Article
Chemistry, Multidisciplinary
V. Dolezal, V. Jakes, J. Petrasek, P. Ctibor, O. Jankovsky, K. Rubesova, D. Sedmidubsky
Summary: The perovskite-type phase CaCu3Ti4O12 has promising dielectric properties, but the phenomenon of giant permittivity in this material has not been fully explained. In this study, Europium with similar electronegativity and ionic radius as Calcium was tested as a partial or complete substitute. A series of materials, including CaCu3Ti4O12, Eu0.4Ca0.6Cu3Ti4O12, and EuCu3Ti4O12, were prepared using a sol-gel method and sintering. The influence of microstructure and phase composition on the dielectric properties of the samples, as well as the effect of sintering temperature, was investigated. Secondary phases and microstructure were found to play a significant role in improving the permittivity values, which were found to be giant at higher frequencies but significantly different for specific compositions.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2023)
Article
Chemistry, Multidisciplinary
K. Rubesova, V Jakes, O. Jankovsky, M. Lojka, D. Sedmidubsky
Summary: Two precursors were prepared using a solid state reaction and a sol-gel process, their phase evolution during a 4-step calcination process was observed, and final samples were sintered with either fast or slow cooling. The phase composition, microstructure, and thermoelectric characteristics of the final samples varied, with results showing that the thermoelectric properties depended on the precursors used.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2022)
Article
Materials Science, Ceramics
Murilo Dobri Bataliotti, Francine Bettio Costa, Fernando Brondani Minussi, Eudes Borges Araujo, Nelson Batista de Lima, Joao Carlos Silos Moraes
Summary: Tellurium dioxide thin films were prepared using the Pechini method and their structural properties were controlled through heat treatment at different temperatures. The results showed that the heat treatment temperature directly influenced the crystallite size and surface roughness of the films.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
R. Sharma, P. K. Ojha, S. K. Mishra
Summary: In this study, uniform polycrystalline YIG thin films were grown on thermally oxidized Si (100) substrates. X-ray diffraction confirmed the single-phase formation of YIG. Surface morphology and thickness of the thin films were examined using scanning electron microscopy. X-ray photoemission was used to investigate the valence state of constituent elements in the ferrimagnetic thin films with saturation magnetization of 3.11 mu s/f.u. The lowest Gilbert damping constant (a) = 4.754 x 10-3 with an inhomogeneous contribution to the linewidth of 5.04 mT was observed due to extrinsic inhomogeneous growth of the deposited films.
Article
Chemistry, Physical
J. Chakraborty, T. Oellers, R. Raghavan, A. Ludwig, G. Dehm
Summary: The microstructure evolution and stress development in Cu-Zr alloy thin films were studied using GIXRD and STEM, revealing the generation of dislocations and planar faults with increasing Zr composition, leading to tensile stresses and stress gradients.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Fiza Mumtaz, G. Hassnain Jaffari, G. Shabir Khan
Summary: In this study, the local structure of BiFeO3 has been systematically manipulated and its correlation with the electronic structure has been examined in detail. By substituting Eu3+ ions, the structural modification affected bond length, bond angle, and octahedral rotation, leading to a higher symmetry configuration. The changes in electronic transitions and the emergence of 4f levels of the rare earth substituent have been investigated as a function of local changes at the unit cell level. The forbidden electronic transition 6A1g -> 4T1g in a centrosymmetric configuration has also been discussed.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Chemistry, Physical
Yuxin He, M. Arif Khan, Andrew Drake, Ramy Ghanim, Joshua Garay, Aniruddha Shirodkar, Joseph Strzalka, Qingteng Zhang, Barbara L. Knutson, Stephen E. Rankin
Summary: The development of mesoporous structure during calcination of titania-doped mesoporous silica thin films was characterized by in situ grazing-incidence small-angle X-ray scattering (GISAXS). The incorporation of titania using different methods and amounts influenced the final structure of the films, with weak Si-O-Ti bonds playing a crucial role in the sintering process. Anisotropic stress and annealing led to the merging of randomly oriented pores into vertically oriented channels with a pore diameter of around 2.3 nm. Surfactant complexation also played a role in the transformation of the structure.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Asma A. Medjahed, Tao Zhou, Juan Camilo Alvarez Quiceno, Pia Dally, Pascal Pochet, Tobias U. Schulli, David Djurado, Peter Reiss, Stephanie Pouget
Summary: This study investigates the mechanisms of strain and texture observed in MAPbI(3) thin films deposited on various oxide substrates. The results show that the strain of the perovskite layers is essentially relaxed behavior, contradicting the commonly accepted hypothesis. The texture in the perovskite layers is studied using synchrotron full-field diffraction X-ray microscopy, and the stability of different orientations is analyzed by DFT calculations.
ADVANCED ENERGY MATERIALS
(2022)
Article
Physics, Condensed Matter
Muhammad Zain Yar, Muhammad Khalid, Muhammad Yasin, Kiran Naz, Muhammad Gul Bahar Ashiq, Muhammad Younas, Thamraa Alshahrani, Khaild I. Hussein, Khizar Bin Hassan, Bilal Ahmed, M. Mohamed Javid
Summary: The manganese-substituted nickel-rich lithium-cobalt oxide Li2Ni6MnxCo2-xO10 was successfully synthesized using the sol-gel autocombustion method. The structure and morphology of the material were characterized by XRD and SEM techniques, respectively. The prepared nanomaterial exhibited a hexagonal structure with a secondary phase. The average crystallite size was determined to be between 12 and 27 nm using different methods. SEM analysis showed the surface morphology and particle size distribution. The dielectric characteristics of the material were frequency-dependent, indicating suitability for high-frequency devices. Magnetic measurements revealed variations in saturation magnetization and coercivity with increasing Mn concentration. The obtained dielectric properties suggest potential applications in energy storage.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Materials Science, Multidisciplinary
Amit Kumar, Piyush K. Patel, K. L. Yadav, Yogendra Singh, Naveen Kumar, Abdullah, G. Sharma, Satyendra Singh
Summary: The effect of grain boundary resistance (G(BR)) and grain resistance (G(R)) on the magnetoelectric coupling in multiferroic composite thick films of BiFeO3 (BFO) nanocrystalline powder and poly vinylidene-fluoride (PVDF) polymer is significant. The study shows that grain boundary resistance plays an important role in strengthening the magnetoelectric effect in the BFO-PVDF system, with the BFO50 sample demonstrating promising results for device and sensor applications.
MATERIALS RESEARCH BULLETIN
(2022)
Article
Chemistry, Physical
Pankaj Gupta, Richa Tomar, Mohit Sahni, Sunil Chauhan
Summary: Cobalt, nickel, and copper doped non-stoichiometric CdGa2O4 were synthesized and characterized using various techniques. The doped samples showed both antiferromagnetic and ferromagnetic behavior, and the transition metal doping also promoted the photodegradation of methylene blue and Rhodamine B dye.
Article
Chemistry, Multidisciplinary
Xiaolong Zhang, Hongli Suo, Zili Zhang, Shuai Ye, Lin Ma, Min Liu, Yaotang Ji, Xufeng Wang, Kausar Shaheen, Lei Wang, Qiuliang Wang
Summary: Doping of nanoparticles is an effective method to improve the performance of nanocomposite thin films. This study utilized 2D-XRD technique to investigate the orientation and phase evolution of BYNO doped particles in YBCO. It was found that the BYNO particles near the LAO substrate had the same orientation, while the rest of the particles had random orientation. The higher random orientation of BYNO particles contributed to the improved superconducting properties of the thin films. A nucleation and growth model for the BYNO-doped YBCO nanocomposite film was established.
Article
Chemistry, Multidisciplinary
Hala R. Mahmoud, M. Saif, Mona A. Naghmash
Summary: In this study, M/BS@Ag core-shell nanoparticles were prepared for the first time as catalysts for the catalytic decomposition of hydrogen peroxide. The nanoparticles were synthesized in a simple two-step process, with the M/BS catalysts and Ag being coated through a thermal reduction route to form the core-shell structure, showing good catalytic activity and stability.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2022)
Article
Materials Science, Multidisciplinary
Ana C. Murrieta, Danyel Cavazos-Cavazos, Pamela Santos-Aguilar, Jorge L. Cholula-Diaz, Flavio F. Contreras-Torres
Summary: X-ray line profile analysis was used to study the microstructures of gold nanoparticles and gold thin-films, revealing larger crystallite size and lower dislocation density in AuTFs compared to AuNPs. The differences in strain, average distances among dislocations, and broadening effects were observed between AuNPs and AuTFs, suggesting different mechanisms contributing to the line broadening in the two types of samples.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Materials Science, Ceramics
V Ganesh, Yugandhar Bitla, L. Haritha, Mohd Shkir, S. AlFaify
Summary: Cadmium oxide (CdO) thin films doped with different concentrations of yttrium (Y) were prepared using the spin coating technique. The study investigated the impact of Y doping on the structural, morphological, linear, and nonlinear optical properties of the CdO thin films. Results showed an increase in grain size with higher Y doping, and a significant suppression of both linear and nonlinear optical properties.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Sujit A. Kadam, Yuan-Ron Ma, Yan-Ruei Chen, Yuvraj H. Navale, Amol S. Salunkhe, Vikas B. Patil, Sachin D. Ralegankar, Pravin D. More
Summary: Among all the transition metal oxides, iron oxide-based materials are excellent for supercapacitor performance. In this study, Mn-incorporated alpha-Fe2O3 nanostructured thin films were prepared via spray pyrolysis. The effects of Mn concentration on the structural and optical properties of the films were investigated. It was found that increasing Mn concentration can tune the band gap of the films and affect the supercapacitive performance. The 7% Mn-incorporated alpha-Fe2O3 nanostructured electrode exhibited excellent specific capacitance, energy density, and power density in the electrolyte.
JOURNAL OF ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Analytical
Gajanan M. Hingangavkar, Yuvraj H. Navale, Tanaji M. Nimbalkar, Ramesh N. Mulik, Vikas B. Patil
Summary: Nanoflowers of WO3 were grown on glass substrate using an inexpensive hydrothermal method at low temperatures. The structure and morphology of the WO3 nanoflowers were studied using various characterization techniques. The nanoflowers exhibited a hexagonal crystal structure and a porous morphology with a high specific surface area. They showed exceptional gas sensing properties towards toxic NO2 gas, with good reproducibility and stability. The interaction mechanism between the gas and the WO3 nanoflowers was investigated using impedance spectroscopy.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Chemistry, Multidisciplinary
Pravin More, Sujit A. Kadam, Yuan-Ron Ma, Yan-Ruei Chen, Nilesh Tarwal, Yuvraj Navale, Amol Salunkhe, Vikas Patil
Summary: A pristine copper oxide and manganese-doped copper oxide nanostructured films were prepared using a simple spray pyrolysis technique. The effects of Mn doping on the supercapacitive performance of the copper oxide electrode were studied, and a maximum specific capacitance of 801.61 F/g was obtained for the manganese-doped copper oxide thin film electrode.
Article
Materials Science, Multidisciplinary
N. L. Tarwal, D. P. Mali, K. V. Patil, S. L. Patil, V. L. Patil, V. B. Patil, C. C. Revadekar, T. D. Dongale, P. S. Patil, P. M. Shirage, J. H. Jang
Summary: In this study, nanostructured ZnO thin films were deposited on glass/FTO substrates using a simple and cost-effective spray pyrolysis technique. The structural and compositional properties of the deposited films were investigated, and it was found that they exhibited a crystalline nature with nanoflakes-like morphology. The bipolar resistive switching properties of the fabricated memristive devices were also studied, and it was observed that they showed non-ideal memristor behavior. Additionally, the ZnO-based memristive devices exhibited good non-volatile memory properties and reliable device performance.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Kailas K. K. Tehare, Priyanka K. K. Bhadke, Sambhaji S. S. Bhande, Sachin T. T. Navale
Summary: The effects of acidic treatment on the photovoltaic properties of dye-sensitized solar cells were investigated. TiO2 nanostructure was prepared using a chemical bath deposition method and modified with various acidic treatments. The results showed that acidic treatments significantly affected the structure, morphology, optical properties, electrochemical properties, and photovoltaic properties. XRD analysis confirmed the formation of TiO2 nanostructure electrodes. After acidic surface treatment, the photoconversion efficiency increased from 1.97% to 3.23%, electron lifetime increased, and charge transfer resistance decreased.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Chemistry, Physical
Gajanan M. Hingangavkar, Sujit A. Kadam, Yuan-Ron Ma, Ramesh N. Mulik, Vikas B. Patil
Summary: Facile hydrothermal route was employed to prepare MoS2 nanoparticles (NPs) with superior specific surface area and hexagonal lattice structure. The MoS2 NPs demonstrated excellent gas sensing performance towards H2S gas, with a fast response and recovery time. It could detect as low as 1 ppm concentration of H2S gas.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Electrical & Electronic
Reshma N. Dhanawade, Nanasaheb S. Pawar, Manik A. Chougule, Gajanan M. Hingangavkar, Yogesh M. Jadhav, Tanaji M. Nimbalkar, Yuvraj H. Navale, Ganesh T. Chavan, Chan-Wook Jeon, Vikas B. Patil
Summary: A room temperature (25 degrees C) NH3 biomarker sensor using polyaniline (PAni)-CeO2 nanohybrid was developed. The nanohybrid exhibits a cubic crystal structure with interconnected nanofiber surface morphology. The sensor shows a significant response towards NH3 gas and has excellent stability, reproducibility, and response time. The interaction mechanism between NH3 gas and the sensor was studied using impedance spectroscopy.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Avinash C. Molane, Shivani S. Gavande, Tanaji M. Nimbalkar, Amol S. Salunkhe, Pravin D. More, Vikas B. Patil
Summary: In this study, a facile electrospinning method was used to fabricate nanofibrous tin oxide electrodes with different annealing temperatures, which showed potential in high-performance energy storage applications. The tin oxide processed at 400 degrees C exhibited excellent specific capacitance (844 F/g) and interfacial capacitance (0.1434 F/cm(2)) at 1 mV/s scan rate in 1 M NaOH aqueous electrolyte, and demonstrated remarkable stability even after 2000 cycles. The electrodes were confirmed to have a morphology with beads formation through scanning electron microscopy, and the hydrophilic nature of the electrode surface was confirmed by water contact angle measurements. Structural analysis was conducted using X-ray diffraction (XRD), Raman spectroscopy, Energy dispersive X-ray analysis (EDAX), and X-ray photoelectron spectroscopy (XPS). Furthermore, the flexible symmetric supercapacitor device showed excellent flexibility and electrochemical stability during mechanical bending up to 180 degrees, suggesting that SnO2 is a promising electrode material for future flexible and wearable electronics devices.
Article
Chemistry, Multidisciplinary
Reshma N. Dhanawade, Nanasaheb S. Pawar, Manik A. Chougule, Gajanan M. Hingangavkar, Tanaji M. Nimbalkar, Ganesh T. Chavan, Chan-Wook Jeon, Vikas B. Patil
Summary: In this study, PAni-CeO2 nanohybrids with CSA intercalation (10-50 wt %) were synthesized by facile chemical oxidative polymerization. The structural and morphological properties of the nanohybrids were investigated using XRD, SEM, TEM, XPS, and Raman spectroscopy. The gas sensing performance of the CSA intercalated PAni-CeO2 nanohybrids was explored, and the results showed that PAni-CeO2-CSA (50 wt %) nanohybrid exhibited a highest response of 93% towards 100 ppm NH3 at 30 degrees C, with fast response, quick recovery, and admirable stability.
Article
Engineering, Environmental
Gajanan M. Hingangavkar, Sujit A. Kadam, Yuan-Ron Ma, Sushilkumar S. Bandgar, Ramesh N. Mulik, Vikas B. Patil
Summary: A hydrothermal route was used to synthesize molybdenum disulfide (MoS2)-graphene oxide (GO) hybrids. Various characterization techniques were employed to analyze the gas sensing performance of the prepared MoS2-GO (1 to 5 wt%) hybrids. The results showed that the hybrid with 3% GO exhibited the highest response towards 100 ppm hydrogen sulfide (H2S) gas at room temperature, with the lowest detected concentration of 1 ppm and a response value of 0.51%. This study investigated the synergistic effect of MoS2 NPs and GO sheets on the gas sensing performance for the first time.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Applied
Uzma K. H. Bangi, Akshay A. Ransing, Rushikesh P. Dhavale, Hyung-Ho Park, Vikas B. Patil
Summary: Experimental work was conducted to enhance the properties of ambient pressure dried silica aerogels for thermal insulation applications. The quality of the aerogels produced was determined by the sol-gel method and silylating agent used. A two-step sol-gel method was employed to synthesize sodium silicate-based aerogels, with silylation carried out using trimethylchlorosilane (TMCS). The aerogels prepared using 33.3% TMCS exhibited desirable characteristics such as narrow pore size distribution, homogenous tiny particles, improved visual optical transmission, low density, low thermal conductivity, high specific heat capacity, high porosity, high surface area, and stable hydrophobicity up to 445°C. The thermal insulating property of these aerogels was confirmed in the laboratory, demonstrating their suitability for thermal insulation.
JOURNAL OF POROUS MATERIALS
(2023)
Article
Chemistry, Analytical
Linh Ho Thuy Nguyen, Sachin T. Navale, Dong Hoon Yang, Hue Thi Thu Nguyen, Thang Bach Phan, Jin-Young Kim, Ali Mirzaei, Tan Le Hoang Doan, Sang Sub Kim, Hyoun Woo Kim
Summary: This work demonstrates the potential of a novel Fe-MOF (VNU-15) to effectively detect low-concentration VOCs, particularly acetone, using a solvothermal strategy for synthesis. Fe-MOFs synthesized in this way exhibited high crystallinity, thermal stability, polyhedral crystal-shaped morphology, and a large surface area, making them suitable for gas-sensing applications. Lab-scale gas-sensing devices fabricated with Fe-MOF powder showed selectivity for detecting acetone with a gas response of 1.68-10 ppm and a response time of 64 s at 50 degrees C.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Chemistry, Physical
Tanaji M. Nimbalkar, Yogesh M. Jadhav, Reshma N. Dhanawade, Nanasaheb S. Pawar, Avinash C. Molane, Shivani S. Gavande, Ganesh T. Chavan, Chan-Wook Jeon, Shrikrishna D. Sartale, Vikas B. Patil
Summary: CeO2 nanoparticles were synthesized using a simple chemical method without surfactants or additives at low temperature and short reaction time. The effect of annealing temperatures on the structural, morphological, and chemiresistive properties of the CeO2 nanoparticles was investigated. The CeO2 nanoparticles exhibited a cubic crystal structure and porous morphology, with a specific surface area of 52.92 m2/g. The optimized operating temperature was found to be 150 degrees C, showing excellent response and stability towards NO2 gas.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Review
Chemistry, Inorganic & Nuclear
Sanjit Manohar Majhi, Sachin T. Navale, Ali Mirzaei, Hyoun Woo Kim, Sang Sub Kim
Summary: The development of effective and efficient materials for gas detection is crucial for protecting human health and the environment. Indium oxide has attracted attention due to its gas-sensing applications, but its limited selectivity and performance under humid conditions are challenges. This review explores various strategies, such as morphology engineering and doping, to improve the gas detection performance of indium oxide-based sensors. Different composites of indium oxide have been evaluated to enhance their sensing performances. The review also provides a future outlook on the progress of indium oxide gas sensors.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Review
Chemistry, Analytical
Sachin Navale, Ali Mirzaei, Sanjit Manohar Majhi, Hyoun Woo Kim, Sang Sub Kim
Summary: This review presents the cutting-edge research on chemiresistive gas sensors in Korea, specifically focusing on the research activities of Professors Sang Sub Kim and Hyoun Woo Kim. The review discusses advances in synthesis techniques and strategies to enhance gas-sensing performances of different nanomaterials. It also highlights important achievements, such as optimizing shell thickness in core-shell gas sensors and the design of selective and highly flexible gas sensors-based on WS2 nanosheets.
Article
Engineering, Electrical & Electronic
Nishi Mehak, Bindu Rani, Aadil Fayaz Wani, Shakeel Ahmad Khandy, Ajay Singh Verma, Atif Mossad Ali, M. A. Sayed, Shobhna Dhiman, Kulwinder Kaur
Summary: In this study, the electronic, structural, and thermoelectric properties of newly designed layered rare-earth metal germanide halides were investigated. The materials showed promising thermoelectric performance, making them suitable candidates for energy harvesting in thermoelectric applications.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2024)
Article
Engineering, Electrical & Electronic
Devidas I. Halge, Vijaykiran N. Narwade, Nabeel M. S. Kaawash, Pooja M. Khanzode, Sohel J. Shaikh, Jagdish W. Dadge, Prashant S. Alegaonkar, Rajeshkumar S. Hyam, Kashinath A. Bogle
Summary: This study presents the design and fabrication of a high-performance blue light photodetector using an n-type cadmium sulfide (CdS) thin film and a p-type polyaniline (PANI). The photodetector demonstrates exceptional performance characteristics, including high responsivity, detectivity, and sensitivity, along with rapid response time and rectification behavior. The research represents a significant advancement in the field of high-performance photodetectors.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2024)
Article
Engineering, Electrical & Electronic
Da Hu, Jiabin Lu, Qiusheng Yan, Yingrong Luo, Ziyuan Luo
Summary: This study introduces a chemical mechanical polishing technique based on metal electrochemical corrosion for single-crystal SiC to address the environmental pollution caused by the polishing solution in chemical mechanical polishing. Wear experiments were conducted to investigate the wear properties of SiC C-surface under different grinding ball materials and solutions. The proposed mechanism of material removal in single-crystal SiC via metal electrochemical corrosion was discussed.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2024)
Article
Engineering, Electrical & Electronic
Lifang Mei, Long Lin, Dongbing Yan, Yu Liang, Yu Wu, Shuixuan Chen
Summary: This paper investigates the removal of CuO particles from silicon wafer surfaces using a picosecond laser. Numerical calculations and experimental research were conducted, and a thermal-stress coupled finite element model was established. The results show that as the laser energy density increases, the removal rate of CuO particles initially increases and then decreases, while the roughness of the silicon substrate decreases and then increases.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2024)
Article
Engineering, Electrical & Electronic
Michihiro Yamada, Shuhei Kusumoto, Atsuya Yamada, Kentarou Sawano, Kohei Hamaya
Summary: In this study, we demonstrated the low-temperature growth of a Ge layer on a Co-based Heusler alloy via Sn doping, which improved the magnetic properties and spin signal.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2024)
Article
Engineering, Electrical & Electronic
Xiang-Long Wei, Bao-Feng Shan, Zong-Yan Zhao
Summary: This study synthesized and characterized a CuAlO2/CuGaO2 heterostructure and evaluated its photocatalytic performance. The heterostructure exhibited superior performance compared to individual CuAlO2 and CuGaO2 photocatalysts, with increased carrier concentration, enhanced redox capabilities, superior electrochemical stability, and reduced interfacial resistance. Photocatalytic experiments demonstrated the remarkable oxidation potential and notable reduction activity of the heterostructure, outperforming CuAlO2 and CuGaO2 in degradation rates and hydrogen production rates, respectively. These findings highlight the superior performance and broad applicability of the CuAlO2/CuGaO2 heterostructure in various photocatalytic reactions.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2024)
Article
Engineering, Electrical & Electronic
Micka Bah, Daniel Alquier, Marie Lesecq, Nicolas Defrance, Damien Valente, Thi Huong Ngo, Eric Frayssinet, Marc Portail, Jean-Claude De Jaeger, Yvon Cordier
Summary: This study investigates the AlN nucleation layer issue in GaN high frequency telecommunication and power switching systems fabricated after heteroepitaxy on Silicon or Silicon Carbide. It is shown that using 3C-SiC as an intermediate layer can significantly decrease RF propagation losses. Measurements and analyses demonstrate that dopant diffusion into the 3C-SiC pseudo-substrate is confined beneath the interface, and a slightly conductive zone is present beneath the AlN/3C-SiC interface, explaining the low propagation losses obtained for the devices. This work highlights the importance and efficiency of the 3C-SiC intermediate layer as a pseudo-substrate.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2024)
Article
Engineering, Electrical & Electronic
Shuang Wang, Lijun Wu, Zhiqing Wang, Ziyue Qian
Summary: The geometric structure and electrical properties of zigzag and armchair DWSiNT perfect tubes with different Stone-Wales defects were simulated using the SCC-DFTB method. It was found that the atomic arrangement, stability, energy gap, and charge distribution strongly depend on the type of tube. The effects of strong and weak electric fields on the tubes were also investigated, showing different impact on stability and energy gap. These findings have implications for future experimental studies.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2024)
Article
Engineering, Electrical & Electronic
Nanda Kumar Reddy Nallabala, Sunil Singh Kushvaha, Sambasivam Sangaraju, Venkata Krishnaiah Kummara
Summary: This study focuses on the preparation and performance of MIS-type high-k dielectric oxide-based UV photodetectors. The researchers found that the Au/Ta2O5/GaN devices prepared on Ta2O5/GaN heterojunction with post-annealing exhibited improved photoresponsivity, EQE, and rise/fall times. This improvement is attributed to the optimized band configuration of the Ta2O5/GaN heterostructure and the effect of post-annealing on photogenerated charge carriers.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2024)
Article
Engineering, Electrical & Electronic
Jean-Francois Michaud, Marc Portail, Daniel Alquier, Dominique Certon, Isabelle Dufour
Summary: This paper reviews the use of MEMS devices without sensitive layers in gas detection applications. These devices can measure a physical property of the gas to determine its concentration, and have the advantages of generality and high detection limits.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2024)
Article
Engineering, Electrical & Electronic
Kanyu Yang, Chaojie Shi, Ruizhao Tian, Haoyue Deng, Jie He, Yangyang Qi, Zhengchun Yang, Jinshi Zhao, Zhen Fan, Jun Liu
Summary: This study investigates the electrical and synaptic properties of Ag/TiO2 nanorod/FTO-based RRAM devices, focusing on the impact of different seed layer thicknesses on nanorod thickness and RRAM performance. The devices show remarkable achievements in terms of endurance, self-compliance, and resistance switching ratio. The switching mechanism is attributed to space-charge-limited conduction resulting from electron trapping in oxygen vacancy traps. The devices also maintain stable synaptic properties even after undergoing multiple cycles of long-term potentiation and depression.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2024)
Article
Engineering, Electrical & Electronic
Karthickraj Muthuramalingam, Wei-Chih Wang
Summary: This study presents a non-destructive approach using terahertz time-domain spectroscopy (THz-TDS) to estimate the electrical properties of semi-insulating compound semiconductors. The study successfully measures the resistivity and carrier concentration of semi-insulating Silicon Carbide (SiC) and Indium Phosphide (InP) wafers using THz-TDS in transmission mode. The simplified Drude model and the Nelder-Mead algorithm are employed to estimate the electrical properties, and the results are in accordance with the manufacturer specifications. The feasibility of non-destructive mapping of the electrical properties is demonstrated, offering a promising tomographic inspection approach for online monitoring.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2024)
Article
Engineering, Electrical & Electronic
Pengfei Wei, Rui Tong, Xiaofeng Liu, Yao Wei, Yongan Zhang, Xu Liu, Jian Dai, Haipeng Yin, Dongming Liu
Summary: This study investigates the influence of SiNx and SiOxNy as rear-side passivation films on the performance of PERC+ cells. SiNx film is found to have better passivation performance and resistance to aluminum paste erosion, while SiOxNy film exhibits better optical performance. By designing multi-layer SiNx/SiOxNy/SiNx stacks, the cells' efficiency and bifaciality are significantly improved.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2024)
Article
Engineering, Electrical & Electronic
Shuangting Ruan, Xiaolan Li, Wen Cui, Zhihui Zhang, Zhihui Xu, Huanqi Cao, Shougen Yin, Shishuai Sun
Summary: Integrating photosensitive electrode materials can effectively improve the low temperature tolerance and enhance energy density and power density. The surface morphology reconstruction technique can increase the active surface area and improve electrolyte contact, leading to higher specific capacity. Additionally, the electrodes demonstrate excellent photoelectric and photothermal conversion abilities, allowing the supercapacitor to maintain high energy density even at low temperatures.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2024)
Review
Engineering, Electrical & Electronic
Ashmalina Rahman, James Robert Jennings, Mohammad Mansoob Khan
Summary: This review provides a comprehensive overview of the synthesis and applications of nanostructured CuInS2 in photocatalytic applications. Various strategies, including the introduction of dopants, surface decoration, and heterojunction formation, have been summarized to improve the photocatalytic performance of CuInS2. However, scientific challenges such as the high carrier recombination rate limit the broad application of CuInS2.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2024)
