論文 Fabrication of ZnO-encapsulated porous alumina structure utilizing a two-step anodizing technique for memristor applications JJAP,in press 2023(Sep. 15) Author:Myo Than Htay Yamamoto, Yoshito Ishihara, Yoshio Hashimoto
Experimental Validation of Switching Dependence of Nanoscale-Y2O3 Memristor on Electrode Symmetry via Physical Electro-Thermal Modeling ACS Applied Electronic Materials,5(7):3885-3893 2023(Jul.) Author:Mohit Gautam, Sanjay Kumar, Sumit Chaudhary, Lokesh Hindoliya, Dhananjay Kumbhar, Jun Hong Park, Myo Than Htay, Shaibal Mukherjee
Impact of ZnO Cap Layer on the Performance of MgZnO/CdZnO Heterostructure with Y2O3 Spacer Layer IEEE Transactions on Electron Devices,69(11):5991-5995 2022(Sep. 23) Author:Pawan Kumar, Sumit Chaudhary, Md Arif Khan, Ruchi Singh, Myo Than Htay, Rahul Prajesh, Ajay Agarwal, Shaibal Mukherjee
Cu2ZnSnS4 thin-film solar cells by a closed tube sulfurization under saturated sulfur vapor pressure Jpn J. Appl. Phys.,61:095508-1-095508-6 2022(Aug.) Author:Myo Than Htay, Osamu Imai, Kazutomo Kosaka, Noritaka Momose, Yoshio Hashimoto Abstract:The CdS/Cu2ZnSnS4 (CZTS) heterojunction thin-film solar cells were fabricated via a closed tube sulfurization under saturated sulfur vapor pressure. A significant improvement in the crystalline quality of the CZTS polycrystalline thin film was achieved when the Cu-Zn-Sn metallic-alloy thin film was sulfurized under saturated sulfur vapor pressure of 4.3atm at 590°C due to efficient suppression of re-evaporation of Zn and Sn species during the growth process. Accordingly, the open circuit voltage and short circuit current density of the CdS/CZTS heterojunction device were enhanced resulting in the improvement of power conversion efficiency over 1.7 times compared to the best cell fabricated by the conventional processes under unsaturated sulfur vapor pressure of 1.5 atm.
Large and Uniform Single Crystals of MoS2 Monolayers for ppb-level NO2 Sensing ACS Applied Nano Materials,5(7):9415-9426 2022(Jun. 29) Author:Chandrabhan Patel, ruchi singh, Mayank Dubey, Sushil Pandey, Shrish Upadhyay, Vikash Kumar, Sharath Sriram, Myo Than Htay, Srimanta Pakhira, Victor Atuchin, Shaibal Mukherjee
Influence of Substrate Temperature and Sulfurization on Sputtered Cu2SnGe(S,Se)3 Thin Films for Solar Cell Application IEEE Transactions on Electron Devices,69(5):2488-2493 2022(May) Author:Mayank Dubey, Gaurav Siddharth, Ruchi Singh, Chandrabhan Patel, Sanjay Kumar, Myo Than Htay, Victor V. Atuchin, and Shaibal Mukherjee
Annealing effect of absorber layer on SnS/CdS heterojunction band alignments JJAP,61:SB1042 2022(Feb.) Author:Ashenafi Abadi, Myo Than Htay, Yoshio Hashimoto, Kentaro Ito, Noritaka Momose
S, N Co-Doped Carbon Dot-Functionalized WO3 Nanostructures for NO2 and H2S Detection ACS Applied Nano Materials,5(2):2492-2500 2022(Jan. 25) Author:Patel, Chandrabhan; Mandal, Biswajit; Jadhav, Rohit; Ghosh, Tapas; Dubey, Mayank; Das, Apurba; Than Htay, Myo; Atuchin, Victor; Mukherjee, Shaibal
Optimization of dual ion beam sputtered MQWs for solar cell IEEE 48th Photovoltaic Specialists Conference (PVSC),:0392-0394 2021(Jun.) Author:G. Siddharth, R. Singh, M. Dubey, M. T. Htay and S. Mukherjee
Photocatalytic and Photoelectrochemical Hydrogen Evolution from Water over Cu2SnxGe1-xS3 Particles Journal of the American Chemical Society,143:5698-5798 2021(Mar.) Author:Yosuke Kageshima, Sota Shiga, Tatsuki Ode, Fumiaki Takagi, Hiromasa Shiiba, Myo Than Htay, Yoshio Hashimoto, Katsuya Teshima, Kazunari Domen, Hiromasa Nishikiori Abstract:Journal of the American Chemical Society
Investigation of DIBS-deposited CdZnO/ZnO-based Multiple Quantum Well for Large-area Photovoltaic Application IEEE Trans. Electron Devices,67(12):5587-5592 2020(Dec.) Author:Gaurav Siddharth, Ruchi Singh, Vivek Garg, Brajendra S. Sengar, Mangal Das, Biswajit Mandal, Myo Than Htay, Mukul Gupta, Shaibal Mukherjee Abstract:IEEE Trans. Electron Devices
Drain Current Optimization in DIBS-grown MgZnO/CdZnO HFET IEEE Trans. Electron Devices,67(6):2276-2281 2020(Jun.) Author:Md Arif Khan, Pawan Kumar, Mangal Das, Myo Than Htay, Ajay Agarwal, Shaibal Mukherjee Abstract:IEEE Trans. Electron Devices
Impact of Interfacial SiO2 on Dual Ion Beam Sputtered Y2O3-based Memristive System IEEE Trans. Nanotechnology,19:332-337 2020(Apr. 20) Author:Mangal Das, Amitesh Kumar, Sanjay Kumar, Biswajit Mandal, Gaurav Siddharth, Pawan Kumar, Myo Than Htay, and Shaibal Mukherjee Abstract:IEEE Trans. Nanotechnology
Effects of Na2S treatment and post-annealing on Sn-rich Cu2ZnSnS4-based thin-film solar cells Jpn. J. Appl. Phys.,59:SCCD03 2020(Feb. 01) Author:Noritaka Momose, Myo Than Htay, Naoki Mikoshiba, Yoshio Hashimoto, and Kentaro Ito Abstract:Jpn. J. Appl. Phys.
CZTS thin film solar cells utilizing sulfurization of metallic precursors Jpn. J. Appl. Phys.,59:SCCD05 2020(Feb. 01) Author:Kentaro Ito, Takayuki Nagata, Myo Than Htay, Noritaka Momose, and Yoshio Hashimoto Abstract:Jpn. J. Appl. Phys.
Effect of Sb doping in pure phase SnS thin films Jpn. J. Appl. Phys.,59:SCCB11 2020 Author:Ashenafi Abadi; Myo Than Htay; Yoshio Hashimoto; Kentaro Ito; Noritaka Momose Abstract:Jpn. J. Appl. Phys.
Architecture tailoring of MoO3 nanostructures for superior ethanol sensing performance Materials Research Bulletin,109:281-290 2019(Jan.) Author:Biswajit Mandal; Aaryashree; Mangal Das; Myo Than Htay; Shaibal Mukherjee Abstract:Materials Research Bulletin
π-Conjugated Amine-ZnO Nanohybrids for the Selective Detection of CO2 Gas at Room Temperature ACS Applied Nano Materials,1(12):6912-6921 2018(Nov. 27) Author:Biswajit Mandal; Ankan Biswas; Aaryashree, Daya; Shankar Sharma; Ritesh Bhardwaj; Mangal Das; Md Ataur Rahman; Sruthi Kuriakose; Madhu Bhaskaran; Sharath Sriram; Myo Than Htay; Apurba K. Das; Shaibal Mukherjee Abstract:ACS Applied Nano Materials
Defect Control in MoO3 Nanostructures as Ethanol Sensor 2018 IEEE SENSORS,(18329606):1-3 2018(Oct.) Author:Biswajit Mandal; Aaryashrec; Ritesh Bhardwaj; Mangal Das; Daya Shankar Sharma; Myo Than Htay; Shaibal Mukherjee Abstract:2018 IEEE SENSORS
Impact of Schottky Junctions in the Transformation of Switching Modes in Amorphous Y2O3-based Memristive System Journal of Physics D: Applied Physics,51:315102 2018(Jul. 11) Author:Mangal Das; Amitesh Kumar; Biswajit Mandal; Myo Than Htay; Shaibal Mukherjee Abstract:Journal of Physics D: Applied Physics
Temperature-dependent Raman Spectroscopy of Cu2Sn1-xGexS3 Thin Films JJAP,57(8S3):08RC12 2018(Jul. 10) Author:Takayoshi Okamura; Myo Than Htay; Kohei Yamaguchi; Noriyuki Urakami; Noritaka Momose; Kentaro Ito; Yoshio Hashimoto Abstract:JJAP
Two dimensional electron gases in MgZnO/ZnO and ZnO/MgZnO/ZnO heterostructures grown by dual ion beam sputtering Journal of Physics D: Applied Physics,51:13LT02 2018(Mar. 08) Author:Rohit Singh; Md Arif Khan; Pankaj Sharma; Myo Than Htay; Abhinav Krant; Shaibal Mukherjee
Realization of synaptic learning and memory functions in Y2O3 based memristive device fabricated by dual ion beam sputtering Nanotechnology,29(5):055203 2018(Jan. 05) Author:Mangal Das; Amitesh Kumar; Rohit Singh; Myo Than Htay; Shaibal Mukherjee Abstract:Single synaptic device with inherent learning and memory functions is demonstrated based on a forming-free amorphous Y2O3 (yttria) memristor fabricated by dual ion beam sputtering system. Synaptic functions such as nonlinear transmission characteristics, long-term plasticity, short-term plasticity and 'learning behavior (LB)' are achieved using a single synaptic device based on cost-effective metal-insulator-semiconductor (MIS) structure. An 'LB' function is demonstrated, for the first time in the literature, for a yttria based memristor, which bears a resemblance to certain memory functions of biological systems. The realization of key synaptic functions in a cost-effective MIS structure would promote much cheaper synapse for artificial neural network.
Synthesis and Characterization of Antimony Doped SnS2 (SnS2: Sb)Thin Films Proceedings of 8th ICSE2017,:864-867 2017(Dec. 10) Author:Ashenafi Abadi; Myo Than Htay; Yoshio Hashimoto; Kentaro Ito; Noritaka Momose Abstract:Proceedings of 8th ICSE2017
Forming-free high-endurance Al/ZnO/Al memristor fabricated by dual ion beam sputtering APPLIED PHYSICS LETTERS,110(25):253509 2017(Jun.) Author:Amitesh Kumar; Mangal Das; Vivek Garg; Brajendra S. Sengar; Myo Than Htay; Shailendra Kumar; Abhinav Kranti; Shaibal Mukherjee Abstract:We report dual ion beam sputtering fabrication of an Al/ZnO/Al memristor displaying forming-free bipolar resistive switching characteristics with memristive behavior without necessitating any post-processing steps. A nearly amorphous ZnO thin film and an appropriate concentration of oxygen vacancies play a significant role in imparting forming-free, stable, and reliable behavior to memory cells. Besides, sufficient non-lattice oxygen ions in the film play a crucial role in the resistive switching process. The AlOx interface layer is observed to strongly affect the switching mechanism in the memory device by altering the barrier at the Al/ZnO interface. The device shows stable switching behavior for >250 cycles with good retention and stable set/reset voltages. Published by AIP Publishing.
Controlling the Morphology of ZnO:Al Nanowires Grown by Ultrasonic Spray Pyrolysis The Proceeding of the Seventh International Conference on Science and Engineering (ICSE 2016),EP02:488-492 2016(Dec. 10) Author:Sai Myo Than Htay; Yoshio Hashimoto Abstract:The Proceeding of the Seventh International Conference on Science and Engineering (ICSE 2016)
Effect of ultrasonically generated water vapor treatment on the Cu2ZnSnS4/CdS heterojunction-based photovoltaic cells SOLAR ENERGY MATERIALS AND SOLAR CELLS,157:765-776 2016(Dec.) Author:Myo Than Htay; Ryosuke Fujimura; Remi Hasuike; Kazushi Takei; Noritaka Momose; Yoshio Hashimoto; Kentaro Ito Abstract:The surface treatment of Cu2ZnSnS4 thin films was carried out by utilizing ultrasonically generated water vapor. Suppression of the unintentional fluctuation of chemical composition near the heterointerface and enhancement in the homogeneity of CdS deposition on the Cu2ZnSnS4 thin films were observed in the samples with water vapor treatment at the temperatures between 250 degrees C and 350 degrees C. The effect on the variation of conduction band and valence band offsets at the Cu2ZnSnS4/CdS heterojunction, which was observed to be in a staggered alignment, was less than +/- 50 meV due to the treatment. Reproducibility of the cell characteristics was improved by the H2O spray treatment of the Cu2ZnSnS4 absorbers before the deposition of CdS buffer layers. At treatment temperature of 300 degrees C, the improvement of efficiency by about 25% compared to that of the untreated samples was achieved. (C) 2016 Elsevier B.V. All rights reserved.
Selective chemical etching of the impurity phases existing in Cu2ZnSnS4 thin films The 6th International Symposium on Technology for Sustainability,2016.1:161-165 2016(Oct.) Author:Tetsu Miyashita; Noritaka Momose; Myo Than Htay; Yoshio Hashimoto; Kentaro Ito Abstract:The 6th International Symposium on Technology for Sustainability
Current Trends on the Development of Thin-Films Photovoltaic Cells Based on Kesterite Semiconductors The Proceeding of the Sixth International Conference on Science and Engineering (ICSE 2015),EC-06:5 pages 2015(Dec. 12) Author:Myo Than Htay; Yoshio Hashimoto Abstract:The Proceeding of the Sixth International Conference on Science and Engineering (ICSE 2015)
Influence of Ge composition in the Cu2Sn1-xGexS3 thin-film photovoltaic absorber prepared by sulfurization of laminated metallic precursor SOLAR ENERGY MATERIALS AND SOLAR CELLS,140:312-319 2015(Sep.) Author:Myo Than Htay; Takahiro Mandokoro; Hiroaki Seki; Takanori Sakaizawa; Noritaka Momose; Toshinori Taishi; Yoshio Hashimoto; Kentaro Ito Abstract:Cu2Sn1-xGexS3 thin-film absorbers are prepared by sulfurization of laminated precursors. The crystal grain size is enhanced under higher growth temperature and/or sulfur pressure. By the XRD and Raman analyses, the crystal alloy is considered to be composed of majority monoclinic phase with minority secondary phase such as Cu-2(Sn1-xGex)(3)S-7 throughout the whole Ge/(Ge+Sn) composition range. The optical band gap is observed to be varied between 0.94 eV and 1.30 eV in relation with the Ge contents. A photovoltaic conversion efficiency of about 2% is obtained in the sample utilizing Cu2Sn0.6Ge0.4S3 absorber. (C) 2015 Elsevier B.V. All rights reserved.
Field emission property of ZnO nanowires prepared by ultrasonic spray pyrolysis SUPERLATTICES AND MICROSTRUCTURES,84:144-153 2015(Aug.) Author:Myo Than Htay; Yoshio Hashimoto Abstract:The field emission property of cold cathode emitters utilizing the ZnO nanowires with various conditions prepared by ultrasonic spray pyrolysis technique was discussed. It is found that the emission current was enhanced in the emitters having higher aspect ratio as well as smaller sheet resistance. Applying of post-annealing process, utilization of additional Mo back electrode in the cathode, and coating of Moon the ZnO nanowires resulted in the improvement of the emission current and lowering the threshold voltage. A threshold voltage of about 5.5 V/mu m to obtain 1.0 mu A/cm(2) was achieved in the sample prepared at the growth temperatures varying continuously from 250 degrees C to 300 degrees C. (C) 2015 Elsevier Ltd. All rights reserved.
Properties of Cu2Sn1-xGexS3Based Thin-film Photovoltaic Absorber Technical Digest of the 6th World Confrence on Photovoltaic Energy Conversion (WCPEC-6),3WePo.5.16:429-430 2014(Nov. 26) Author:Myo Than Htay; Takahiro Mandokoro; Hiroaki Seki; Noritaka Momose; Toshinori Taishi; Yoshio Hashimoto; Kentaro Ito Abstract:Technical Digest of the 6th World Confrence on Photovoltaic Energy Conversion (WCPEC-6)
Synthesis of a cuprite thin film by oxidation of a Cu metal precursor utilizing ultrasonically generated water vapor THIN SOLID FILMS,556:211-215 2014(Apr.) Author:Myo Than Htay; Masahiko Okamura; Ryo Yoshizawa; Yoshio Hashimoto; Kentaro Ito Abstract:A Cu2O thin film of cuprite crystal structure was fabricated via a decomposition reaction of water vapor generated by ultrasonic vibration. The thin film, which was grown on a soda-lime glass substrate at 530 degrees C, exhibited a prominent (111) preferred orientation with an optical bandgap of about 2.1 eV and resistivity of 2.81 x 10(4) Omega cm. Generation of H-2 gas during the reaction process contributed to suppressing the growth of impurity tenorite phase. In a conventional process of thermal oxidation, the formation of the cuprite phase was always accompanied by that of the tenorite phase due to an excess oxygen exposure near the surface of the films. (C) 2014 Elsevier B.V. All rights reserved.
A Simple Approach in Estimating the Effectiveness of Adapting Mirror Concentrator and Tracking Mechanism for PV Arrays in the Tropics INTERNATIONAL JOURNAL OF PHOTOENERGY,2014:341863 2014 Author:M. E. Ya'acob; H. Hizam; H. Abdul Rahman; W. Z. Wan Omar; Myo Than Htay; A. H. M. A. Rahim Abstract:Mirror concentrating element and tracking mechanism has been seriously investigated and widely adapted in solar PV technology. In this study, a practical in-field method is conducted in Serdang, Selangor, Malaysia, for the two technologies in comparison to the common fixed flat PV arrays. The data sampling process is measured under stochastic weather characteristics with the main target of calculating the effectiveness of PV power output. The data are monitored, recorded, and analysed in real time via GPRS online monitoring system for 10 consecutive months. The analysis is based on a simple comparison of the actual daily power generation from each PV generator with statistical analysis of multiple linear regression (MLR) and analysis of variance test (ANOVA). From the analysis, it is shown that tracking mechanism generates approximately 88 Watts (9.4%) compared to the mirror concentrator which generates 144 Watts (23.4%) of the cumulative dc power for different array configurations at standard testing condition (STC) references. The significant increase in power generation shows feasibilities of implying both mechanisms for PV generators and thus contributes to additional reference in PV array design.
Calculating electrical and thermal characteristics of multiple PV array configurations installed in the tropics ENERGY CONVERSION AND MANAGEMENT,75:418-424 2013(Nov.) Author:M. Effendy Ya'acob; Hashim Hizam; Myo Than Htay; M. Amran M. Radzi; Tamer Khatib; M. Bakri A Abstract:This study intends to define the electrical characteristics and temperature equations of PV array installed in the tropics based on Sandia National Laboratory (SNL) model. Ten units of 1 kW rated PV array namely Fixed Flat (FF), Tracking Flat (TF) and Concentrating (CPV) have been installed at Universiti Putra Malaysia (UPM), Serdang District, Malaysia at the coordinate of 2 degrees 59'20 '' N:101 degrees 43'30 '' E with tropical-based ground conditions. Electrical characteristics are the main elements of contributions where five operating conditions for CEEG PV Module are applied based on the SNL model to produce array parameter values. It is found that FF array projects the highest operating value of 12.06 A (I-sc), 11.55 A (I-mp), 524.78 V (V-oc), 89.5 V (V-mp), and 1033.7 W (P-mp) with good regression fit and strong correlation R-2 of more than 0.5. The versatility and accuracy of this work have been validated and applied for three different types of PV array system installed in the equatorial doldrum spot of uniform temperature-irradiance, high in humidity-rainfall and generally light wind field conditions. The parameters are calculated using filtered field data sampled at STC of 5% tolerance. Focal point of calculating array temperature (T-array) as means of thermal effect on multiple PV array configurations is highlighted based on recent study on T-c equations and Generalized Extreme Value (GEV) analysis using field data at site. (C) 2013 Elsevier Ltd. All rights reserved.
Cu2ZnSn(SxSe1-x)(4) Thin-Film Solar Cells Utilizing Simultaneous Reaction of a Metallic Precursor with Elemental Sulfur and Selenium Vapor Sources APPLIED PHYSICS EXPRESS,5(8):081201 2012(Aug.) Author:Noritaka Momose; Myo Than Htay; Kazuki Sakurai; Shota Iwano; Yoshio Hashimoto; Kentaro Ito Abstract:A Cu2ZnSn(SxSe1-x)(4) (CZTSSe) solid alloy was prepared by reacting a metallic precursor with sulfur and selenium in a closed tube simultaneously. It was confirmed that the CZTSSe alloy could be synthesized over the whole compositional range and its lattice transformation was in good agreement with Vegard's law. The crystal grain size and electrical conductivity were enhanced when the selenium content was increased. In a CdS/CZTSSe heterojunction solar cell, the photovoltaic efficiency was improved due to the enhancement of the short-circuit current in accordance with the narrowing of the optical bandgap of the CZTSSe absorber. (c) 2012 The Japan Society of Applied Physics
金属積層プリカーサーの硫化法によるCu2ZnSnS4薄膜太陽電池の作製 第8回「次世代の大陽光発電システム」シンポジウム,C1:121 2011(Jun.) Author:Myo Than Htay、石橋加津彦、石上翔太、櫻井一輝、岩野翔太、中村義博、橋本佳男、伊東謙太郎
A Cadmium-Free Cu2ZnSnS4/ZnO Hetrojunction Solar Cell Prepared by Practicable Processes JAPANESE JOURNAL OF APPLIED PHYSICS,50(3):0323011-0323014 2011(Mar.) Author:Myo Than Htay; Yoshio Hashimoto; Noritaka Momose; Kouichi Sasaki; Hiroshi Ishiguchi; Shigeo Igarashi; Kazuki Sakurai; Kentaro Ito Abstract:A cadmium-free Cu2ZnSnS4/ZnO hetrojunction solar cell with conversion efficiency of 4.29% has been obtained. The Cu2ZnSnS4 absorber film was formed utilizing sulfurization of laminated metallic precursors, and the ZnO buffer layer was then deposited on it by ultrasonic spray pyrolysis. In comparison with a conventional Cu2ZnSnS4/CdS hetrojunction solar cell, the open circuit voltage as well as the relative quantum efficiency at the short-wavelength regions was increased. The in-plane homogeneity of p-n junction was improved by depositing the ZnO layer on Cu2ZnSnS4 film via ultrasonic spray pyrolysis. (C) 2011 The Japan Society of Applied Physics
Cu2ZnSnS4 Thin Film Solar Cells Utilizing Sulfurization of Metallic Precursor Prepared by Simultaneous Sputtering of Metal Targets JAPANESE JOURNAL OF APPLIED PHYSICS,50(1):01BG091-01BG094 2011(Jan.) Author:Noritaka Momose; Myo Than Htay; Takuto Yudasaka; Shigeo Igarashi; Takuro Seki; Shota Iwano; Yoshio Hashimoto; Kentaro Ito Abstract:Cu2ZnSnS4 (CZTS) thin films were prepared by simultaneous sputtering of metallic targets and sulfurizing a metallic precursor under elemental sulfur atmosphere in a sealed tube. Subsequently, they were applied to the fabrication of thin film solar cells. The precursors with desired compositional ratio and thickness were obtained by controlling the area ratio of sputtering targets and also sputtering parameters. We have succeeded in obtaining high-quality polycrystalline CZTS thin films by sulfurization under a sulfur vapor pressure higher than atmospheric pressure. A CZTS-based solar cell with 3.7% conversion efficiency was obtained from CZTS films sulfurized at 590 degrees C for 7 min. (c) 2011 The Japan Society of Applied Physics
Position-selective growth of ZnO nanowires by ultrasonic spray pyrolysis JOURNAL OF CRYSTAL GROWTH,311(20):4499-4504 2009(Oct.) Author:Myo Than Htay; Yoshio Hashimoto; Noritaka Momose; Kentaro Ito Abstract:Position-selective growth of ZnO nanowires was realized by utilizing a patterned soda-lime glass layer. The soda-lime glass layer contributes as the origin of nucleation sites for the growth of nanowires in economically viable ultrasonic spray pyrolysis technique. The formation of nanowires took place with good reproducibility at relatively low substrate temperatures of 250-400 degrees C when the soda-lime glass matrix was present at the surface of substrates, and such a nitrate compound as nitric acid or nitrate salt was mixed in the precursor solutions. Based on this technique, the position-selective growth and density-controlled growth of ZnO nanowires can be performed on various types of substrate. The presence of a CaO compound in the glass matrix was revealed as an important condition to grow the nanowires. (C) 2009 Elsevier B.V. All rights reserved.
Synthesis of optical quality ZnO nanowires utilizing ultrasonic spray pyrolysis JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS,20(1):341-345 2009(Jan.) Author:Myo Than Htay; Yuji Tani; Yoshio Hashimoto; Kentaro Ito Abstract:ZnO nanowires were grown by an ultrasonic spray pyrolysis technique. The aspect ratio and size of the wire were dependent mainly on the pH value of a precursor solution and the growth temperature. By high-resolution transmission electron microscopic analysis and photoluminescence measurements, it was confirmed that the nanowires are monocrystalline with good optical quality.
Photoluminescence properties and morphologies of submicron-sized ZnO crystals prepared by ultrasonic spray pyrolysis JAPANESE JOURNAL OF APPLIED PHYSICS,47(1):541-545 2008(Jan.) Author:Myo Than Htay; Minoru Itoh; Yoshio Hashimoto; Kentaro Ito Abstract:Spectral features of the near-band-edge photoluminescence (PL) of submicron-sized ZnO crystals such as nanoplatelets, nanowires, and nanorods grown by an ultrasonic spray pyrolysis (USP) technique were investigated. The measurements of time-integrated and time-resolved PL spectra were performed in the temperature range of 8 - 300 K under various excitation densities by using the fourth harmonies (4.66 eV) of a Nd:YAG laser. Exciton-related emission bands were clearly observed in the ZnO crystals having different morphologies. In nanoplatelets, an emission band originating from radiative recombination of donor-acceptor pairs was a] so found at around 3.17 eV, indicating the existence of acceptor centers. The binding energies of donor and acceptor were about 53 and 200meV, respectively. In nanowires, the intensity of an emission band peaking at 3.32eV obeyed a quadratic dependency on the density of excitation. This fact shows that an inelastic exciton-exciton scattering process is efficient in the nanowires because of high crystal quality.
Growth of ZnO submicron single-crystalline platelets, wires, and rods by ultrasonic spray pyrolysis JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS,46(1):440-448 2007(Jan.) Author:Myo Than Htay; Yoshio Hashimoto; Kentaro Ito Abstract:Submicron single crystals of ZnO were grown by spray pyrolysis: the mist of an aqueous solution was generated by ultrasonic agitation and then pyrolyzed on a heated glass substrate. Hexagonal platelets of ZnO 10-90nm thick were obtained when ammonium acetate was incorporated into the precursor solution of zinc acetate. Single-crystalline wires and rods, which were 50-150 and 300-4000nm thick respectively, were obtained when indium nitrate was co-incorporated into the solution as a metal catalyst. The crystallographic direction of wires and rods was parallel to one of the [0001], [10 (1) over bar0], or [11 (2) over bar] axis of wurtzite. As substrate temperature increased, the aspect ratio of the crystal thus tended to decrease. Structural and compositional analyses of these crystals were performed by scanning electron microscopy, scanning ion microscopy, transmission electron microscopy and electron diffraction, X-ray diffraction, X-ray photoelectron spectrocopy, and energy dispersive X-ray spectroscopy.
Morphological and quantum analysis of Cu2SnGe(S,Se)3 thin films for photovoltaic application EMNANO2023 2023(Jun. 06) Presenter:Mayank Dubey, Chandrabhan Patel, Sumit Chaudhary, Myo Than Htay, Shaibal Mukherjee
Novel 2D transition metal dichalcogenide based memory crossbar for realtime image processing using conventional computing paradigm EMNANO2023 2023(Jun. 06) Presenter:Chandrabhan Patel, Kumari Jyoti, Mayank Dubey, Myo Than Htay, Shaibal Mukherjee
Fabrication of memristors based on ZnO encapsulated porous alumina utilizing two-steps anodizing technique EMNANO2023 2023(Jun. 06) Presenter:Yoshito Ishihara, Myo Than Htay, Yoshio Hashimoto
Cu2Zn(Sn,Ge)(S,Se)4 thin films prepared by sulfo-selenization of Cu-Zn-GeSn co-sputtered precursor EMNANO2023 2023(Jun. 06) Presenter:Noritaka Momose, Myo Than Htay, Ryuki Saito, Yoshio Hashimoto
Analysis of Cut-off and Maximum Oscillation Frequency of Oxide HEMT with MgO Spacer Layer Organic and Inorganic Electronics Symposium: O&I Symposium 2022(Jun. 11) Presenter:Sumit Chaudhary, Pawan Kumar, Kumari Jyoti, Myo Than Htay and Shaibal Mukherjee
Role of alkaline halides on MoS2 monolayer growth via CVD Organic and Inorganic Electronics Symposium: O&I Symposium 2022(Jun. 11) Presenter:Chandrabhan Patel, Ranjan Kumar, Myo Than Htay, and Shaibal Mukherjee
陽極酸化アルミナを用いたメモリスタの作製 2022年第69回応用物理学会春季学術講演会 2022(Mar. 24) Presenter:木下友起、石原嘉人、Myo Than Htay、橋本佳男
Fabrication of memristors based on ZnO nano pillars encapsulated in porous alumina EMNANO-2021 2021(Jun. 02) Presenter:Tomoki Kinoshita, Myo Than Htay, Yoshio Hashimoto Abstract:EMNANO-2021
Annealing effect of absorber layer on SnS/CdS heterojunction EMNANO-2021 2021(Jun. 02) Presenter:Ashenafi Abadi, Myo Than Htay, Yoshio Hashimoto, Kentaro Ito, Noritaka Momose Abstract:EMNANO-2021
Stability enhancement of Cu2S by Ag incorporation EM-NANO 2019 2019(Jun. 22) Presenter:Tatsunori Isobe; Myo Than Htay; Kentaro Ito; Yoshio Hashimoto Abstract:EM-NANO 2019
Optimization of Cu2Sn1-xGexS3 thin films fabricated by a feasible two-steps reaction process of metallic precursors EM-NANO 2019 2019(Jun. 22) Presenter:Jin Koumura; Myo Than Htay; Noritaka Momose; Kentaro Ito; Yoshio Hashimoto
Electrolyzed-water treatment of Cu2SnS3absorber thin films EM-NANO 2019 2019(Jun. 22) Presenter:Maya Minamikawa; Myo Than Htay; Noritaka Momose; Kentaro Ito; Yoshio Hashimoto Abstract:EM-NANO 2019
Effects of Na2S treatment and post-annealing of Cu2ZnSnS4-based thin-film solar cells EM-NANO 2019 2019(Jun. 22) Presenter:Noritaka Momose; Myo Than Htay; Naoki; Mikoshiba; Yoshio Hashimoto; Kentaro Ito
Effect of temperature and light insolation on electrolyzed-water battery EM-NANO 2019 2019(Jun. 22) Presenter:Kazuma Yazawa; Myo Than Htay; Yoshio Hashimoto Abstract:EM-NANO 2019
Effect of temperature and light insolation on electrolyzed-water battery EM-NANO 2019 2019(Jun. 22) Presenter:Kazuma Yazawa, Myo Than Htay, Yoshio Hashimoto
Cu2(Sn,Si)S3-based thin-film solar cells prepared by closed-tube sulfurization of Cu-Sn-Si co-sputtered films EM-NANO 2019 2019(Jun. 22) Presenter:Noritaka Momose; Myo Than Htay; Masaki Aida; Yu Watanabe; Yoshio Hashimoto; Kentaro Ito Abstract:EM-NANO 2019
CZTS thin film solar cells prepared by sulfurization of stacked elemental metal precursor layers EM-NANO 2019 2019(Jun. 22) Presenter:Kentaro Ito; Shohta Ishigami; Takayuki Nagata; MyoThan Htay; Noritaka Momose; Yoshio Hashimoto Abstract:EM-NANO 2019
Effect of Sb Doping in Pure Phase SnS Thin Film EM-NANO 2019 2019(Jun. 21) Presenter:Ashenafi Abadi; Myo Than Htay; Yoshio Hashimoto; Kentaro Ito; Noritaka Momose Abstract:EM-NANO 2019
Effect of Roughness on the Resistive Switching of Yttrium Oxide-Based System EM-NANO 2019 2019(Jun. 21) Presenter:Mangal Das; Sanjay Kumar; Md. ArifKhan; Biswajit Mandal; Myo ThanHtay; Shaibal Mukherje Abstract:EM-NANO 2019
Yttrium oxide based resistive switching device for synaptic applications 6th Nano Today Conference, Lisbon, Portugal 2019(Jun. 20) Presenter:Sanjay Kumar; Mangal Das; Amitesh Kumar; Myo Than Htay; Shaibal Mukherjee Abstract:6th Nano Today Conference, Lisbon, Portugal
Current Trends of Research on Thin-Films Solar Cells utilizing Cu2Sn1-xGexS3 Absorber International Conference on Computational Mathematics in Nanoelectronics and Astrophysics CMNA2018 2018(Nov. 02) Presenter:Myo Than Htay Abstract:International Conference onComputational Mathematics in Nanoelectronics and Astrophysics CMNA2018
Preparation of Ge doped Cu2ZnSn(S,Se)4 Absorber Thin Films EMNANO-2017 2017(Jun. 20) Presenter:Daiki Miyazawa; Mitsuki Shinohara; Noritaka Momose; Myo Than Htay; Yoshio Hashimoto; Kentaro Ito Abstract:EMNANO-2017
Preparation of Cu2(Sn,Si)S3 Thin-film Solar Cells by Cu-Sn-Si Simultaneous Sputtering EMNANO-2017 2017(Jun. 20) Presenter:Masaki Aida; Yusuke Wakui; Noritaka Momose; Myo Than Htay; Yoshio Hashimoto; Kentaro Ito
MoSi2/Mo Back Electrode Structures for CZTS-based Thin-film Solar Cells The 3rd International Conference of Global Network for Innovative Technology 2016(Jan. 27) Presenter:N. Momose; K. Matsubasyashi; M. T. Htay; Y. Hashimoto; K. Ito Abstract:The 3rd International Conference of Global Network for Innovative Technology
Effect of Solar Insolation on a Self-Biased In2O3/H2O/Al Photoelectrochemical Cell EMNANO-2015 2015(Jun. 18) Presenter:Mitsuaki Ito; Myo Than Htay; Noritaka Momose; Yoshio Hashimoto Abstract:EMNANO-2015
Cu2ZnSnS4 Thin-Film Solar Cells Utilizing MoSi2/Mo Back Electrode EMNANO-2015 2015(Jun. 18) Presenter:Kaede Matsubayashi; Noritaka Momose; Myo Than Htay; Yoshio Hashimoto; Kentaro Ito Abstract:EMNANO-2015
Temperature Dependent Raman Spectroscopy Analysis of Cu2SnS3 and Cu2GeS3 Thin-Film Solar Absorbers EMANANO-2015 2015(Jun. 17) Presenter:Myo Than Htay; Yuki Narahara; Takahiro Mandokoro; Takanori Sakaizawa; Noritaka Momose; Yoshio Hashimoto Abstract:EMANANO-2015
Preparation of Cu2(Sn,Si)S3 Alloy Films for Thin-Film Solar Cellsby Sulfurizaiton of Simultaneous Sputtered Cu-Sn-Si precursors EMNANO-2015 2015(Jun. 17) Presenter:Yusuke Wakui; Noritaka Momose; Myo Than Htay; Yoshio Hashimoto; Kentaro Ito Abstract:EMNANO-2015
Thin-film Solar Cells Based on Cu2ZnSn(SxSe1-x)4 Absorber Prepared by Reaction of Cu-Zn-Sn Alloy with Vapor of Sulfur and Selenium Mixture EM-NANO 2013 2013(Jun. 19) Presenter:Noritaka Momose; Myo Than Htay; Yuki Arai; Ryutaro Arai; Yoshio Hashimoto; Kentaro Ito Abstract:EM-NANO 2013
Preparation of Cu2(SnxGe1-x)S3 Thin-film Alloys by Sulfurization and their Photovoltaic Properties EM-NANO 2013 2013(Jun. 19) Presenter:Takahiro Mandokoro; Myo Than Htay; Noritaka Momose; Toshinori Taishi; Yoshio Hashimoto; Kentaro Ito Abstract:EM-NANO 2013
超音波噴霧熱分解法を用いたZnO 透明電極の作製 2009(Oct.) Presenter:安松洋; Myo Than Htay; 但馬義典; 橋本佳男; 伊東謙太郎
超音波噴霧熱分解法を用いたZnO ナノワイヤーの圧電素子応用 2009(Oct.) Presenter:但馬義典; Myo Than Htay; 橋本佳男; 伊東謙太郎
冷陰極への応用を目指したZnOナノ構造の作製 2009(Oct.) Presenter:田中孝典; Myo Than Htay; 橋本佳男; 伊東謙太郎
低温酸化による太陽電池用Cu2O 薄膜の作製 2008(Nov.) Presenter:山下雄介; 橋本佳男; Myo Than Htay
CuInO2 薄膜作製の試み 2008(Nov.) Presenter:谷優治; 橋本佳男; Myo Than Htay
超音波噴霧熱分解法により作製したZnO ナノワイヤーの電界電子放出特性 2008(Sep.) Presenter:田中孝典; Myo Than Htay; 但馬義典; 橋本佳男; 伊東謙太郎
基板のアルカリ成分によるZnO ナノワイヤーの成長密度の制御 2008(Sep.) Presenter:Myo Than Htay; 橋本佳男; 伊東謙太郎
超音波噴霧熱分解法によるZnO ナノワイヤーの選択的成長 2008(Mar.) Presenter:Myo Than Htay; 橋本佳男; 百瀬成空; 熊木大輝; 伊東謙太郎
超音波噴霧熱分解法を用いて作製したZnO ナノワイヤーの透過電子顕微鏡による評価 2007(Nov.) Presenter:Myo Than Htay; 橋本佳男; 伊東謙太郎
Synthesis of optical quality ZnO nanowires utilizing ultrasonic spray pyrolysis 2007(Jul.) Presenter:Myo Than Htay; Yuji Tani; Yoshio Hashimoto; Kentaro Ito
Photoluminescence Properties and Morphologies of Submicron-Sized ZnO Crystals Prepared by Ultrasonic Spray Pyrolysis 2007(Jun.) Presenter:Myo Than Htay; Yuji Tani; Yoshio Hashimoto; Kentaro Ito
超音波噴霧熱分解法によるZnO 微結晶の生成 2006(Mar.) Presenter:Myo Than Htay; 橋本佳男; 伊東謙太郎
超音波CVD 法を用いた窒素ドープZnO の作製 2005(Feb.) Presenter:Myo Than Htay; 橋本佳男; 伊東謙太郎
飽和蒸気圧硫化法により作製したCu2ZnSnS4 膜の異相除去 令和4年度 応用物理学会 北陸・信越支部 学術講演会 Presenter:小坂一友、百瀬成空、Myo Than Htay、橋本佳男
研究者総覧
