{"title":"Preface for the Special Issue of ALC’22","authors":"H. Shigekawa, Hiroshi Daimon, Hiroki Hibino","doi":"10.1380/ejssnt.2023-069","DOIUrl":"https://doi.org/10.1380/ejssnt.2023-069","url":null,"abstract":"","PeriodicalId":11626,"journal":{"name":"E-journal of Surface Science and Nanotechnology","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2023-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138594308","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
U. Awan, R. Saeed, Hammad Ismail, Sheikh Zain Ul Abidin, Joham Sarfraz Ali, Muhammad Zeeshan Bhatti
{"title":"Emerging Trends of Nanotechnology-Based Advanced Cosmeceuticals","authors":"U. Awan, R. Saeed, Hammad Ismail, Sheikh Zain Ul Abidin, Joham Sarfraz Ali, Muhammad Zeeshan Bhatti","doi":"10.1380/ejssnt.2023-068","DOIUrl":"https://doi.org/10.1380/ejssnt.2023-068","url":null,"abstract":"","PeriodicalId":11626,"journal":{"name":"E-journal of Surface Science and Nanotechnology","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2023-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138606925","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Jeffrey Tanudji, Susan M. Aspera, Hideaki Kasai, Michio Okada, Tetsuo Ogawa, Hiroshi Nakanishi
We have performed first principles calculation study based on density functional theory on the adsorption of iodine and astatine on Au(111) and Au(211), including spin-orbit coupling (SOC) effects in some calculations. These surfaces are the dominant surface termination to represent a face-centered cubic nanoparticle. We found that both iodine and astatine adsorb stronger on the edge-bridge site of the Au(211) surface than on the flat Au(111) surface by about 0.2 eV. This result also makes the adsorbate less likely to diffuse after adsorption on the (211) surface as compared to the (111) surface. Additionally, we found that SOC effects, usually a necessity when considering heavy elements, are not significant in these cases, as can be seen by the energy and geometric data. Finally, we found the difference in adsorption energy between iodine and astatine on gold surface can be expected due to the presence of 4f electrons in astatine, which is not present in iodine. The 4f electrons offer less shielding of the nucleus, making the valence electrons of astatine closer to the nucleus, and therefore a smaller atomic radius. This information is useful both for experimental verification and future developments of gold nanoparticles for radiotherapy.
{"title":"Surface Facet Effect on the Adsorption of Iodine and Astatine on Gold Surface","authors":"Jeffrey Tanudji, Susan M. Aspera, Hideaki Kasai, Michio Okada, Tetsuo Ogawa, Hiroshi Nakanishi","doi":"10.1380/ejssnt.2023-067","DOIUrl":"https://doi.org/10.1380/ejssnt.2023-067","url":null,"abstract":"We have performed first principles calculation study based on density functional theory on the adsorption of iodine and astatine on Au(111) and Au(211), including spin-orbit coupling (SOC) effects in some calculations. These surfaces are the dominant surface termination to represent a face-centered cubic nanoparticle. We found that both iodine and astatine adsorb stronger on the edge-bridge site of the Au(211) surface than on the flat Au(111) surface by about 0.2 eV. This result also makes the adsorbate less likely to diffuse after adsorption on the (211) surface as compared to the (111) surface. Additionally, we found that SOC effects, usually a necessity when considering heavy elements, are not significant in these cases, as can be seen by the energy and geometric data. Finally, we found the difference in adsorption energy between iodine and astatine on gold surface can be expected due to the presence of 4f electrons in astatine, which is not present in iodine. The 4f electrons offer less shielding of the nucleus, making the valence electrons of astatine closer to the nucleus, and therefore a smaller atomic radius. This information is useful both for experimental verification and future developments of gold nanoparticles for radiotherapy.","PeriodicalId":11626,"journal":{"name":"E-journal of Surface Science and Nanotechnology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135666863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We report on a photoemission microscopy apparatus using a 10.9-eV laser developed at the National Institute for Materials Science (NIMS). Our spectrometer realizes photoemission spectroscopy with a high spatial resolution by combining an imaging double energy analyzer with the electronic lens system of photoelectron emission microscopy. Energy-filtered photoelectron imaging is available in both real and momentum spaces. The spatial resolution in the real space mode is ∼30 nm. We show energy-filtered photoelectron images of a silver grid-patterned sample in real space and the band mapping of Au(111) in momentum space to demonstrate the performance of our spectrometer.
{"title":"Development of a Photoemission Microscopy Apparatus Using a Vacuum Ultraviolet Laser","authors":"Koichiro Yaji, Shunsuke Tsuda","doi":"10.1380/ejssnt.2023-066","DOIUrl":"https://doi.org/10.1380/ejssnt.2023-066","url":null,"abstract":"We report on a photoemission microscopy apparatus using a 10.9-eV laser developed at the National Institute for Materials Science (NIMS). Our spectrometer realizes photoemission spectroscopy with a high spatial resolution by combining an imaging double energy analyzer with the electronic lens system of photoelectron emission microscopy. Energy-filtered photoelectron imaging is available in both real and momentum spaces. The spatial resolution in the real space mode is ∼30 nm. We show energy-filtered photoelectron images of a silver grid-patterned sample in real space and the band mapping of Au(111) in momentum space to demonstrate the performance of our spectrometer.","PeriodicalId":11626,"journal":{"name":"E-journal of Surface Science and Nanotechnology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135924677","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Trinh Thi Nguyen, Wentao Du, Hien Thi Thu Khuat, Goro Mizutani
The modification of a polyimide surface containing a 30% fraction of steroidal structure was studied as a function of storage time by vibrational sum frequency generation (SFG) spectroscopy and optical second-harmonic generation (SHG). The variation of the symmetric and anti-symmetric stretching modes of the CH3 isopropyl group at the end of the side chain of the rubbed polyimide was detected in the SFG spectra after a 3-month storage time in a practical environment. It suggests that the isopropyl group might be reoriented. On the other hand, the SHG response of the same sample showed an insignificant storage-time dependence. As a result, the phenyl rings of the polyimide are judged to be unmodified after long-term storage time. The change is suggested to occur for two main reasons. One is the interaction between the polyimide polymers and the ambient water molecules. The other is the adsorption of unknown organic molecules on the polyimide surface.
{"title":"Detection of Surface Modification of Polyimide Containing Steroidal Structure as a Function of Storage Time Using Second-Order Nonlinear Optical Spectroscopy","authors":"Trinh Thi Nguyen, Wentao Du, Hien Thi Thu Khuat, Goro Mizutani","doi":"10.1380/ejssnt.2023-065","DOIUrl":"https://doi.org/10.1380/ejssnt.2023-065","url":null,"abstract":"The modification of a polyimide surface containing a 30% fraction of steroidal structure was studied as a function of storage time by vibrational sum frequency generation (SFG) spectroscopy and optical second-harmonic generation (SHG). The variation of the symmetric and anti-symmetric stretching modes of the CH3 isopropyl group at the end of the side chain of the rubbed polyimide was detected in the SFG spectra after a 3-month storage time in a practical environment. It suggests that the isopropyl group might be reoriented. On the other hand, the SHG response of the same sample showed an insignificant storage-time dependence. As a result, the phenyl rings of the polyimide are judged to be unmodified after long-term storage time. The change is suggested to occur for two main reasons. One is the interaction between the polyimide polymers and the ambient water molecules. The other is the adsorption of unknown organic molecules on the polyimide surface.","PeriodicalId":11626,"journal":{"name":"E-journal of Surface Science and Nanotechnology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134946927","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
We have developed the beam windows for the COherent Muon to Electron Transition (COMET) project. The COMET project is under construction at the proton beam accelerator facility J-PARC in Japan. Windows are one of key components on the beam line. The beam window should pass the beam of proton or other particles effectively, with robustly separating sections of the beam line. After research and developments for the beam windows especially focused on the shape and structure, we employed a dome shape which has radius curvature(s) on to the beam passing area, instead of a conventional thin and flat shape. Additionally, we employed a thicker structure on the circumference part to give higher mechanical strength. To manufacture cost consciously, the beam windows are fabricated by a three-dimensional printer, additive manufacturing (AM) to realize a hard to cut and machine shape. The detailed dimensions were designed through numerical analysis. There are requirements of high transmission efficiency of the beam, such as the material density must be low, and the thickness must be as thin as possible, while minimizing the nuclear heat generation by beam energy loss. Thus, the material was chosen as titanium alloy, Ti-6Al-4V. After the window shape was formed by AM, the voids inside the window were killed by hot isostatic pressing. Finally the window was polished to be smoothen the surface and tailored its thickness. As the first step to be used for the COMET project, for Phase-α we fabricated domes of 270 and 220 mm to mate with the rotatable flanges. The target values of the dome were the thickness tailored below 0.5 mm, and the pressure withstanding performance over 0.8 MPa for each diameter model. Throughout the tests we confirmed that the windows satisfied the target values, and the windows could withstand 0.9 MPa when pressurized from concave side of the dome.
{"title":"3D-Printed Beam Window for J-PARC COMET Project","authors":"Hiroyuki Shidara, Shunsuke Makimura, Yoshinori Fukao, Yutaka Nagasawa, Masahiro Onoi, Hiroaki Kurishita, Naoya Kamei","doi":"10.1380/ejssnt.2023-064","DOIUrl":"https://doi.org/10.1380/ejssnt.2023-064","url":null,"abstract":"We have developed the beam windows for the COherent Muon to Electron Transition (COMET) project. The COMET project is under construction at the proton beam accelerator facility J-PARC in Japan. Windows are one of key components on the beam line. The beam window should pass the beam of proton or other particles effectively, with robustly separating sections of the beam line. After research and developments for the beam windows especially focused on the shape and structure, we employed a dome shape which has radius curvature(s) on to the beam passing area, instead of a conventional thin and flat shape. Additionally, we employed a thicker structure on the circumference part to give higher mechanical strength. To manufacture cost consciously, the beam windows are fabricated by a three-dimensional printer, additive manufacturing (AM) to realize a hard to cut and machine shape. The detailed dimensions were designed through numerical analysis. There are requirements of high transmission efficiency of the beam, such as the material density must be low, and the thickness must be as thin as possible, while minimizing the nuclear heat generation by beam energy loss. Thus, the material was chosen as titanium alloy, Ti-6Al-4V. After the window shape was formed by AM, the voids inside the window were killed by hot isostatic pressing. Finally the window was polished to be smoothen the surface and tailored its thickness. As the first step to be used for the COMET project, for Phase-α we fabricated domes of 270 and 220 mm to mate with the rotatable flanges. The target values of the dome were the thickness tailored below 0.5 mm, and the pressure withstanding performance over 0.8 MPa for each diameter model. Throughout the tests we confirmed that the windows satisfied the target values, and the windows could withstand 0.9 MPa when pressurized from concave side of the dome.","PeriodicalId":11626,"journal":{"name":"E-journal of Surface Science and Nanotechnology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136129648","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Atomic structures of an insulating and hydrophobic zeolite sample of mordenite were measured by high-energy X-ray diffraction, and a pair distribution function analysis was carried out. Valence- and conduction-band O 2p partial densities of states (DOSs) in a mordenite were measured by soft X-ray emission and absorption spectroscopies (SXES and SXAS), respectively. The SXAS spectrum for the conduction band O 2p orbital has characteristic structures like that of crystalline SiO2, while pre-shoulders are observed in mordenite. By choosing characteristic energies in the SXAS spectrum for the incident photon energies, SXES spectra were obtained, in which a large peak and three small peaks or shoulders can be assigned by a lone pair orbital and bonding (σ) ones, respectively. A density functional theory was applied to determine the exact atomic structures and electronic states, and they are in good agreement with the corresponding experiments. It is concluded that the O 2p partial DOS is mainly O-Si covalent bonds, and the Al and Na atoms have minor contributions for them. From this study, it was found that the fundamental properties of complex zeolites can only be obtained in combination of experimental and theoretical investigations as mentioned above, which can open feasibilities to uncover the origin of active sites in functional zeolites.
{"title":"Atomic and Electronic Structures on a Mordenite Zeolite","authors":"Shinya Hosokawa, Hitoshi Sato, Yasuhisa Tezuka, Jun-ichi Adachi, Koji Kimura, Koichi Hayashi, Shinji Kohara, Hiroo Tajiri, Kentaro Kobayashi, Akihide Koura, Fuyuki Shimojo","doi":"10.1380/ejssnt.2023-063","DOIUrl":"https://doi.org/10.1380/ejssnt.2023-063","url":null,"abstract":"Atomic structures of an insulating and hydrophobic zeolite sample of mordenite were measured by high-energy X-ray diffraction, and a pair distribution function analysis was carried out. Valence- and conduction-band O 2p partial densities of states (DOSs) in a mordenite were measured by soft X-ray emission and absorption spectroscopies (SXES and SXAS), respectively. The SXAS spectrum for the conduction band O 2p orbital has characteristic structures like that of crystalline SiO2, while pre-shoulders are observed in mordenite. By choosing characteristic energies in the SXAS spectrum for the incident photon energies, SXES spectra were obtained, in which a large peak and three small peaks or shoulders can be assigned by a lone pair orbital and bonding (σ) ones, respectively. A density functional theory was applied to determine the exact atomic structures and electronic states, and they are in good agreement with the corresponding experiments. It is concluded that the O 2p partial DOS is mainly O-Si covalent bonds, and the Al and Na atoms have minor contributions for them. From this study, it was found that the fundamental properties of complex zeolites can only be obtained in combination of experimental and theoretical investigations as mentioned above, which can open feasibilities to uncover the origin of active sites in functional zeolites.","PeriodicalId":11626,"journal":{"name":"E-journal of Surface Science and Nanotechnology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136129647","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The density functional theory (DFT) is used to analyze the fundamental electronic properties, electronic states of bowtie shaped nanographene (C38H18 Clar's Goblet, CG), which is expected to be applied to such as spintronic devices. We also analyze triangulene, which is similar to CG and easier to make larger structures by increasing connections than CG. We investigate up to the trimer for CG and up to the tetramer for triangulene. In addition, we calculate the electronic structure of nanographene doped with boron and nitrogen. CG and triangulene have smaller bandgaps with BN dopants at the ferromagnetic state. We find that in ferromagnetic states, nitrogen and boron doping brings the up-spin and down-spin levels closer to the Fermi level, especially in triangulene, both levels are almost equal to the Fermi level, and the wavefunctions are localized at both ends of the triangulene.
{"title":"DFT Study of Bowtie Shaped Nanographene","authors":"Reo Iida, Shoichi Sakamoto, Mitsuyoshi Tomiya","doi":"10.1380/ejssnt.2023-060","DOIUrl":"https://doi.org/10.1380/ejssnt.2023-060","url":null,"abstract":"The density functional theory (DFT) is used to analyze the fundamental electronic properties, electronic states of bowtie shaped nanographene (C38H18 Clar's Goblet, CG), which is expected to be applied to such as spintronic devices. We also analyze triangulene, which is similar to CG and easier to make larger structures by increasing connections than CG. We investigate up to the trimer for CG and up to the tetramer for triangulene. In addition, we calculate the electronic structure of nanographene doped with boron and nitrogen. CG and triangulene have smaller bandgaps with BN dopants at the ferromagnetic state. We find that in ferromagnetic states, nitrogen and boron doping brings the up-spin and down-spin levels closer to the Fermi level, especially in triangulene, both levels are almost equal to the Fermi level, and the wavefunctions are localized at both ends of the triangulene.","PeriodicalId":11626,"journal":{"name":"E-journal of Surface Science and Nanotechnology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135305551","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A report of nano-scale interaction of chloromethane (methyl chloride) (CH3Cl) with the Fe(110) surface; van der Waals density functional theory (DFT) study. Physisorption of a CH3Cl molecule via changing the site and orientation of the molecule was studied on the Fe(100) surface using DFT. All reasonable molecular and dissociative adsorption routes of the CH3Cl molecule on the Fe(100) surface have been systematically investigated. Molecular adsorption was considered on four different surface sites with different orientations with Cl, C, and H atoms toward and away from the surface. Chemisorption was considered by decomposition of CH3Cl into a methyl (CH3) group and a Cl atom via a cleavage of the C–Cl bond and by decomposition into a CH2Cl group and a H atom via a cleavage one of the C–H bonds. Chemisorption produces a greater degree of bonding than physisorption.
{"title":"Nano-scale Interaction of Chloromethane (CH<sub>3</sub>Cl) with the Fe(110) Surface; A van der Waals Calculation","authors":"Sherin A. Saraireh","doi":"10.1380/ejssnt.2023-062","DOIUrl":"https://doi.org/10.1380/ejssnt.2023-062","url":null,"abstract":"A report of nano-scale interaction of chloromethane (methyl chloride) (CH3Cl) with the Fe(110) surface; van der Waals density functional theory (DFT) study. Physisorption of a CH3Cl molecule via changing the site and orientation of the molecule was studied on the Fe(100) surface using DFT. All reasonable molecular and dissociative adsorption routes of the CH3Cl molecule on the Fe(100) surface have been systematically investigated. Molecular adsorption was considered on four different surface sites with different orientations with Cl, C, and H atoms toward and away from the surface. Chemisorption was considered by decomposition of CH3Cl into a methyl (CH3) group and a Cl atom via a cleavage of the C–Cl bond and by decomposition into a CH2Cl group and a H atom via a cleavage one of the C–H bonds. Chemisorption produces a greater degree of bonding than physisorption.","PeriodicalId":11626,"journal":{"name":"E-journal of Surface Science and Nanotechnology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135305552","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
AlGaN/GaN high electron mobility transistors (HEMTs) possess favorable material properties and are compatible with large-scale manufacturing, making them promising as a next-generation power device. However, there is a lack of information available on the effect of an insulator dielectric passivation layer on the breakdown voltage (Vbr) of AlGaN/GaN HEMTs. This study utilizes technology computer aided design to investigate the impact of different insulator dielectric passivation layers, such as SiO2, SiN, Al2O3, and HfO2, on Vbr of AlGaN/GaN HEMTs. Furthermore, the study optimizes the parameters of the field plate length (LFP) and insulator thickness to maximize Vbr of AlGaN/GaN HEMTs. Results indicate that HEMTs with a field plate (FP-HEMTs) have greater Vbr than HEMTs without a field plate (N-HEMTs). With the optimized conditions of a 1.8 µm LFP and a 0.95 µm insulator thickness with HfO2 passivation, Vbr of 1120 V is achieved. The findings suggest that the field plate (FP) and passivation layer can significantly improve the efficiency and reliability of AlGaN/GaN HEMTs while the impact of AlGaN/GaN heterostructure parameters on Vbr is minimal.
{"title":"Design Optimization of High Breakdown Voltage AlGaN/GaN High Electron Mobility Transistor with Insulator Dielectric Passivation Layer","authors":"Phuc Hong Than, Tho Quang Than","doi":"10.1380/ejssnt.2023-061","DOIUrl":"https://doi.org/10.1380/ejssnt.2023-061","url":null,"abstract":"AlGaN/GaN high electron mobility transistors (HEMTs) possess favorable material properties and are compatible with large-scale manufacturing, making them promising as a next-generation power device. However, there is a lack of information available on the effect of an insulator dielectric passivation layer on the breakdown voltage (Vbr) of AlGaN/GaN HEMTs. This study utilizes technology computer aided design to investigate the impact of different insulator dielectric passivation layers, such as SiO2, SiN, Al2O3, and HfO2, on Vbr of AlGaN/GaN HEMTs. Furthermore, the study optimizes the parameters of the field plate length (LFP) and insulator thickness to maximize Vbr of AlGaN/GaN HEMTs. Results indicate that HEMTs with a field plate (FP-HEMTs) have greater Vbr than HEMTs without a field plate (N-HEMTs). With the optimized conditions of a 1.8 µm LFP and a 0.95 µm insulator thickness with HfO2 passivation, Vbr of 1120 V is achieved. The findings suggest that the field plate (FP) and passivation layer can significantly improve the efficiency and reliability of AlGaN/GaN HEMTs while the impact of AlGaN/GaN heterostructure parameters on Vbr is minimal.","PeriodicalId":11626,"journal":{"name":"E-journal of Surface Science and Nanotechnology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135305556","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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