synthesized using sol-gel method, and the effects of fillers on the microstructural, morphological and dielectric properties of the films were investigated.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Materials Science, Multidisciplinary
Abhishek Thakur, Siddhartha Dam, Shamima Hussain
Summary: Free-standing poly(vinylidene fluoride) films were synthesized using sol-gel method and were then studied for the effects of 200 keV H+ ion implantation. The ion implantation caused a noticeable color change in the films and the larger spherulites broke up into smaller ones. Microstructural analysis revealed an increase in amorphous content and microscopic and vibrational spectroscopy showed the loss of crystalline nature upon irradiation. The effect of ion implantation on the electroactive phases and the non-polar a phase was discussed.
Article
Materials Science, Multidisciplinary
Siddhartha Dam, Shamima Hussain
Summary: The photoresponse properties of a MoS2/GaAs heterojunction under ambient light conditions are reported. The heterojunctions formed by chemically deposited MoS2 film on GaAs wafers showed an enhancement in responsivity by two orders and an increase in specific detectivity by six orders.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Rajkumar Dey, Shamima Hussain, Arun Kumar Pal
Summary: Diamond-like carbon (DLC) films were deposited using pulsed laser deposition technique with a glassy carbon disc as the carbon source. Boron doping in DLC films was achieved by ablating a boron disc during the synthesis process. The study found that boron doping significantly affected the structure and electrical properties of DLC films.
Review
Chemistry, Physical
Suchinder K. Sharma, Jinu James, Shailendra Kumar Gupta, Shamima Hussain
Summary: The field of persistent luminescence, which had been largely dormant, gained new momentum with the discovery of strontium aluminate phosphor in 1996. Extensive efforts have been made to develop efficient and long-lasting persistent luminescent materials for various applications. The most explored materials emit in the visible wavelength range of 400-650 nm, but the range has been extended beyond 650 nm for biological applications since 2014. Recently, UV-emitting persistent materials have attracted interest for their potential in information storage, phototherapy, and photocatalysis. This review summarizes the recent developments in UV-emitting persistent luminescent materials to inspire young researchers in the field.
Article
Polymer Science
Mandeep Jangra, Abhishek Thakur, Siddhartha Dam, Shamima Hussain
Summary: Freestanding composite films of PVDF and cellulose were synthesized and characterized. The films exhibited hydrophobicity and increased dielectric constant compared to pristine films. A triboelectric nanogenerator fabricated using these films demonstrated a high output power density.
JOURNAL OF POLYMER SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Mandeep Jangra, Abhishek Thakur, Siddhartha Dam, Souvik Chatterjee, Shamima Hussain
Summary: Enhanced dielectric constant (-5 times) in free-standing, flexible composite films of PVDF with MoS2 nanoflakes, synthesized using sol-gel method, was reported. The dielectric constant of the composite films varied with the filler concentration modulation. At 100 Hz, the dielectric constant of the films with 1 wt% filler concentration was found to be -40. A significant enhancement of -900 times in the remanent polarization was obtained for the same composite film. A TENG fabricated from a composite film with 1 wt% filler concentration generated an output power of -18 μW/cm^2.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
U. K. Panigrahi, B. Sahu, H. G. Behuria, S. K. Sahu, S. P. Dhal, Shamima Hussain, P. Mallick
Summary: ZnO nanoparticles embedded in zinc acetate matrix were synthesized and characterized under different concentrations of thio-acetamide, showing structural, morphological, optical, and bioactivity changes. The nanoparticles exhibited antimicrobial activity against common human pathogenic bacteria, with the potential to fight drug resistance against K. pneumoniae and S. aureus.
Article
Physics, Multidisciplinary
Siddhartha Dam, Abhishek Thakur, Shamima Hussain, N. V. Chandra Shekar, G. Amarendra
Summary: The anisotropic behavior of the A(1g) vibrational mode of MoS2 at the edges is analyzed using polarized Raman spectroscopy, with emphasis on the direction-dependent intensity to characterize the angle between edges and determine their chirality.
EUROPEAN PHYSICAL JOURNAL PLUS
(2021)
Article
Crystallography
Abhishek Thakur, Jangra Mandeep, Siddhartha Dam, N. V. Chandra Shekar, G. Amarendra, Shamima Hussain, P. V. Rajesh, Abhijit Saha
Summary: Freestanding, flexible, composite thin films of MoS2/PVDF were synthesized using the sol-gel method, with optimized filler concentration influencing the formation of electroactive phases. The addition of nanoflake fillers significantly enhanced the electroactive phase, while reducing the crystallinity of the host polymer matrix and changing its morphology.
POLYMER CRYSTALLIZATION
(2021)
