Article
Materials Science, Ceramics
Wiem Bouslama, Monaam Ben Ali, Nasr Sdiri, Habib Elhouichet
Summary: Fe doped ZnO nanocrystals synthesized from sol-gel method exhibit good crystalline quality and electrical properties, showing potential for energy storage applications.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Inorganic & Nuclear
Ramachandrapanicker Devi Chandra, Lalan Veena, Kunnel Gopalan Gopchandran
Summary: Cobalt (Co)-doped ZnO nanoparticles were synthesized at 100°C using a simple chemical technique, resulting in nanoparticles with high crystallinity and reduced defect density. Co-doping suppressed oxygen-vacancy-related defects at lower doping densities, but increased defect density at higher doping densities. Co-doping was found to significantly suppress defects in ZnO for electronic and optoelectronic applications, as demonstrated by XPS, PL, electrical conductivity, and Mott-Schottky analysis. Photodetectors fabricated with Co-doped ZnO nanoparticles showed faster response time due to the reduced defect density.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Li-Na Wu, Gao-Jun Zhang, Si-Tong Yang, Jia-Xing Guo, Shao-Yi Wu
Summary: This study investigates the defect structures of Mn2+ and Co2+ in ZnO nanowires and considers their contributions to the spin Hamiltonian parameters. The study also discusses the effect of different crystalline morphologies on the defect structures and spectral properties.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2022)
Article
Materials Science, Multidisciplinary
Betul Akkopru-Akgun, Thorsten J. M. Bayer, Kosuke Tsuji, Clive A. Randall, Michael T. Lanagan, Susan Trolier-McKinstry
Summary: The electrical reliability of lead zirconate titanate (PZT) films was improved by incorporating Mn, resulting in increased dielectric breakdown lifetimes and activation energy. The study focused on the correlation between defect chemistry and resistance degradation to understand the mechanisms behind enhanced electrical reliability. Both Poole-Frenkel emission and Schottky emission were identified as controlling factors for leakage current at different electric field strengths.
Article
Materials Science, Multidisciplinary
Indrajit V. Bagal, Pratik Mane, Maheshwari Arunachalam, Hyojung Bae, Mandar A. Kulkarni, Fawad Tariq, Soon Hyung Kang, Jun-Seok Ha, Sang-Wan Ryu
Summary: By constructing a type-II heterostructure of N-doped ZnO nanowires with an ultra-thin ZnS layer, a core-shell structure is formed which can accelerate the charge transfer process and significantly enhance the resistance to photo-corrosion of N-doped ZnO NWs. The optimal ZnS/N:ZnO core-shell nanowires exhibited a photocurrent density of 0.85 mA cm(-2) at 1.23 Vs RHE, which was 3-fold higher than ZnO nanowires. The reported approach provides possibilities for the construction of efficient and highly stable PEC water-splitting devices.
MATERIALS TODAY PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
H. Akther, M. Mahbubur Rahman, A. H. Bhuiyan, Humayun Kabir, Sm Amir-Al Zumahi, J. A. Syed, Rahima Nasrin
Summary: In this study, PPTMA thin films were produced through plasma polymerisation process and evaluated using various characterisation techniques. The results showed that iodine-doped PPTMA films exhibited higher conductivity compared to the as-deposited ones.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Jun Tatebayashi, Kazuto Nishimura, Shuhei Ichikawa, Shinya Yamada, Yoshikata Nakajima, Kazuhisa Sato, Kohei Hamaya, Yasufumi Fujiwara
Summary: This study demonstrates a heterojunction p-GaN/n-ZnO LED structure using Eu-doped ZnO as an active component, aiming to realize low-cost and environmentally-friendly red LEDs with sharp linewidth and temperature stability. An Al2O3 electron blocking layer is inserted between p-GaN and ZnO:Eu/n-ZnO to facilitate carrier injection into the ZnO:Eu active layer. The device characteristics of the LED structures show red luminescence under current injection with reversed bias voltage, originating from Eu3+ ions in the ZnO host. Detailed optical characteristics of the ZnO:Eu layer enable the identification of luminescence centers contributing to Eu luminescence under indirect excitation and collisional excitation, paving the way for understanding the Eu luminescence mechanism in ZnO:Eu and realizing high-brightness LED structures based on rare-Earth doped ZnO.
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(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
Nanoscience & Nanotechnology
Xoan Xose Fernandez Sanchez-Romate, Antonio del Bosque Garcia, Maria Sanchez, Alejandro Urena
Summary: The temperature effect on electronic transport mechanisms in graphene nanoplatelet (GNP) doped polydimethylsiloxane (PDMS) for temperature sensing applications has been investigated. The AC measurements showed frequency-dependent behavior in low filled nanocomposites due to lower charge density. The temperature promotes a prevalence of scattering effects, resulting in an increase of resistance and inductance, a decrease of capacitance values, and a change from ideal to nonideal capacitive behavior.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
G. Milano, L. D'Ortenzi, K. Bejtka, B. Ciubini, S. Porro, L. Boarino, C. Ricciardi
Summary: This work investigates the metal-insulator transition and electronic transport properties of ZnO nanowires synthesized by Chemical Vapor Deposition. It reveals a thermally activated conduction mechanism with two channels and the tunability of the electrical properties from semiconductor to metallic-like behavior with temperature. The unique electronic transport properties are influenced by native defects, Coulomb interactions, and surface states affected by adsorbed species.
Article
Nanoscience & Nanotechnology
Aristide Djoulde, Mengfan He, Xinyue Liu, Lingdi Kong, Pengfei Zhao, Jinjun Rao, Jinbo Chen, Lingjun Meng, Zhiming Wang, Mei Liu
Summary: We explored the electrical activity and extremes inside individual suspended ZnO nanowires and observed high electrical resistivity and electron density. We also discovered thermal breakdown due to Joule heating and investigated the temperature distribution and thermal conductance. This work provides valuable insights into the potential and limitations of suspended NWs in high-performance nanodevices.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Electrical & Electronic
Ahmed A. Aboud, Ayan Mukherjee, M. Al-Dossari, N. S. Abd EL-Gawaad, Ahmed M. Saad
Summary: We report the formation of hexagonal nano-sheets of pure and Co-doped ZnO thin films using aerosol-assisted chemical vapor deposition technique. Two phases of ZnO, Wurtzite and Zinc blende, were observed in the films by X-Ray diffraction. Scanning electron microscope images show the formation of hexagonal nano-sheets on the substrate surface. Beer's law was used to determine the band gap of the films. The performance of both films as UV detectors was investigated, with the response/decay time showing large values. Co-doping decreased the response time while increasing the decay time. The Co-doped ZnO films exhibited a minimum response time of 4s at 5V applied voltage, but had a lower gain value compared to the pure film.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Physical
L. H. Nguyen, N. T. Dang, N. Dang, L. Bau, P. H. Nam, L. T. H. Phong, D. H. Manh, P. T. Phong
Summary: The substitution of Ti at the Mn site in La0.7Ba0.3Mn1-xTixO3 samples has been found to affect the structural, magnetic, and electrical properties, leading to a decrease in Tc and tuning of the electrical transport behavior. Metal-insulator transition is observed in specific samples, while a rapid decrease in T-C is attributed to non-ferromagnetic Ti ions weakening the double-exchange interaction. Various conduction models were used to analyze the electrical resistivity data in metallic and insulating regions of the samples. The study provides insights into the electronic transport nature in La0.7Ba0.3Mn1-xTixO3 materials.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Multidisciplinary Sciences
Morteza Ahmadi, Masoud Abrari, Majid Ghanaatshoar
Summary: The study proposes and fabricates a heterojunction between Al-doped ZnO and (Mg, N)-doped CuCrO2 thin films using sputtering deposition method, achieving an efficient UV photovoltaic photodetector with fast response, high photosensitivity, responsivity, and detectivity compared to traditional photoconductors.
SCIENTIFIC REPORTS
(2021)
Article
Electrochemistry
K. Govatsi, G. Syrrokostas, S. N. Yannopoulos, S. G. Neophytides
Summary: Undoped and aluminum-doped ZnO nanowire arrays were prepared using chemical bath deposition technique, with optimal doping concentration at 0.5 at.%. The photocurrent density was significantly increased, possibly due to the promoting effect of Al ions and photoactivation of more sites.
ELECTROCHIMICA ACTA
(2021)
Article
Multidisciplinary Sciences
Sheng-Shiuan Yeh, Ta-Kang Su, An-Shao Lien, Farzaneh Zamani, Johann Kroha, Chao-Ching Liao, Stefan Kirchner, Juhn-Jong Lin
NATURE COMMUNICATIONS
(2020)
Article
Physics, Applied
Sheng-Shiuan Yeh, Cheng-Ya Yu, Yi-Te Lee, Shao-Pin Chiu, Juhn-Jong Lin
PHYSICAL REVIEW APPLIED
(2020)
Article
Chemistry, Multidisciplinary
Pok Lam Tse, Fugu Tian, Laura Mugica-Sanchez, Oliver Rueger, Andreas Undisz, George Mothrath, Carsten Ronning, Susumu Takahashi, Jia Grace Lu
Article
Physics, Applied
Shao-Pin Chiu, Wen-Long Lai, Juhn-Jong Lin
Summary: The study demonstrates the fabrication process of transparent disilicide superconductor/normal-metal contact junctions and highlights the potential advantages over conventional junctions. It also proposes the use of epitaxial CoSi2/Si heterostructures in superconducting devices and qubits.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2021)
Article
Multidisciplinary Sciences
Shao-Pin Chiu, C. C. Tsuei, Sheng-Shiuan Yeh, Fu-Chun Zhang, Stefan Kirchner, Juhn-Jong Lin
Summary: Triplet pairing has been observed in nonmagnetic CoSi2/TiSi2 heterostructures on silicon, indicating chiral p-wave pairing. This discovery is significant for topological materials and quantum technology research, and suggests potential applications of CoSi2 and TiSi2 in silicon-based integrated-circuit technology.
Article
Multidisciplinary Sciences
Yi Wan, En Li, Zhihao Yu, Jing-Kai Huang, Ming-Yang Li, Ang-Sheng Chou, Yi-Te Lee, Chien-Ju Lee, Hung-Chang Hsu, Qin Zhan, Areej Aljarb, Jui-Han Fu, Shao-Pin Chiu, Xinran Wang, Juhn-Jong Lin, Ya-Ping Chiu, Wen-Hao Chang, Han Wang, Yumeng Shi, Nian Lin, Yingchun Cheng, Vincent Tung, Lain-Jong Li
Summary: Two-dimensional semiconducting monolayers, such as transition metal dichalcogenides (TMDs), have great potential as channel materials in advanced electronics. Innovative growth reactions using hydroxide W species as a metal precursor show significantly lower defect density compared to conventional chemical vapor deposition (CVD) methods. Field-effect transistor (FET) devices based on this growth method exhibit high electron mobility and on-state current, comparable to exfoliated flakes, indicating the industrial potential of 2D materials.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Meng-Kai Lin, Guan-Hao Chen, Ciao-Lin Ho, Wei-Chen Chueh, Joseph Andrew Hlevyack, Chia-Nung Kuo, Tsu-Yi Fu, Juhn-Jong Lin, Chin Shan Lue, Wen-Hao Chang, Noriaki Takagi, Ryuichi Arafune, Tai-Chang Chiang, Chun-Liang Lin
Summary: Monolayer transition metal dichalcogenides show tunability in electronic properties, with bandgap modulation possible through control of tunneling current. Monolayer PtTe2 exhibits a reversible semiconductor-to-metal transition at moderate tunneling current, attributed to its surface electronic structure coupling with the tunneling tip.
Article
Physics, Condensed Matter
Juhn-Jong Lin, Zhi-Qing Li, Chih-Yuan Wu, Sheng-Shiuan Yeh
Summary: This paper reanalyzes the seminal work by Dolan and Osheroff [Phys. Rev. Lett. 43, 721 (1979)] on the anomalous low-temperature conduction of high-resistivity thin-film metal strips. It argues that the observed logarithmic increase of resistance with decreasing temperature in their 3 nm thick Au-Pd strips can be attributed to the granularity effect on electron conduction in discontinuous metal films. This reanalysis is further supported by the measurements on conducting Pb-x(SiO2)(1-x) nanogranular films, where x is the volume fraction of Pb.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2023)
Article
Physics, Applied
Po-Yu Chien, Chih-Yuan Wu, Ruey-Tay Wang, Shao-Pin Chiu, Stefan Kirchner, Sheng-Shiuan Yeh, Juhn-Jong Lin
Summary: We conducted measurements on 1/f noise of IrO2 nanowires from 1.7 to 350 K. The findings indicate an increase in noise magnitude at low temperatures, suggesting the presence of low-frequency resistance noise arising from universal conductance fluctuations. This noise is attributed to oxygen vacancies in the rutile structure of IrO2. Furthermore, the number density of these mobile defects can be determined by calculating the vT resistance rise caused by the two-channel Kondo effect in the Dirac nodal line metal IrO2.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Wan-Hsin Chen, Chin-Hsuan Chen, Guan-Hao Chen, Wei-Chuan Chen, Fu-Xiang Rikudo Chen, Pei-Jung Chen, Chun-Kai Ku, Chang-Tsan Lee, Naoya Kawakami, Jia-Ying Li, Iwao Matsuda, Wen-Hao Chang, Juhn-Jong Lin, Chien-Te Wu, Chung-Yu Mou, Horng-Tay Jeng, Shu-Jung Tang, Chun-Liang Lin
Summary: In this work, a buckled plumbene-Au Kagome superstructure grown by depositing Au on Pb(111) is investigated, which not only has an enhanced superconducting critical temperature (T-c) with respect to that of a monolayer Pb but also possesses a higher value than what owned by a bulk Pb substrate. By combining angle-resolved photoemission spectroscopy with density functional theory, the monolayer Au-intercalated low-buckled plumbene sandwiched between the top Au Kagome layer and the bottom Pb(111) substrate is confirmed and the electron-phonon coupling-enhanced superconductivity is revealed. This work demonstrates that a buckled plumbene-Au Kagome superstructure can enhance superconducting T-c and Rashba effect, effectively triggering the novel properties of a plumbene.
Article
Chemistry, Multidisciplinary
Shao-Pin Chiu, Vivek Mishra, Yu Li, Fu-Chun Zhang, Stefan Kirchner, Juhn-Jong Lin
Summary: We observe enhanced interfacial two-component superconductivity with a dominant triplet component in nonmagnetic CoSi2/TiSi2 superconductor/normal-metal planar heterojunctions. This is achieved by detecting odd-frequency spin-triplet even-parity Cooper pairs in the diffusive normal-metal part of T-shaped proximity junctions. The transition temperature enhancement can be tuned by up to a factor of 2.3 and the upper critical field increases by up to a factor of 20 by modifying the diffusivity of the normal-metal part. The findings are attributed to the C49 phase of TiSi2 stabilized in confined geometries and are supported by a Ginzburg-Landau model and the quasi-classical theory. Our results are also relevant to the enigmatic 3-K phase reported in Sr-2 RuO4.
Article
Materials Science, Multidisciplinary
Jie Pan, Sheng-Shiuan Yeh, Haijing Zhang, David G. Rees, Ting Zhang, Bing Zhang, Juhn-Jong Lin, Ping Sheng
Summary: The study found that antidot graphene near the charge neutrality point exhibits changes in resistance and nonlinear current-voltage behavior, characterized by a hard gap and a parallel tunneling conduction channel. Both channels show unified good agreement with the predictions of a proposed DOS model in terms of temperature and electric field dependencies.
Article
Materials Science, Multidisciplinary
David G. Rees, Sheng-Shiuan Yeh, Ban-Chen Lee, Simon K. Schnyder, Francis I. B. Williams, Juhn-Jong Lin, Kimitoshi Kono