Review
Chemistry, Multidisciplinary
Ziliang Li, Ziqing Li, Chaolei Zuo, Xiaosheng Fang
Summary: Titanium dioxide (TiO2) as a wide-bandgap semiconductor material has gained significant attention for applications in fields like environmental and energy. Constructing high-performance photodetectors (PDs) based on TiO2 nanostructures with efficient microtopography and device configuration, while understanding key parameters influencing carrier behavior, is crucial for improved photoelectric performance and functional applications. This work provides an in-depth illustration of the electrical and optical properties of TiO2 nanostructures and advancements in technological issues for future applications.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Hao-Chin Huang, Kai-Yuan Hsiao, Yu-Han Tseng, Yan-De Chen, Ming-Yen Lu
Summary: In this study, an in situ transmission electron microscopy (TEM) heating system was used to investigate the morphological changes of cubic Ag nanoparticles (NPs) and Ag-based core-shell structures induced by sublimation, as well as the influence of shell coverage on thermal stability. It was found that large Ag NPs (>50 nm) showed a three-stage sublimation-induced morphological change, while small Ag NPs (<30 nm) showed a uniform sublimation. The sublimation process of core-shell NPs started at stage II, and the thermal stability was enhanced by carbon shell passivation.
Article
Engineering, Electrical & Electronic
Suprabha S. Sahoo, Dattatray Chadar, Sunita Salunke-Gawali
Summary: Application of dye-sensitized solar cell technique is a cost-effective and eco-friendly method for constructing photosensors. In this study, three charged benzo[alpha]phenoxazine photosensitizers were implemented as effective photosensors. The dyes showed improved photo-sensing activity and MB-2 exhibited the highest photoresponsivity and photodetectivity.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Xiaolei Deng, Ziqing Li, Fa Cao, Enliu Hong, Xiaosheng Fang
Summary: In this study, a woven optoelectronic keyboard consisting of four individual fibrous photodetectors was integrated to achieve higher level of integration. Each photodetector is based on a uniform type-II TiO2/Cs3Cu2I5 heterojunction, providing improved optoelectronic performance. The woven keyboard can perform logic AND/OR operations and identify UV light signals as keyboard input signals.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Amit Kumar Bhunia, Satyajit Saha
Summary: This study focused on the structural and optical properties of chemical precipitation-derived ZnO nanostructures with special shapes, particularly for optoelectronic and photodetection applications. By fabricating a nano-ZnO/p-Si heterojunction photodiode, the research successfully demonstrated well-defined rectifying behavior in UV light detection applications.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Multidisciplinary Sciences
Lalit Goswami, Neha Aggarwal, Pargam Vashishtha, Shubhendra Kumar Jain, Shruti Nirantar, Jahangeer Ahmed, M. A. Majeed Khan, Rajeshwari Pandey, Govind Gupta
Summary: A highly efficient ultraviolet photodetector based on a unique taper-ended GaN-Nanotowers structure was demonstrated. The device exhibited outstanding performance with high photoresponsivity, low dark current, high I-Light/I-Dark ratio, and fast time-correlated transient response upon ultraviolet illumination. The utilization of GaN-Nanotower structures showed potential for fabrication of energy-efficient ultraviolet photodetectors.
SCIENTIFIC REPORTS
(2021)
Article
Physics, Applied
Krishna Pandey, Marcos Perez, Amelia Korveziroska, Uttam Manna, Mahua Biswas
Summary: This study demonstrates the fabrication of TiO2 nanodot films using block copolymer self-assembled nanostructures as a template and a simple solution dipping process. The selective deposition method results in smaller nanodot size compared to the masked deposition method, while the inter-nanodot distance is similar for both methods. The results of this study are useful for the fabrication of different nanostructures with desired morphologies using a simple and cost-effective dipping method.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
P. A. Gonzalez-Ocegueda, A. Herrera-Saucedo, J. G. Quinones-Galvan, C. Valero-Luna, L. Alvarado-Perea, L. Canizales-Davalos, G. Martinez-Guajardo, A. Banuelos-Frias
Summary: A simple and inexpensive methodology for depositing thin films composed of semiconductor TiO2 nanoparticles using a DLP 3D printer was presented in this study. The structural and optical properties of the films were studied using various spectroscopic techniques, and particle size distribution and film thickness were analyzed through SEM micrographs. Single-layer TiO2 thin films were successfully deposited through DLP 3D printing, with potential applications in sensors, energy harvesting, catalysis, hydrogen production, and other UV light applications.
Article
Engineering, Environmental
Yingeng Wang, Zhiming Gong, Yi Zeng, Hongli Zhao, Jingkai Yang
Summary: In this study, a high-performance electrochromic device (ECD) with TNRA@G/PB core-shell nanostructure as the electrode was successfully prepared. The core-shell nanostructure was formed by wrapping graphene and growing Prussian blue on TiO2 nanorod array through a two-step hydrothermal and spin coating method. The existence state of elemental iron and the evolution of the PB growth layer were investigated. A model of K+ diffusion and electron transport in the ECDs was proposed to explain the mechanism of the enhanced electrochromic property of the TNRA@G/PB core-shell nanostructures. Compared to traditional PB film-based ECDs, the TNRA@G/PB core-shell nanostructures achieved a higher optical modulation range and shorter switching time.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Nanoscience & Nanotechnology
Xiaohe Huang, Chunsen Liu, Peng Zhou
Summary: This article reviews the progress of 2D semiconductors in specific electronic applications, discussing channel optimization, contact characteristics, and dielectric integration of ultra-thin high-performance nanosheets for transistor channels. It also examines the applications of 2D semiconductors in specific electronic functions such as computing, memory, and sensing. Furthermore, it discusses the specific applications of functionalized arrays in solving problems that are difficult to solve with bulk materials.
NPJ 2D MATERIALS AND APPLICATIONS
(2022)
Article
Energy & Fuels
Baskaran Raghavendra Babu, Mukannan Arivanandhan, Ramasamy Jayavel
Summary: In this study, a coin cell based on supercapattery was fabricated using nickel cobaltite nanostructures as electrode material. Among the samples, NCO6 exhibited higher specific capacity and better performance stability, maintaining 99% capacity retention and 94% Coulombic efficiency over 10,000 charge-discharge cycles. The quantitative analysis of both capacitive and diffusive contributions provides insight into the energy storage mechanism of the electrode material.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Physics, Applied
Wenyue Wang, Bin Liu, Fangqi Liu, Zixin Yang, Jing Deng, Qiang Yu, Sicong Zhu, Xianping Wang, Jian Wu
Summary: This study reveals the influence of vacancy defects in CsCu2I3 on its electronic properties and investigates its potential application in self-powered and broadband optoelectronic devices.
APPLIED PHYSICS LETTERS
(2023)
Review
Materials Science, Multidisciplinary
Xiwei Zhang, Jiahua Shao, Chenxi Yan, Ruijie Qin, Zhihui Lu, Huijuan Geng, Tongshui Xu, Lin Ju
Summary: MXenes, as a new branch of two-dimensional materials, are recognized for their distinguished and controllable optical and electronic properties, showcasing potential in optoelectronic device applications. This review outlines the unique properties of MXenes and recent advancements in utilizing them in optoelectronic devices, highlighting both challenges and opportunities for future research and development.
MATERIALS & DESIGN
(2021)
Article
Chemistry, Physical
Dinesh C. Sati, A. Dahshan, H. H. Hegazy, K. A. Aly, Pankaj Sharma
Summary: This paper presents a detailed study on the optical and optoelectronic properties of (Ge2S8)100-xTex thin films for optical device fabrication. The refractive index and extinction coefficients were calculated using transmission spectra. The dielectric parameters and nonlinear refractive index were also evaluated. The results show that the addition of higher atomic radius elements Te in the Ge-S system increases the refractive index and third-order susceptibility, making the composition of Ge17.6S70.4Te12 suitable for optical device purposes.
SURFACES AND INTERFACES
(2023)
Review
Engineering, Electrical & Electronic
Wenjie Deng, Congya You, Yongzhe Zhang
Summary: Imaging sensors are critical in light detection applications, and spectral imaging technology is attracting more attention, with emerging strategies based on nanomaterials and nanostructures.
IEEE SENSORS JOURNAL
(2021)
Article
Chemistry, Physical
Amitabha Nath, Naveen Bhati, Bikram Kishore Mahajan, Jayanta Kumar Rakshit, Mitra Barun Sarkar
Summary: This report outlines the fabrication of Ag nanoparticles on In2O3/TiO2 thin film using the SS-GLAD technique, with a subsequent detailed analysis of the improved electrical and optical properties compared to the thin film without Ag nanoparticles. The inclusion of Ag nanoparticles led to a reduction in bandgap energy, higher transmittance, lower reflectance, and increased power conversion efficiency, suggesting promising potential for photovoltaic applications.
Article
Materials Science, Ceramics
Amitabha Nath, Laishram Robindro Singh, Mitra Barun Sarkar
Summary: Ag:TiO2 heterostructured assemblies were fabricated using double-step glancing angle deposition technique and compared with TiO2 nanowires in terms of morphological, structural, and water contact angle measurements. The Ag:TiO2 heterostructured assembly showed higher wettability conversion rate and potential for antifogging and smart surfaces application.
CERAMICS INTERNATIONAL
(2022)
Article
Engineering, Electrical & Electronic
Yen-Pu Chen, Mengwei Si, Bikram Kishore Mahajan, Zehao Lin, Peide D. Ye, Muhammad Ashraful Alam
Summary: Recently, BEOL compatible In2O3 thin-film transistors grown by ALD have achieved high drain current and small threshold voltage shift under stress conditions. The reliability issues of PBTS and HCD, characterized by a two-stage threshold voltage shift, are attributed to electron trapping/trap-generation and hydrogen-assisted formation of donor-traps. The correlation between HCD and PBTS in BEOL-TFTs is due to the stronger vertical field in an ultrathin device.
IEEE ELECTRON DEVICE LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Rahul Raman, Amitabha Nath, Mitra Barun Sarkar
Summary: A zirconium dioxide nanoparticle-based device was fabricated using the glancing angle deposition (GLAD) technique. The device showed improved performance after high-temperature annealing, with lower dark current density, enhanced light current density, maximum responsivity, enhanced internal gain, maximum detectivity, and low noise equivalent power. This annealed ZrO2 NP-based device can be used to improve photodetection.
IEEE ELECTRON DEVICE LETTERS
(2022)
Article
Physics, Multidisciplinary
Amitabha Nath, Amanisha Chakraborty, Abhijit Das, Laishram Robindro Singh, Mitra Barun Sarkar
Summary: The study demonstrated that post-annealing can improve the surface wettability of Ag/In2O3 thin films, transitioning from hydrophilic to superhydrophilic. The annealed samples exhibited better switching features, making them potential candidates for smart tiles, antifogging, and self-cleaning surface applications.
BRAZILIAN JOURNAL OF PHYSICS
(2022)
Article
Crystallography
Debajit Deb, Bikram Kishore Mahajan
Summary: In this study, modeling of phonon and defect-induced spin relaxation length (L-S) in Fe3O4 and organic semiconductor (OSC) Alq(3) has been demonstrated. The results show that L-S of Alq(3) decreases with enhanced disorder and film thickness at a low film width regime. An exponential change of L-S at low width regime is found for Alq(3) but not for Fe3O4, indicating comparable spin-dependent scattering and L-S in Fe3O4. L-S also decreases with spin-flip probability for both Alq(3) and Fe3O4. Voltage-dependent tunnel magnetoresistance (TMR) response in Fe3O4/Alq(3)/Co and LSMO/Alq(3)/Co hybrid magnetic tunnel junction (MTJ) devices is attributed to modified spin filter effect across magnetic/OSC junction at high bias regime. TMR reduction with Alq(3) thickness for Fe3O4 device is attributed to spin relaxation at the organic spacer layer. A low bias peak from differential TMR indicates spin-polarized injection for both MTJ devices. Enhanced in-plane spin transfer torque for both MTJ devices is associated with modified spin filtering at magnetic/OSC junctions. Lower TMR signal for LSMO device indicates reduced tunneling and enhanced carrier injection across the OSC, which is also supported by the band structure profile. The TMR response observed from simulation results matches well with previously reported experimental results. Higher TMR response for Fe3O4 device indicates the possibility of device employment in room temperature magnetic recording applications.
Article
Engineering, Electrical & Electronic
Avijit Dalal, Ankita Bebarta, Argha Deep Paul, Rabindranath Barman, Jean-Michel Nunzi, Alexey Tameev, Rajat Mahapatra, Aniruddha Mondal
Summary: We developed a three-terminal ion-sensitive device (TTISD) as a sensor for the detection of glucose and arsenic dissolved in water. The device was fabricated using the e-beam evaporation and glancing angle deposition (GLAD) technique. The TiO2 nanowires (NWs) were grown by GLAD on the conducting nafion channel of the TTISD to immobilize the test specimens. This work presents a nano-hybrid platform for the detection of low-concentration glucose and high-concentration arsenic in drinking water, with a rapid response time of approximately 1 second.
IEEE SENSORS JOURNAL
(2023)
Article
Physics, Applied
Ankita Choudhury, Arka Dey, Chiranjib Ghosh, Avijit Dalal, Rajat Mahapatra, Saikat Biswas, Nilanjan Halder, Aniruddha Mondal
Summary: Glancing angle deposition is used to synthesize undoped and Mg-doped GeO2 nanowires with different Mg concentrations. The morphology and crystallinity of the materials are examined through microscopic images and selected area electron diffraction (SAED) patterns. The introduction of Mg affects the crystallinity, leading to a transition from polycrystalline to amorphous structure. The presence of Mg is confirmed through Fourier transmission spectrum analysis. The electrical behavior of Au/undoped GeO2 devices follows the thermionic emission process, while the conductance of Mg-GeO2 devices decreases with increasing temperature due to the positive temperature coefficient of resistance caused by random grain boundaries and electron trapping at the junction.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Ratul Kumar Baruah, Bikram Kishore Mahajan, Sujay Routh
Summary: In this study, a double-gate junctionless SiC FET with an embedded P+ pocket in the oxide layer (P+-SiCJLT) is investigated for high-temperature and high-voltage applications. The P+-SiCJLT exhibits better performance compared to a device of similar dimensions without the P+ layer (SiCJLT), as it allows for efficient volume depletion, improves current ratios, enhances intrinsic gain, and enables enhancement-mode operation.
JOURNAL OF ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Kripasindhu Karmakar, Arka Dey, Subhendu Dhibar, Rajib Sahu, Subham Bhattacharjee, Priya Karmakar, Priyajit Chatterjee, Aniruddha Mondal, Bidyut Saha
Summary: A unique strategy for synthesizing a supramolecular metallogel using zinc ions and adipic acid in DMF medium was established at room temperature. Rheological analysis, field emission scanning electron microscopy, and transmission electron microscopy were used to investigate the mechanical and morphological characteristics of the supramolecular Zn(ii)-metallogel. The electrical conductivity of the metallogel-based device, which exhibited a hexagonal shape, was explored and found to be 7.38 x 10(-5) S m(-1). The device showed semiconductor properties, specifically a Schottky barrier diode nature.
Article
Physics, Multidisciplinary
Rajib Kumar Nanda, Amitabha Nath, Laishram Robindro Singh, Mitra Barun Sarkar
Summary: The surface wettability of self-cleaning surfaces has attracted attention in nanomaterial fabrication. In this study, glancing angle deposition technique was used to fabricate titanium oxide nanowires on a silicon substrate. Gold thin film was deposited on top of the nanowires and subjected to annealing. The sample morphology was characterized using various microscopy techniques, and the surface roughness was examined by atomic force microscopy analysis. The results showed improved characteristics of the annealed nanowire samples, indicating their potential for applications in smart tiles, anti-fogging, and self-cleaning surfaces.
BRAZILIAN JOURNAL OF PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Abhijit Das, Amitabha Nath, Shuvam Pawar, Naorem Khelchand Singh, Mitra Barun Sarkar
Summary: This report discusses the improved photosensing characteristics of a silver nanoparticles (Ag NP) textured aluminum oxide (Al2O3) thin film (TF) device using the glancing angle deposition (GLAD) technique. The device, synthesized on n-Si substrates using electron beam evaporation, was characterized morphologically and crystallographically using various techniques. The Ag NP/Al2O3 TF-based device showed a two-fold improvement in photocurrent, as well as enhanced photosensitivity, barrier height, detectivity, and noise equivalent power compared to the bare Al2O3 TF device. Additionally, the Ag NP/Al2O3 TF device exhibited faster photosensing performances. These improved parameters make the Ag NP/Al2O3 TF device suitable for efficient and fast-switching photosensing applications.
JOURNAL OF NANOPARTICLE RESEARCH
(2023)
Proceedings Paper
Engineering, Multidisciplinary
Bikram Kishore Mahajan, Yen-Pu Chen, Ulisses Alberto Heredia Rivera, Rahim Rahimi, Muhammad Ashraful Alam
Summary: This paper focuses on the long-term integrated degradation of LDMOS transistors under radiation and proposes a universal degradation model. By conducting experiments and numerical simulations, a hot carrier degradation model is introduced to explore the physical origin of defects, and it is demonstrated that this model can be applied to other LDMOS devices as well.
2022 IEEE INTERNATIONAL RELIABILITY PHYSICS SYMPOSIUM (IRPS)
(2022)
Proceedings Paper
Engineering, Multidisciplinary
Bikram Kishore Mahajan, Yen-Pu Chen, Muhammad Ashraful Alam, Dhanoop Varghese, Srikanth Krishnan, Vijay Reddy
Summary: This paper investigates the issue of Hot Carrier Degradation (HCD) in LDMOS transistors, determining the physical mechanism through TCAD modeling. The capability of the Super Single Pulse Charge Pumping (SPCP-P-2) technique to extract N-IT(x) is demonstrated, and the spatial and temporal evolution of N-IT(x,t) is quantified and compared with TCAD predictions. Key differences between experimental and TCAD approaches are identified, and possible physical mechanisms are suggested.
2022 IEEE INTERNATIONAL RELIABILITY PHYSICS SYMPOSIUM (IRPS)
(2022)
