scholarly journals Photon-mediated entanglement scheme between a ZnO semiconductor defect and a trapped Yb ion

2020 ◽  
Vol 117 (15) ◽  
pp. 154002
Author(s):  
Jennifer F. Lilieholm ◽  
Vasileios Niaouris ◽  
Alexander Kato ◽  
Kai-Mei C. Fu ◽  
Boris B. Blinov
Keyword(s):  
Zno Semiconductor

Electrical Conductivity Measurements of Al-Doped ZnO Semiconductor in High Temperature

2018 ◽  
Vol 772 ◽  
pp. 105-109
Author(s):  
Syamsul Hadi ◽  
Husein Jaya Andika ◽  
Agus Kurniawan ◽  
Suyitno
Keyword(s):  
Electrical Conductivity ◽  
Temperature Effects ◽  
Sintering Temperature ◽  
High Porosity ◽  
Conductivity Measurements ◽  
Grain Sizes ◽  
Lower Porosity ◽  
Doped Zno ◽  
Zno Semiconductor ◽  
Zno Doping

Electrical conductivity plays an important role in the performance of thermoelectric semiconductor material. This study discusses the electrical conductivity measurements of Zinc Oxide (ZnO) doping Aluminium (Al) pellet as a material of thermoelectric using four-point probe method at high temperatures. Al-doped ZnO (2 wt%) pellet was sintered at the temperature of 1100°C, 1200°C, 1300°C, 1400°C, and 1500°C with the heating rate of 8°C/minute. SEM and XRD tests show that the higher sintering temperature effects to larger grain sizes, better crystallinity, and lower porosity. There is no electrical conductivity in the sintering sample at 1100°C due to the small grain sizes and high porosity. In the sintering sample at 1500°C, the phase of ZnAl2O4erupted. The highest electrical conductivity of 5923.48S/m of Al-doped ZnO pellet was obtained at the sintering temperature of 1400°C with measurement temperature of 500°C.

Experimental and ab initio study of Ta-doped ZnO semiconductor

2010 ◽  
pp. 181-186
Author(s):  
E. L. Muñoz ◽  
D. Richard ◽  
P. D. Eversheim ◽  
M. Rentería
Keyword(s):  
Ab Initio ◽  
Ab Initio Study ◽  
Doped Zno ◽  
Zno Semiconductor

scholarly journals Spin-Glass Transitions in Zn1-xFexO Nanoparticles

Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 869 ◽  
Author(s):  
Lilian Felipe S. Tupan ◽  
Marlon I. Valerio-Cuadros ◽  
Aline Alves Oliveira ◽  
Reginaldo Barco ◽  
Flávio Francisco Ivashita ◽  
...  
Keyword(s):  
Spin Glass ◽  
Morphological Changes ◽  
Magnetic Interactions ◽  
Antiferromagnetic Coupling ◽  
Iron Doping ◽  
Drying Process ◽  
Spin Glass Transition ◽  
Spin Polarized ◽  
Doped Zno ◽  
Zno Semiconductor

Monophasic Zn1-xFexO nanoparticles with wurtzite structure were synthesized in the 0 ≤ x ≤ 0.05 concentration range using a freeze-drying process followed by heat treatment. The samples were characterized regarding their optical, structural, and magnetic properties. The analyses revealed that iron doping of the ZnO matrix induces morphological changes in the crystallites. Iron is substitutional for zinc, trivalent and distributed in the wurtzite lattice in two groups: isolated iron atoms and iron atoms with one or more neighboring iron atoms. It was also shown that the energy band gap decreases with a higher doping level. The samples are paramagnetic at room temperature, but they undergo a spin-glass transition when the temperature drops below 75 K. The magnetic frustration is attributed to the competition of magnetic interactions among the iron moments. There are a superexchange interaction and an indirect exchange interaction that is provided by the spin (and charge) itinerant carriers in a spin-polarized band situated in the vicinity of the Fermi level of the Fe-doped ZnO semiconductor. The former interaction actuates for an antiferromagnetic coupling among iron ions, whereas the latter constitutes a driving force for a ferromagnetic coupling that weakens, decreasing the temperature. Our results strongly contribute to the literature because they elucidate the controversies reported in the literature for the magnetic state of the Fe-doped ZnO system.

scholarly journals STUDY ON PERFORMANCE OF HYBRID CELL OF DSSC AND PIEZOELECTRIC IN ONE ACTIVE AREA of AZO NANOFIBER SEMICONDUCTOR

2018 ◽  
Vol 80 (3) ◽  
Author(s):  
Syamsul Hadi ◽  
Mirza Yusuf ◽  
Budi Kristiawan ◽  
Atmanto Heru Wibowo ◽  
Suyitno Suyitno
Keyword(s):  
Solar Cells ◽  
Flow Rate ◽  
Open Circuit Voltage ◽  
Hybrid Cell ◽  
Open Circuit ◽  
Hybrid Cells ◽  
As Doping ◽  
Electrospinning Method ◽  
Doped Zno ◽  
Zno Semiconductor

This study aims to explore the possibilities of hybrid cells to convert photon and mechanical energies in a semiconductor area. A device with a hybrid ability was successfully fabricated from AZO (Al doped ZnO) semiconductor nanofibre-based materials by an electrospinning method. The N-719 dye was used to synthesize the semiconductors. The hybrid cell of DSSC and piezoelectric use flowrates of precursor as a measurement parameter on the electrospinning machine which differences of nanofiber diameters were formed on the collector. Furthermore, aluminum as doping material was also applied to ZnO in order to reduce the size of the fibers. When the hybrid cell worked as solar cells based on AZO, an open circuit voltage was produced in the range of 0.421 to 0.507 V. In greater flow of precursors condition, Voc of DSSC will be slightly decreased. On the AZO-based DSSC, the highest Jsc was 1,147 mA/cm2. When the cell worked as a power nano generator, Voc and highest output power of AZO-based cells were 119 mV and 24,8 nW repectively on the flow rate of 2 mL/min.  

Trivalent dopants on ZnO semiconductor obtained by mechanical milling

2009 ◽  
Vol 483 (1-2) ◽  
pp. 442-444 ◽  
Author(s):  
L.C. Damonte ◽  
V. Donderis ◽  
M.A. Hernández-Fenollosa
Keyword(s):  
Mechanical Milling ◽  
Zno Semiconductor

Competitive Growth of ZnO and ZnS Micro-Nano Structures

2012 ◽  
Vol 512-515 ◽  
pp. 1574-1578
Author(s):  
Wei Wei He ◽  
Jun Sang ◽  
Yang Li ◽  
Hong Xiao Zhao ◽  
Hui Min Jia
Keyword(s):  
Semiconductor Nanostructures ◽  
Diffraction Spectrum ◽  
Competitive Growth ◽  
X Ray Diffraction ◽  
Facile Hydrothermal Method ◽  
Photo Degradation ◽  
X Ray ◽  
Nano Structures ◽  
Higher Temperature ◽  
Zno Semiconductor

In this paper, a facile hydrothermal method has been developed for preparation of micro/nano structures of ZnS microspheres and ZnO microrods. The morphologies and crystalline structures were confirmed by scanning electron microscopy (SEM) and X-ray diffraction spectrum (XRD). In the co-existence of cysteine and hexamethylenetetramine (HMTA), we observed the competitive growth of ZnS and ZnO microstructures, and found that higher temperature was benefited for the formation of ZnS structures. This method may be applied for synthesis of other metal compound micro-nano structures with other metal ions. ZnS and ZnO semiconductor nanostructures as often-used photo-catalyst, we also compared their catalytical activity toward to the photo-degradation of methylene blue.

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