Article
Chemistry, Physical
Salih Ozbay, Nursev Erdogan, Fuat Erden, Merve Ekmekcioglu, Busra Rakop, Mehtap Ozdemir, Gulnur Aygun, Lutfi Ozyuzer
Summary: ITO, ZTO, AZO, and Ag are commonly used in multilayer thin films of transparent conducting oxide (TCO)/metal/TCO electrodes, with critical knowledge of surface free energy (SFE) being important for designing desirable TCO-based sandwich structures. Contact angle measurements of different liquids were used to evaluate the wettability properties of TCO, Ag interlayer, and TCO/Ag/TCO. The results showed that the SFE components varied depending on the TCO type, the total SFE values of TCO/Ag/TCO films were lower than TCO films, and AZO/Ag adhesion was stronger than other TCO/Ag structures.
APPLIED SURFACE SCIENCE
(2021)
Review
Biochemistry & Molecular Biology
Hong Yong Sohn, Arun Murali
Summary: This article reviews and summarizes recent work in this laboratory on the synthesis of advanced transparent conducting oxide nanopowders using plasma. The process involves selecting suitable precursors, injecting them into a non-transferred thermal plasma, vaporizing them, and forming nanosized oxide particles through vapor-phase reactions. The thermal plasma process shows great potential as an efficient technique for synthesizing oxide nanopowders.
Article
Chemistry, Physical
Ke-Ding Li, Po-Wen Chen, Kao-Shuo Chang
Summary: In this study, two different transparent conducting oxides (TCOs), ITO and IZTO, were compared for their transparent conducting films fabrication processes at different temperatures. It was found that IZTO-based ECDs exhibited higher optical transmittance modulation compared to ITO-based ECDs. The investigation also included electrochromic WO3 films deposited on both ITO and IZTO-based ECDs using vacuum cathodic arc plasma (CAP).
Review
Engineering, Electrical & Electronic
Riza Paul, S. Arulkumar, K. Jenifer, S. Parthiban
Summary: Fluorine-doped tin oxide (FTO) or tin-doped indium oxide (ITO) thin films are widely used in CdTe thin-film solar cells, but the higher cost of ITO and lower transmittance of FTO have limited their application. Aluminum-doped zinc oxide (AZO) is a promising alternative due to its earth-abundant nature, but its electrical properties are prone to deterioration under certain conditions. This review proposes that ultra-thin-layer Al-capped AZO thin films could provide high thermal stability without compromising electrical and optical properties, making them suitable for use in CdTe thin-film solar cells.
JOURNAL OF ELECTRONIC MATERIALS
(2023)
Article
Chemistry, Physical
Pamela Machado, Roger Guzman, Ramon J. . Morera, Jordi Alcala, Anna Palau, Wu Zhou, Mariona Coll
Summary: The need for highly performant and stable p-type transparent electrodes based on abundant metals is driving research on perovskite oxide thin films. Cost-efficient and scalable solution-based techniques are being explored to prepare these materials and extract their full potential.
CHEMISTRY OF MATERIALS
(2023)
Review
Optics
Wallace Jaffray, Soham Saha, Vladimir M. Shalaev, Alexandra Boltasseva, Marcello Ferrera
Summary: In recent years, there has been renewed attention in the optics and photonics communities towards transparent conducting oxides (TCOs). TCOs have shown metal-like properties, high optical nonlinearity, and epsilon-near-zero (ENZ) characteristics in the near-infrared spectral range. They have potential applications in transparent electrode fabrication, low-loss plasmonics, and integrated nonlinear optics.
ADVANCES IN OPTICS AND PHOTONICS
(2022)
Article
Polymer Science
Benedict Wen-Cheun Au, Kah-Yoong Chan, Gregory Soon How Thien, Mian-En Yeoh, Mohd Zainizan Sahdan, Hanabe Chowdappa Ananda Murthy
Summary: Over the past few decades, the research on electrochromism has focused on altering the optical transmittance of electrochromic (EC) materials using a small applied voltage. Tungsten oxide (WO3) is commonly used in EC devices (ECDs) to achieve this effect. In this study, WO3 films were produced using a sol-gel spin-coating method, and the influence of various transparent conducting oxides (TCOs) on the construction of ECDs was investigated. The combination of fluorine-doped tin oxide (FTO) and indium-doped tin oxide (ITO) as the TCO and counter electrode, respectively, exhibited the highest coloration efficiency.
Article
Nanoscience & Nanotechnology
I. Hong Ho, Ching-Wen Chang, Yen-Lin Chen, Wan-Yu Chang, Ting-Jui Kuo, Yu-Jung Lu, Shangjr Gwo, Hyeyoung Ahn
Summary: This study successfully grows ultrathin TiN films with excellent surface morphology and high optical transparency using nitrogen plasma-assisted molecular-beam epitaxy (MBE) method. The films exhibit good dielectric properties and electrical conductivity, making them suitable for robust, low cost, and large-area transparent conductive electrodes.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Akhmed K. Akhmedov, Aslan Kh. Abduev, Eldar K. Murliev, Victor V. Belyaev, Abil Sh. Asvarov
Summary: It is possible to fabricate indium zinc oxide (IZO) films with a wide range of optoelectronic properties by using different oxygen contents in the working gas during sputtering deposition. Additionally, high deposition temperature is not necessary to achieve excellent transparent electrode quality in the IZO films. By modulating the oxygen content in the working gas during RF sputtering, IZO-based multilayers were deposited, consisting of ultrathin IZO unit layers with high electron mobility alternating with layers characterized by high concentration of free electrons. Through optimizing the thicknesses of each unit layer, low-temperature 400 nm thick IZO multilayers with excellent transparent electrode quality were obtained, exhibiting low sheet resistance, high transmittance in the visible range, and a very flat multilayer surface.
Article
Chemistry, Multidisciplinary
Yuandi He, Renhuai Wei, Chen Zhou, Wangping Cheng, Xin Ding, Cheng Shao, Ling Hu, Wenhai Song, Xuebin Zhu, Yuping Sun
Summary: It was found that using a precursor solution with a lower metal cation concentration can lead to BLSO thin films with denser microstructures, lower resistivity, higher optical transmittance, and good thermal stability. The highest room-temperature carrier mobility of 53 cm(2) V-1 s(-1) was achieved among all solution-processed donor-doped BaSnO3 thin films. The proposed microstructural engineering offers a sensible and feasible avenue to optimize the optoelectronic performance of transparent conducting thin films.
CRYSTAL GROWTH & DESIGN
(2021)
Article
Physics, Applied
Chih-Yi Liu, Chao-Cheng Lin, Chun-Hung Lai, Shih-Kun Liu, Chang-Sin Ye, Wei-Chen Tien, Meng-Ren Hsu
Summary: Ga-doped ZnO (GZO)/metal/GZO structures were fabricated on glass substrates to serve as transparent conducting layers. The addition of a 1-nm Cu seed layer in the GZO/Ag/Cu/GZO (GACG) structure improved its electrical and optical properties, with good thermal stability demonstrated even after annealing at 300 degrees C for over 5 hours.
INTERNATIONAL JOURNAL OF MODERN PHYSICS B
(2021)
Article
Materials Science, Multidisciplinary
Qais M. Al-Bataineh, Ahmad A. Ahmad, Ihsan A. Aljarrah, Ahmad M. Alsaad, Ahmad Telfah
Summary: This study investigates the impact of hydrogen and nitrogen impurities on the physical properties of transparent conductive oxides. The annealing of (Cu-Ni)/ZnO films under different atmospheres leads to the formation of different defects, resulting in changes in conductivity type and optical properties.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Martando Rath, Moussa Mezhoud, Oualyd El Khaloufi, Oleg Lebedev, Julien Cardin, Christophe Labbe, Fabrice Gourbilleau, Vincent Polewczyk, Giovanni Vinai, Piero Torelli, Arnaud Fouchet, Adrian David, Wilfrid Prellier, Ulrike Luders
Summary: This study investigates the chemical stability of SrVO3 (SVO), a potential replacement for conventional ITO in the new generation of TCO materials. By subjecting the SVO thin films to heat treatments in the range of 150-250 degrees Celsius, the researchers are able to accelerate the natural aging process and observe changes in the structural, electrical, and optical properties. The results indicate surface oxidation at low annealing temperatures and the destruction of the perovskite phase at temperatures above 200 degrees Celsius. The goal of this study is to understand the thermal degradation and long-term stability issues of vanadate-based TCOs and identify technologically viable solutions for their application.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Review
Chemistry, Multidisciplinary
Daniil A. Ilatovskii, Evgeniia P. Gilshtein, Olga E. Glukhova, Albert G. Nasibulin
Summary: This article analyzes the latest research achievements in the optoelectronic performance of transparent conducting films (TCFs) based on single-walled carbon nanotubes (SWCNTs), and briefly reviews various methods for evaluating the performance of transparent electrodes. The article also describes a roadmap for further research and development of transparent conductors using rational design.
Article
Chemistry, Physical
Hui Gong, Ang Li, Guoxing Fu, Meiyu Zhang, Zilong Zheng, Qianqian Zhang, Kailing Zhou, Jingbing Liu, Hao Wang
Summary: In this study, a flexible and ultrathin ion-conducting film (ICF) is proposed for electrochromic applications. The ICF exhibits high transmittance, ionic conductivity, electrochemical window, and mechanical flexibility, making it an excellent candidate for flexible electrochromic devices. This work provides a feasible way for assembling high-performance ECDs for potential applications in displays and wearable electronics.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Energy & Fuels
Facun Jiao, Norikazu Kinoshita, Masato Kawaguchi, Motoyuki Asada, Maki Honda, Keisuke Sueki, Yoshihiko Ninomiya, Dmitry Sergeev, Marc Blaesing, Michael Mueller
Article
Energy & Fuels
Marc Blaesing, Maria Benito Abascal, Yoshihiko Ninorniya, Michael Mueller
Article
Energy & Fuels
Facun Jiao, Norikazu Kinoshita, Masato Kawaguchi, Motoyuki Asada, Maki Honda, Keisuke Sueki, Yoshihiko Ninomiya
Article
Materials Science, Multidisciplinary
Naoomi Yamada, Yuumi Kondo, Ruichiro Ino
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2019)
Article
Materials Science, Multidisciplinary
Peng Wu, Xiang Cao, Thomas Tiedje, Naoomi Yamada
Article
Physics, Applied
Fumio Kawamura, Naoomi Yamada, Xiang Cao, Motoharu Imai, Takashi Taniguchi
JAPANESE JOURNAL OF APPLIED PHYSICS
(2019)
Article
Materials Science, Multidisciplinary
Naoomi Yamada, Yuumi Kondo, Xiang Cao, Yoshitaka Nakano
APPLIED MATERIALS TODAY
(2019)
Article
Chemistry, Multidisciplinary
Naoomi Yamada, Yuta Tanida, Hidenobu Murata, Takahiro Kondo, Shougo Yoshida
ADVANCED FUNCTIONAL MATERIALS
(2020)
Article
Chemistry, Inorganic & Nuclear
Fumio Kawamura, Hidenobu Murata, Masataka Imura, Naoomi Yamada, Takashi Taniguchi
Summary: A novel ternary nitride semiconductor CaSnN2 with a rock-salt-type structure was synthesized, along with the systematic study of II-Sn-N-2 (II = Ca, Mg, Zn) semiconductors. Differences in structure and properties were revealed, showing CaSnN2 and MgSnN2 have band gaps suitable for various applications. These inexpensive and nontoxic semiconductors have potential as replacements for cadmium-based materials in pigments, as well as for InxGa1-xN semiconductors in emitting devices and photovoltaic absorbers.
INORGANIC CHEMISTRY
(2021)
Article
Physics, Applied
Shunichiro Yata, Mari Mizutani, Kaede Makiuchi, Fumio Kawamura, Masataka Imura, Hidenobu Murata, Junjun Jia, Naoomi Yamada
Summary: The charge-carrier transport properties of MgSnN2 films were studied, and it was found that the contribution of grain boundary scattering to electron transport was negligible for films with n(e) > 8 x 10^(20) cm^(-3), but became unignorable with decreasing n(e). The study also determined the conduction-band effective mass for the first time, showing that the conduction-band dispersion may be affected by the cation composition x.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Physics, Applied
Junjun Jia, Takashi Yagi, Mari Mizutani, Naoomi Yamada, Toshiki Makimoto
Summary: The ultrafast transient behavior of InN under intensive laser irradiation is investigated in this study. Using pump-probe techniques, simultaneous measurements of transient transmission and reflectivity reveal the complex transient behavior due to the change in dielectric constant induced by irradiation. The increase in both transient transmission and reflectivity at specific wavelengths is explained by the occupation probability of thermalized electrons and the collective motion of thermalized carriers. The electron-phonon scattering time in InN is estimated to be around 300fs based on the two-temperature model.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Chemistry, Physical
Kaede Makiuchi, Fumio Kawamura, Junjun Jia, Yelim Song, Shunichiro Yata, Hitoshi Tampo, Hidenobu Murata, Naoomi Yamada
Summary: Single-phase MgSnN2 thin films with rocksalt structure were successfully synthesized through high-pressure heat treatment and epitaxial growth. These films show potential as optoelectronic materials for light-emitting diodes and tandem solar cells.
CHEMISTRY OF MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Naoomi Yamada, Mari Mizutani, Kenta Matsuura, Masataka Imura, Hidenobu Murata, Junjun Jia, Fumio Kawamura
Summary: Wurtzite-type MgxZn1-xSnN2 alloys are proposed as promising earth-abundant and tunable band gap semiconductors with the potential to be grown on GaN substrates. These alloys show green-light emissions and can be tuned from 1.5 to 2.3 eV by increasing the composition parameter x. Direct-gap semiconductors with band gaps in the range of 1.8 to 2.5 eV are highly anticipated for the development of green LEDs and high-efficiency tandem solar cells.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Naoomi Yamada, Kenta Matsuura, Masataka Imura, Hidenobu Murata, Fumio Kawamura
Summary: The potential of wurtzite-type MgSnN2 as green emitters in LEDs and absorber material in photovoltaics has been studied, and the electron transport properties can be tailored by varying the cation composition. The Mg1+xSn1-xN2 films with Sn-rich composition exhibited a blue shift in their optical gap, while the intrinsic band gap of MgSnN2 was approximately 2.3 eV.
ACS APPLIED ELECTRONIC MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Takeo Ohsawa, Naoomi Yamada, Akichika Kumatani, Yoshitaka Takagi, Tohru Suzuki, Ryota Shimizu, Susumu Shiraki, Tsutomu Nojima, Taro Hitosugi
ACS APPLIED ELECTRONIC MATERIALS
(2020)
