Article
Optics
T. U. Tumkur, R. Sokhoyan, M. P. Su, A. Ceballos-Sanchez, G. Kafaie Shirmanesh, Y. Kim, H. A. Atwater, E. Feigenbaum, S. Elhadj
Summary: Nanophotonic materials offer unprecedented control of light-matter interactions, with gold showing the best laser damage resistance; alternative materials like transparent conducting oxides could be optimized for a balance between damage resistance and optical tunability; future studies should focus on damage mitigation and ruggedization strategies for applications requiring high power beam manipulation.
Article
Chemistry, Physical
T. Roch, M. Gregor, S. Volkov, M. Caplovicova, L. Satrapinskyy, A. Plecenik
Summary: This study examined the impact of different substrates on the structure and orientation of niobium nitride thin films, revealing that films on C-Al2O3 substrate exhibited the best superconducting properties.
APPLIED SURFACE SCIENCE
(2021)
Article
Engineering, Electrical & Electronic
Andrii Torgovkin, Aki Ruhtinas, Ilari J. Maasilta
Summary: In this study, normal metal-insulator-superconductor (NIS) tunnel junctions were fabricated using superconducting titanium nitride grown by pulsed laser deposition (PLD). The tunnel junction devices were successfully fabricated using electron beam lithography and shadow evaporation techniques. Further optimization of the direct oxidation process may lead to potential applications in electric cooling.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2021)
Article
Materials Science, Coatings & Films
M. Escalona, H. Bhuyan, S. Ibacache, M. J. Retamal, P. Saikia, C. Borgohain, J. C. Valenzuela, F. Veloso, M. Favre, E. Wyndham
Summary: By combining a conventional PLD system with dual RF discharge, a PE-PLD system was created to grow TiN thin films and control the nitrogen concentration and deposition rate. Studies have shown that significant increase in nitrogen concentration and deposition rate can be achieved by adjusting RF plasma parameters.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Energy & Fuels
Ju-Guang Hu, Tong Wu, Muhammad Ishaq, Umar Farooq, Shuo Chen, Zhuang-Hao Zheng, Zheng-Hua Su, Xiao-Dong Lin, Ping Fan, Hong-Li Ma, Xiang-Hua Zhang, Guang-Xing Liang
Summary: The CZTS thin-film solar cell achieved a record power conversion efficiency of 6.62% through pulsed laser deposition and sulfurization process, attributed to its optimized structure and composition. This research provides a facile and robust preparation method for CZTS films with enhanced photovoltaic properties and increased efficiency.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2021)
Article
Physics, Applied
Abhijit Biswas, Mingfei Xu, Kai Fu, Jingan Zhou, Rui Xu, Anand B. Puthirath, Jordan A. Hachtel, Chenxi Li, Sathvik Ajay Iyengar, Harikishan Kannan, Xiang Zhang, Tia Gray, Robert Vajtai, A. Glen Birdwell, Mahesh R. Neupane, Dmitry A. Ruzmetov, Pankaj B. Shah, Tony Ivanov, Hanyu Zhu, Yuji Zhao, Pulickel M. Ajayan
Summary: This article reports on the growth of ultrawide-bandgap boron nitride thin films on wide-bandgap gallium nitride and confirms their characteristics. The study demonstrates the second-harmonic generation property of the BN/GaN heterostructure and fabricates a Schottky diode with improved performance based on this structure.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Physical
Stefan Andrei Irimiciuc, Sergii Chertopalov, Maksym Buryi, Zdenek Remes, Martin Vondracek, Ladislav Fekete, Michal Novotny, Jan Lancok
Summary: CuI thin films were deposited with controlled morphology, structure, and defect nature in different Ar atmospheres. Band gap tailoring was achieved by controlling the plasma ion kinetic energy. Variation in Ar pressure allowed control over the nature of vacancies. Addition of Ar resulted in preferential scattering and energy losses of Cu ions in the plasma.
APPLIED SURFACE SCIENCE
(2022)
Article
Materials Science, Coatings & Films
Jiqiang Jia, Chen Liu, Mengjiao Guo, Li Lei
Summary: This study reports the epitaxial growth process of negative-type high-temperature superconducting thin film Nd1.85Ce0.15CuO4 (NCCO) by pulsed laser deposition. The results show that a good superconducting phase can be prepared from NCCO films only when the heat treatment temperature is higher than 650°C. The optimal oxygen pressure and deoxidization temperature for phase formation and the superconductivity of NCCO films are also determined.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2022)
Article
Materials Science, Multidisciplinary
Leonid Yu. Beliaev, Evgeniy Shkondin, Andrei V. Lavrinenko, Osamu Takayama
Summary: We conducted a comparative study on the optical properties of 50 nm-thick titanium nitride (TiN) films deposited by different methods and process temperatures, and found that films deposited by pulsed-DC sputtering at 600 degrees C showed the best plasmonic response. These results suggest a direct relationship between the stoichiometry, structural quality, and oxygen incorporation in TiN films and their plasmonic properties.
Article
Materials Science, Multidisciplinary
M. Escalona, H. Bhuyan, J. C. Valenzuela, S. Ibacache, E. Wyndham, M. Favre, F. Veloso, H. M. Ruiz, E. Wagenaars
Summary: The study investigates the impact of single and dual radio frequency plasma discharge on the composition and dynamics of a titanium plasma plume. It was found that increasing the RF power enhances the interaction between titanium and nitrogen atoms, which is crucial in titanium nitride film applications. Various techniques, such as time-resolved imaging, optical emission spectroscopy, and interferometry, were utilized to analyze the plasma and obtain important parameters such as temperature and density.
RESULTS IN PHYSICS
(2021)
Article
Materials Science, Ceramics
Jayaraman Senthilselvan, Rajeev R. Pillai, Ramasubramanian Kannan, B. Baskar, Krishna Valleti, J. Manonmani
Summary: In this study, nanocrystalline TiN films were deposited on FTO coated glass substrates by cathodic arc deposition for the first time. The crystalline phase, grain size, hardness, electrical resistivity, and optical properties of the TiN films were investigated. The results showed that the nanocrystalline TiN films had excellent mechanical and electrical properties, making them suitable for use as counter electrodes in dye-sensitized solar cells.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Chang Gao, Yujing Ran, Qian Guo, Tianrun Wang, Huiping Lu, Zhaotan Jiang, Zhi Wang
Summary: NbNx films were prepared by dual ion beam sputter deposition to modulate their structural and dielectric properties. Assisting ions can improve crystallinity, reduce energy loss, and lead to tunable dual epsilon-near-zero behavior in the films. Tailoring plasmonic properties with assisting ions allows NbNx films to be applied in various fields.
SURFACES AND INTERFACES
(2021)
Article
Biotechnology & Applied Microbiology
Crysthal Alvarez, Carla Berrospe-Rodriguez, Chaolumen Wu, Jacqueline Pasek-Allen, Kanav Khosla, John Bischof, Lorenzo Mangolini, Guillermo Aguilar
Summary: Titanium nitride (TiN) is proposed as a potential alternative plasmonic nanomaterial for laser rewarming of cryopreserved biomaterials. TiN nanoparticles (NPs) and clusters demonstrate higher heating rates and solution temperatures, with clusters also significantly improving the uniformity of heating.
FRONTIERS IN BIOENGINEERING AND BIOTECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
G. Bimashofer, S. Smetaczek, E. Gilardi, C. W. Schneider, A. Limbeck, T. Lippert, J. Stahn
Summary: LixLaySrzMnO3 thin films of various compositions were grown using pulsed laser deposition, studying the effects of deposition temperature, target-to-substrate distance, and deposition pressure on the film's composition. The experiments also showed that lithium loss is likely when growing multi-elemental oxide thin films, but specific growth conditions and different target compositions can help achieve the desired film composition.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Chemistry, Physical
Tao Liu, Helei Dong, Hanyu Wang, Yanyan Niu, Xiangpeng Li, Lei Zhang, Jijun Xiong, Qiulin Tan
Summary: In this study, Pt-ITO thin-film thermocouples were fabricated using pulsed laser deposition on alumina ceramic substrates, and the microstructure and electrical properties were investigated. The results showed that the ITO thin films had a new type of nano cone structure, with a resistivity of only 2.76 x 10-4 omega center dot cm at a substrate temperature of 600 degrees C. The Pt-ITO thin-film thermocouples could work stably in the temperature range of 25-1300 degrees C and for a short time at 1400 degrees C. The average Seebeck coefficient was more than 50 mu V/degrees C at 1300 degrees C, and the response time was less than 435 mu s. These findings provide important insights for the potential application of Pt-ITO TFTCs in high-temperature measurement, and confirm the feasibility of preparing superior thermoelectric semiconductor materials using pulsed laser deposition.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
So Hee Kim, Joo Hwan Ko, Young Jin Yoo, Min Seok Kim, Gil Ju Lee, Satoshi Ishii, Young Min Song
Summary: In this study, high-performance Tamm plasmons (TPs) with high Q-factors and absorptance were achieved in sub-micron scale based on a single material, by tailoring the effective refractive index through porosity change. The designed TP structures were experimentally fabricated and combined with a metal-semiconductor-metal photodetector to demonstrate their application as ultra-sensitive narrowband photodetectors.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Chemistry, Physical
Aufandra Cakra Wardhana, Sou Yasuhara, Min-Wen Yu, Akira Yamaguchi, Tadaaki Nagao, Satoshi Ishii, Masahiro Miyauchi
Summary: This study elucidated a unique interfacial charge transport pathway between Cr2O3 and SrTiO3, shedding light on the development of efficient visible-light-sensitive photocatalysts. Kelvin probe force microscopy measurements confirmed a negative shift in surface potential difference of the Cr2O3 thin film during visible-light irradiation, indicating electron excitation from the valence band of Cr2O3 to the conduction band of SrTiO3.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Chemistry, Multidisciplinary
Satoshi Ishii, Min-Wen Yu, Kuo-Ping Chen, Tadaaki Nagao
Summary: This study experimentally demonstrates that non-metallic plasmonic material zirconium nitride (ZrN) can generate electric potential through plasmoelectric effect, providing possibilities for robust photoelectric devices working at off-resonances.
ADVANCED MATERIALS INTERFACES
(2023)
Article
Optics
Pooja Thakkar, Clement Fleury, Gerald Stocker, Florian Dubois, Thang Duy Dao, Reyhaneh Jannesari, Parviz Saeidi, Gerald Puehringer, Thomas Ostermann, Thomas Grille, Bernhard Jakoby, Andreas Tortschanoff, Cristina Consani
Summary: Non-dispersive infrared (NDIR) absorption spectroscopy is a widely used method for gas sensing due to its selectivity and conceptual simplicity. The design and fabrication of microstructures, specifically waveguides, that can combine high sensitivity with ease of integrability of other sensor elements is a major challenge for fully integrated NDIR sensors. In this study, we investigate a class of coupled strip-array (CSA) waveguides on a SiO2/Si3N4 platform, fabricated using mass semiconductor processes, and demonstrate their comparable sensitivity for various geometries, making it a promising platform for meeting multiple sensor and fabrication requirements without sacrificing performance.
Article
Chemistry, Multidisciplinary
T. K. N. Nguyen, F. Grasset, S. Cordier, N. Dumait, S. Ishii, H. Fudouzi, T. Uchikoshi
Summary: The electrophoretic deposition and photonic crystal structural engineering were used to study the light absorption and electronic conduction properties of a tin pyrophosphate semiconductor integrated with a hexamolybdenum cluster compound (Mo6 cluster). The size of the pores, surface modification, and chemical composition of the infiltration material in the inverse opal film were investigated to control the photonic bandgap and deposition efficiency of the Mo6 cluster. The photoactive Mo6 clusters acted as visible light harvesters, generating efficient photo-induced current through a slow photon effect at the edges of the photonic stopband.
MATERIALS TODAY CHEMISTRY
(2023)
Article
Optics
Nicholaus Kevin Tanjaya, Keiichiro Toda, Takuro Ideguchi, Satoshi Ishii
Summary: Quantitative phase microscopy (QPM) is used in this study to determine the thermal conductivity and thermo-optic coefficient (TOC) of a transparent substrate. By measuring the phase difference induced by an external heating laser, the thermal conductivity and TOC are simultaneously extracted through modeling based on heat transfer and thermo-optic effect. The method shows potential for measuring thermal conductivities and TOCs of other transparent substrates and has advantages in terms of setup simplicity and modeling ease.
Article
Materials Science, Multidisciplinary
Satoshi Ishii, Nicholaus K. Tanjaya, Evgeniy Shkondin, Shunsuke Murai, Osamu Takayama
Summary: By varying the geometric parameters, the optical absorption and thermal conductivity of silicon hole and pillar arrays can be optimized. The thermal conductivity has a stronger influence on the photothermal heating effect than optical absorption. Pillar arrays exhibit a larger photothermal heating effect, while hole arrays are advantageous in applications requiring connectivity. This study provides guidance for the future design of periodic nanostructures for photothermal heating applications.
APPLIED MATERIALS TODAY
(2023)
Article
Energy & Fuels
Satoshi Ishii, David Hernandez-Pinilla, Nicholaus K. Tanjaya, Tadaaki Nagao
Summary: Passive radiative cooling during the day can be achieved with highly reflective sunlight and thermal radiation in the mid-infrared region. In this study, the low ultraviolet reflectance of a silver film is compensated by combining it with a distributed Bragg reflector (DBR) made of silica and tantalum dioxide multilayers. The samples exhibited high solar reflectance (0.987) and thermal emittance (0.852), and the addition of a polymer improved the thermal emittance (0.926) with a slight decrease in solar reflectance (0.007). Outdoor measurements confirmed the radiative cooling performance of the samples in summer.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2023)
Article
Chemistry, Multidisciplinary
Barun Kumar Barman, David Hernandez-Pinilla, Ovidiu Cretu, Riichiro Ohta, Keiko Okano, Toshifumi Shiroya, Jun Sasai, Koji Kimoto, Tadaaki Nagao
Summary: This study reveals that polymeric carbon dots have a spongy, porous structure with uniform element distribution and effectively resist self-quenching of photoluminescence in the solid state. By embedding them in a planar microcavity, a single longitudinal solid-state blue laser is developed.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Keisuke Watanabe, Hemam Rachna Devi, Masanobu Iwanaga, Tadaaki Nagao
Summary: This study demonstrates vibrationally coupled silicon metasurfaces formed on silicon-on-insulator wafers, showing tunability from weak to strong coupling regimes. The coupling conditions are tailored by engineering the radiative losses of quasi-bound states in the continuum to maximize the enhanced molecular signals, providing a new route for surface-enhanced infrared spectroscopy using complementary metal-oxide-semiconductor compatible all-dielectric materials.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Physical
Min-Wen Yu, Yu-Tang Lin, Chia-Hung Wu, Tung-Jung Wang, Jhuang-Hao Cyue, Jun Kikkawa, Satoshi Ishii, Tien-Chang Lu, Kuo-Ping Chen
Summary: This work successfully controlled the number of sulfur vacancies in monolayer WS2 flakes synthesized by chemical vapor deposition (CVD), resulting in a difference in photoluminescence (PL) intensity. The sulfur vacancies introduce defect trap states that cause carrier recombination and reduce carrier drift to graphene, thus decreasing the photocurrent. Furthermore, the gate-tunable Fermi level of graphene allows tunable responsivity of the WS2-graphene photodetector.
APPLIED SURFACE SCIENCE
(2024)
Article
Nanoscience & Nanotechnology
Nicholaus Kevin Tanjaya, Manpreet Kaur, Tadaaki Nagao, Satoshi Ishii
Summary: The heat transfer properties of plasmonic titanium nitride (TiN) coated anodic aluminum oxides (AAOs) were studied. Samples with pore sizes in the range of 161-239 nm exhibited high optical absorptance and photothermal heating efficiency, with the sample with a pore size of 239 nm performing the best.
