Article
Chemistry, Multidisciplinary
Inho Song, Liyan You, Ke Chen, Won-June Lee, Jianguo Mei
Summary: Homogeneous chiral electrochromics using chiral assembly of conjugated polymers have been developed through a transient solidification process with molecular chiral templates. The circular dichroism can be tuned by adjusting the doping level of the electrochemically active polymer films. The differential circularly polarized transmission in the chiral see-through display can make a well-resolved color change, demonstrating proof-of-concept devices for information encryption.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Cosmin Romanitan, Ioan Valentin Tudose, Kyriakos Mouratis, Marian Catalin Popescu, Cristina Pachiu, Stelios Couris, Emmanouel Koudoumas, Mirela Suchea
Summary: This study reports the correlation between texture coefficient and electrochromism in vanadium pentoxide nanostructured films. It is found that texture coefficient affects the size of crystalline domains and electrochromic performance, with high texture coefficient facilitating charge insertion and increasing transmittance contrast.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2022)
Article
Engineering, Electrical & Electronic
K. Naveen Kumar, Sheik Abdul Sattar, G. V. Ashok Reddy, R. Imran Jafri, R. Premkumar, M. R. Meera, A. Asrar Ahamed, M. Muthukrishnan, Merum Dhananjaya, Ammar M. Tighezza
Summary: Tungsten oxide (WO3) thin films were prepared using GDMS technique with varied substrate angles and annealing treatments. The structural, optical, and electrochromic properties of the films were characterized using XRD, UV-Vis spectrometer, and electrochemical analyzer. It was found that annealed samples exhibited crystalline structures and lower optical transmittance, while room temperature-deposited samples were amorphous with higher transmittance. The cyclic voltammograms showed that room temperature samples had better coloring/bleaching ability and diffusion coefficient.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Optics
Cesar Carrillo-Delgado, Monica Araceli Vidales-Hurtado, Hilario Martines-Arano, David Torres-Torres, Gina Gallegos-Garcia, Claudia Lizbeth Martinez-Gonzalez, Carlos Torres-Torres
Summary: This article analyzes how an electric field can induce a band gap shift in NiO films to enhance their third-order optical nonlinearities. It suggests that an electrochromic effect is responsible for changes in absorbance and modification in off-resonance nonlinear refractive index. The optical Kerr effect is identified as the main physical mechanism in a nanosecond two-wave mixing configuration at 532 nm wavelength. The absence of multi-photon absorption is confirmed by the constant trace of high-irradiance optical transmittance in single-beam mode. The study of nonlinear optical signals allows the proposal of an exclusive disjunctive logic gate assisted by an electrochromic effect in an optical Kerr gate. The influence of a switchable probe beam transmittance and electrical signals on asymmetric encryption by the XOR system is also studied. Immediate applications for developing multifunctional quantum systems driven by dynamic parameters in electrochromic and nonlinear optical materials are emphasized.
Article
Materials Science, Ceramics
Yangbiao Liu, Jixi Wang, Xiudi Xiao, Xuesong Cai, Guizhang Sheng, Gang Xu
Summary: Metal-doping is an effective method for adjusting the properties of semiconductor metal oxides. In this study, Mo-doped tungsten oxide nanoparticles were synthesized using a solvothermal method, resulting in high-performance electrochromic films on ITO glass. Mo doping improved the electrochemical activity, optical properties, and conductivity of the films.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Physical
Ofelia Durante, Veronica Granata, Rosalba Fittipaldi, Joshua Neilson, Giovanni Carapella, Francesco Chiadini, Riccardo DeSalvo, Roberta De Simone, Franco Dinelli, Vincenzo Fiumara, Vincenzo Pierro, Innocenzo Mario Pinto, Antonio Vecchione, Fabrizio Bobba, Cinzia Di Giorgio
Summary: The influence of thermal treatments in different gaseous environments on the structural transformations of granular TiO2 thin films was investigated. Crystallization temperature as low as 150°C for anatase and 250°C for rutile was achieved. The combination of granular morphology and oxygen vacancies was proposed to tune the phase transitions. Phonon confinement-like effect and crystallization kinetics of low-dimensional anatase-TiO2 was explored.
SURFACES AND INTERFACES
(2023)
Article
Engineering, Electrical & Electronic
F. Azimi Dalenjan, M. M. Bagheri-Mohagheghi, A. Shirpay
Summary: In this study, WO3:Ni and WO3:Co20 at.%:Ni thin films were deposited on glass substrates using pyrolysis spray technique. The effect of Ni impurities on the structural, morphological, optical and electrochromic properties of the thin films was investigated. The results showed that the grain size increased with increasing Ni impurity and the electrochromic behavior improved. The addition of Ni impurities also resulted in a decrease in the energy band gap.
OPTICAL AND QUANTUM ELECTRONICS
(2022)
Article
Chemistry, Physical
Pritam J. Morankar, Rutuja U. Amate, Ganesh T. Chavan, Aviraj M. Teli, Dhanaji S. Dalavi, Chan-Wook Jeon
Summary: Electrochromic (EC) smart windows with large areas, low cost, durability, and multi-functionality were developed using potentiostatically electrodeposited WO3 thin films. The fabricated EC device showed high optical modulation, excellent Li-ion diffusion coefficient, and reversible performance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Immunology
Yong Jun Park, Deokyeon Lee, Kwang-Mo Kang, Sumin Choi, Minkyung Shin, Seung Ho Han, Il Heo, Ho Seong Jang, Yoon-Chae Nah, Dong Hun Kim
Summary: This article investigates the properties of Ag nanoparticle-incorporated electrochromic WO3 thin films. The films with higher Ag concentration showed merged particles and a single or polycrystalline phase, while films with lower Ag concentration had a random distribution of small nanoparticles. Surface plasmon resonance peaks in the absorption spectra confirmed the formation of metallic nanoparticles. The W0.91Ag0.09O3-delta thin film exhibited faster switching time, higher coloration efficiency, and black coloration, indicating the achievement of color neutrality through Ag nanoparticle incorporation.
INTERNATIONAL IMMUNOPHARMACOLOGY
(2023)
Article
Optics
G. V. Ashok Reddy, Habibuddin Shaik, K. Naveen Kumar, V. Madhavi, Hitha D. Shetty, Sheik Abdul Sattar, Merum Dhananjaya, B. Daruka Prasad, G. Ranjith Kumar, B. H. Doreswamy
Summary: This study presents the fabrication of TiO2 nanorods/WO3 hybrid thin films and investigates their electrochromic behavior. WO3 thin films were deposited at a constant temperature with varying oxygen partial pressures, while tungsten nanorods were grown on FTO coated glass substrates using a hydrothermal process. The optimized WO3 films were then coated on the TiO2 nanorod film. Material, optical, electrical, and electro-chemical analysis were conducted on the films. The enhanced coloration efficiency of the optimized WO3 films was attributed to their large active surface area, which facilitated H+ ions intercalation. The TiO2 nanorods/WO3 hybrid films exhibited good electrochemical properties, including a diffusion coefficient of 1.8 x 10-7 cm2/s, better than pure WO3 and TiO2 nanorods.
Article
Materials Science, Multidisciplinary
Kazuki Tajima, Takashi Kubota, Chan Yang Jeong
Summary: Spin coating is a commonly used method for coating resist solutions and fabricating functional thin films. In this study, electrochromic WO3 thin films were successfully prepared using a spin coater with humidity control. The controlled humidity resulted in a doubled film thickness compared to direct deposition during the rainy season in Japan. The humidity control also enabled the control of film thickness and function during deposition.
Article
Chemistry, Physical
Yong Jun Park, Kwang-Mo Kang, Ji Ho Kang, Seung Ho Han, Ho Seong Jang, Ja Yeon Lee, Tae-Sik Yoon, Yoon-Chae Nah, Dong Hun Kim
Summary: This article reports on the control of interface morphology degradation between acid-based electrolytes and electrochromic WO3 thin films by stacking Nb2O5 layers to develop highly sustainable and durable electrochromic devices. The microstructure of the thin film did not significantly change when Nb2O5 layers were stacked on the WO3 layers. The electrochromic performance of the bilayer thin films critically depended on the stacking order and thickness of each layer, with the 100nm thick Nb2O5/200nm thick WO3 stack exhibiting enhanced performance compared to the 300nm thick single-layer WO3 film.
APPLIED SURFACE SCIENCE
(2022)
Article
Nanoscience & Nanotechnology
Junji Guo, Xing Guo, Huibin Sun, Yizhu Xie, Xungang Diao, Mei Wang, Xiping Zeng, Zhi-Bin Zhang
Summary: The study introduces a low-cost, eco-friendly hybrid cation electrolyte for amorphous metal oxides to exhibit excellent optical performance, addressing issues related to structural stability and cycling lifetime.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Materials Science, Multidisciplinary
Beyza Yedikardes, Mustafa Altun, Esra Zayim
Summary: WO3 doped P3HT hybrid thin films were synthesized by a simple solution blending doping method. The optimum concentration of 30 wt% of WO3 was found to improve electrochromic efficiency by 110% and provide long-term cyclability and environmental stability.
Article
Materials Science, Multidisciplinary
Ocal Tuna, Ali Kemal Mak, Osman Ozturk, Mevlut Karabulut
Summary: In this study, Nickel oxide (NiO) thin films were grown on glass substrate by direct current magnetron sputtering at different oxygen (O2) partial pressure. The influence of O2 partial pressure on the structural, optical, and electrochromic properties of NiO thin films were investigated. The results showed a strong relation between O2 partial pressure and various properties of the NiO films, and optimizing the O2 partial pressure led to the highest electrochromic efficiency.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
R. Blake Nuwayhid, Angelique Jarry, Gary W. Rubloff, Keith E. Gregorczyk
ACS APPLIED MATERIALS & INTERFACES
(2020)
Article
Materials Science, Multidisciplinary
Brenton A. Noesges, Tiancong Zhu, Jacob J. Repicky, Sisheng Yu, Fengyuan Yang, Jay A. Gupta, Roland K. Kawakami, Leonard J. Brillson
PHYSICAL REVIEW MATERIALS
(2020)
Article
Nanoscience & Nanotechnology
Micah S. Haseman, Brenton A. Noesges, Seth Shields, John S. Cetnar, Amber N. Reed, Hayder A. Al-Atabi, James H. Edgar, Leonard J. Brillson
Article
Physics, Applied
Geoffrey M. Foster, Andrew Koehler, Mona Ebrish, James Gallagher, Travis Anderson, Brenton Noesges, Leonard Brillson, Brendan Gunning, Karl D. Hobart, Francis Kub
APPLIED PHYSICS LETTERS
(2020)
Article
Polymer Science
Matthew D. Widstrom, Oleg Borodin, Kyle B. Ludwig, Jesse E. Matthews, Sahana Bhattacharyya, Mounesha Garaga, Arthur Cresce, Angelique Jarry, Metecan Erdi, Chunsheng Wang, Steven Greenbaum, Peter Kofinas
Summary: The newly developed polymer and water-in-salt electrolyte, with enhanced Li+ transport and extended electrochemical stability, shows great potential for commercial application in lithium-ion batteries.
Article
Materials Science, Coatings & Films
Jun Zhang, Kyle McNicholas, Snjezana Balaz, Zhao Quan Zeng, Darrell Schlom, Leonard J. Brillson
Summary: Intrinsic point defects in complex oxides can strongly affect electronic properties, and their density distributions, energy levels, and optical transitions can be measured using depth-resolved spectroscopy techniques. These defects are sensitive to factors such as growth temperature, mechanical strain, crystal orientation, and chemical interactions, and their spatial redistribution near surfaces and interfaces can vary significantly, leading to strong electronic effects. The combination of deep level spectroscopies with other advanced characterization techniques provides a pathway to further expand the understanding and control of complex oxide defects.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2021)
Article
Physics, Applied
Daram N. Ramdin, Micah S. Haseman, Hsien-Lien Huang, Kevin D. Leedy, Jinwoo Hwang, Leonard J. Brillson
Summary: Iridium is a common impurity in the edge-defined film-fed growth method for producing high-power Ga2O3 device structures, but its effects on carrier transport and recombination have not been fully explored. After nitrogen rapid thermal annealing, the optical and electronic nature of iridium in Ga2O3 and at Ir/Ga2O3 interfaces change on a near-nanometer to micrometer scale, influencing defect-assisted tunneling, diode rectification, and electric field strength preservation. Various measurement techniques reveal the diffusion and impact of iridium in crystal growth, providing insights for improving device performance.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Materials Science, Coatings & Films
Brenton A. Noesges, Daesu Lee, Jung-Woo Lee, Chang-Beom Eom, Leonard J. Brillson
Summary: This study investigates the interplay of defects and electronic structure at the interfaces of SrxTiO3/SrTiO3 films. Understanding and controlling these defects are crucial for enhancing the performance of oxide devices.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2022)
Article
Physics, Applied
Micah S. S. Haseman, Daram N. N. Ramdin, Wenshen Li, Kazuki Nomoto, Debdeep Jena, Huili Grace Xing, Leonard J. J. Brillson
Summary: This study investigates the movement of electrically charged defects in Ga2O3 vertical trench power diodes using cathodoluminescence point spectra and hyperspectral imaging. The researchers observed the spatial rearrangement of optically active defects under strong reverse bias. These findings demonstrate the potential impact of extreme electric fields on atomic rearrangement and local doping changes in beta-Ga2O3, highlighting the importance of nanoscale device geometry in other high-power semiconductor devices.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Nanoscience & Nanotechnology
Micah S. Haseman, Hantian Gao, Kalpak Duddella, Leonard J. Brillson
Summary: We measured the movement of intrinsic point defects in ZnO nano- and micro-wires driven by electric fields and observed their impact on the electrical properties of the wires. The results explain the instability in nanowire transport and demonstrate a new method for refining and processing ZnO nanowires. These findings highlight the importance of in-operando intrinsic point-defect migration during nanoscale electric field measurements.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Kil Ho Lee, Brenton A. Noesges, Chris McPherson, Faiz Khan, Leonard J. Brillson, Jessica O. Winter
Summary: This study investigated the fluorescence stability of quantum dots (QDs) encapsulated in block co-polymer (BCP) micelles under different synthesis methods and polymer structures. The fluorescence intensity of QDs passivated using charged BCPs was found to be lower than those passivated using neutral groups, due to surface oxidation of Cd to CdO. The fluorescence losses were higher in processes with slow formation speed, but minimized in the presence of poly(vinyl alcohol) (PVA) surfactant. The results suggest that the polymer coating method and BCP structure influence the oxidation of QDs during phase transfer.
Article
Chemistry, Physical
Mitchell J. Walker, Angelique Jarry, Nick Pronin, Jake Ballard, Gary W. Rubloff, Leonard J. Brillson
JOURNAL OF MATERIALS CHEMISTRY A
(2020)