optical properties of low dimensional zno

... thicknesses of 50 nm In Fig 2(c) and (d), FE-SEM images of the submicrorods ZnO is shown The diameters of ZnO rods are about 100 nm and their lenghts are up to ␮m The FE-SEM images of the microrods ZnO ... diameters of about 50 nm and lengths of 300 nm Fig (i–k) exhibits the FESEM images of nanoparticle-decorated ZnO pigment The surface of ZnO pigment was decorated by nanoparticles with diameters 35 of ... spectra of as-synthesized ZnO pigments From Fig 4, it can be observed that the spectral reflectances of nanorod and microrod ZnO pigments are lower than the others Because of the particle sizes of...

Ngày tải lên: 06/05/2014, 13:23

... well-crystallized particles of prepared ZnO Fig 1b shows the UV–visible optical absorption characteristics of the sea urchin-like ZnO Excitonic absorption peak of the ZnO sample is at about 360 ... results of Fig 2d For analyzing the photoelectric properties of the sea urchin-like ZnO nanostructures, simple battery devices were fabricated Fig shows the I–V curve of the sea urchin-like ZnO nanostructures ... UV–visible optical absorption characteristics (b) of the sea urchin-like ZnO nanostructures Fig SEM images (a,b), TEM image (c), HRTEM image (d) and SAED pattern (e) of the sea urchin-like ZnO nanostructures...

Ngày tải lên: 06/05/2014, 13:23

... physical properties of ZnO nanostructures [19] The irradiation changes the amount of defects in ZnO nanorods resulting in changes in the optical properties of ZnO The effect of the ion irradiation of ... minor effect on optical properties of the LED devise after irradiation with moderate fluences Conclusion In summary, the influence of He+ ion irradiation on the optical properties of ZnO nanorods ... irradiation on the optical properties of ZnO nanorod-based LEDs There are only few reports about the effect of high-energy electrons irradiation that has been reported for ZnO [15], GaN [16–17],...

Ngày tải lên: 18/06/2014, 22:20

... physical properties of ZnO nanostructures [19] The irradiation changes the amount of defects in ZnO nanorods resulting in changes in the optical properties of ZnO The effect of the ion irradiation of ... minor effect on optical properties of the LED devise after irradiation with moderate fluences Conclusion In summary, the influence of He+ ion irradiation on the optical properties of ZnO nanorods ... irradiation on the optical properties of ZnO nanorod-based LEDs There are only few reports about the effect of high-energy electrons irradiation that has been reported for ZnO [15], GaN [16–17],...

Ngày tải lên: 20/06/2014, 04:20

... the optical and electrical performances of the materials We focused on the temperature-dependent PL measurements of various silver-doped ZnO (SZO) NWs to reveal the role of Ag acceptor in the optical ... 1SZO NWs easily become Ag-doping in the ZnO- based structure because of both low Ea and optimized quantity of substitution function of Ag+ [19] However, stress of lattices structure on both 3SZO and ... Resistance (M ) Page of Ag concentration (wt %) Figure Physical properties of varios SZO NW (a) Tuned resistances of un-doped, 1SZO, 3SZO, and 5SZO NWs, the resistances of the SZO NW are measured...

Ngày tải lên: 20/06/2014, 22:20

... annealing Page of Conclusion We have studied the effects of a low- temperature AlGaAs capping layer on the optical properties of a GaAs QW, using different capping temperatures of 200, 350, 450, ... previous reports on the properties of GaAs grown at low temperatures Since the first report by Stall et al [22] that the electrical properties of GaAs were degraded when grown below 480°C, many efforts ... electron diffraction (RHEED) The optical properties of the samples were investigated in terms of photoluminescence (PL) PL spectra were taken at K, using the 532-nm line of a frequencydoubled Nd:YAG...

Ngày tải lên: 21/06/2014, 06:20

... reflectance patterns of the ZnO films All ZnO films showed different patterns according to the wavelength of incidence rays The ZnO film with a 0° growth angle has the lowest reflectance of 10.81% at ... angles Film thickness is of the same value (100 nm) Figure 2a-1 shows the crosssection view of the 0° growth-angled columnar ZnO film Columnar ZnO films with angles of 15° and 30° are shown in ... condition on average and low values The transmittance and reflectance are slightly changed by the growth angle of ZnO films Figure shows the reflectance patterns of the ZnO films with different...

Ngày tải lên: 21/06/2014, 17:20

... spectra of C-doped ZnO exhibit characteristic peaks of graphitic material N Tu et al / Journal of Luminescence 174 (2016) 6–10 Fig Photoluminescence spectra of ZnO source material and ZnO: 4%C ... source ZnO The Raman mode at 1594 cm À is a characteristic of graphitic Fig FTIR spectra of ZnO source material and ZnO: C (2, 3, and 4%C) annealed at 800 °C The peak corresponding to ZnO bond ... XRD patterns of ZnO source material and ZnO: 4% C at different annealing temperatures (a), ZnO: C (2, 3, 4%) at the same annealing temperature of 800 °C The inset shows XRD patterns of the three...

Ngày tải lên: 01/09/2017, 12:49

... important transfer of the oscillator strength to the low- energy side Moreover, in the emission spectrum, the rich structure of states characterized, in the low- energy side, by the presence of excitons ... the electronic properties of the Si-nc are influenced by the insertion of more and more impurities We call this insertion of several impurities multidoping Fig shows how the FE of a large Si147H100-nc ... systematic analysis of the effect of the B and P codoping in Si-nw, concentrating not only on the structural properties but also on how doping influences the electronic and optical properties Here,...

Ngày tải lên: 16/03/2014, 15:15

... 1⋅82 Optical properties of nano-silicon 289 clear distinction between hydrogen free and hydrogenated clusters Figure Plots of gap energy as a function of number of Si atoms and effective size of ... Raman spectra of (a) nanocrystalline Si prepared by pulsed plasma processing and (b) porous silicon prepared by anodic etching using 488 nm line of Ar+ laser Optical properties of nano-silicon ... nano-silicon 287 time or with decreasing the thickness of the a-Si : H layer This results in termination of dangling bonds of the surface Si atoms of nanocrystalline silicon Nanocrystalline silicon...

Ngày tải lên: 16/03/2014, 15:31

... simple EMA models Optical properties of SiNWs and GeNWs In Section of the present paper, we aim to point out the importance of the many-body effects on the optical response of some of the studied ... onset of optical absorption is found only in the case of GeNWs and not in the case of SiNWs With the inclusion of the excitonic effects (bottom panels) we see that an important transfer of the ... different geometrical structure of wires grown with different orientation Finally the comparison of the optical spectra of SiNWs and GeNWs with diameters of the order of 0.8 nm, demonstrates that...

Ngày tải lên: 16/03/2014, 15:33

... Magneto -optical properties of magnetic multilayers 2.2.1 Magneto -optical properties of Co/Pd systems 2.2.2 Magneto -optical properties of Co/Pt multilayers 2.2.3 Magneto -optical properties of Co/Cu ... physical properties of layered structures including the MO properties Chapter of the book presents the MO properties of f band ferromagnetic materials Sections 3.1 devoted to the MO properties of 4f ... AND MAGNETO -OPTICAL PROPERTIES OF SOLIDS TLFeBOOK This page intentionally left blank TLFeBOOK Electronic Structure and Magneto -Optical Properties of Solids by Victor Antonov Institute of Metal Physics,...

Ngày tải lên: 17/03/2014, 14:51

... the intensity of this peak increases relative to that of UV emission as the length of nanorods increases A similar PL pattern with two emission maxima, yet at much lower energies of 2.8 and 2.3 ... reaction temperature of 250 °C (Figure 3a).19 Longer nanorods of 130 ( 30 nm in length (aspect ratio ≈ 20) were prepared at 270 °C by using 12 equiv of oleylamine instead of 16 equiv (Figure 3b).19 ... COMMUNICATIONS Comparing the intensities of the (010) and (014) peaks of the sample with those of the bulk W18O49, it was found that the relative intensity of (010) has been dramatically increased...

Ngày tải lên: 20/03/2014, 13:08

Ngày tải lên: 22/03/2014, 11:20

... Electrons in a “flatland” are amazing! A simple low- temperature measurement of the resistance of a two -dimensional electron system (2DES) as a function of perpendicular magnetic field (B) reveals why ... picture of the physics of the 2DES at high M Shayegan: Electrons in a Flatland magnetic fields Among these are the descriptions of the 2DESs at high B in terms of quasi-particles which consist of electrons ... insulating states at low fillings The purpose of these notes is to provide a glimpse of some of the exciting recent experimental results in this field I will focus on the following five areas; I...

Ngày tải lên: 24/04/2014, 17:13

... studies of electronic properties of solids If we think of the optical properties for various classes of materials, it is clear from Fig 3.3 that major differences will be found from one class of materials ... Frequency Thus, at very low frequencies the optical properties of semiconductors exhibit a metal-like behavior, while at very high frequencies their optical properties are like those of insulators A ... Schematic diagram of an allowed interband transition Figure 3.2: Real part of the conductivity for an allowed optical transition We note that σ1 (ω) = (ω/4π)ε2 (ω) 16 Because of the Pauli Exclusion...

Ngày tải lên: 24/04/2014, 17:13

... growth quality of the BFO thin film for further optical measurement and analysis Page of SE measurements were taken to investigate the optical properties of the BFO film Considering the optical investigation ... details Key Laboratory of Micro and Nano Photonic Structures, Ministry of Education, Shanghai Engineering Research Center of Ultra-Precision Optical Manufacturing, Department of Optical Science and ... layer/film structure, we should firstly obtain the optical response of the STO substrate and SRO buffer layer and then research the optical properties of the BFO thin film The ellipsometric spectra...

Ngày tải lên: 06/05/2014, 09:01

Ngày tải lên: 13/05/2014, 09:07

... metal thickness and the study of optical properties of metal coated microspheres), the optical properties of metamaterials made with stacked hole arrays and the guiding of metallic waveguides (and ... the seed and the feed of this thesis It is a long list of collaborators working in the groups of Prof T.W Ebbesen, Prof S.I Bozhevolnyi, Prof D Bäuerle, Prof J.R Kreen, Prof A Dereux and A.V Kats ... their optical response may be different than the optical response of its bulk components In this chapter we investigate the optical response of one of these metamaterials presenting NRI, a two-dimensional...

Ngày tải lên: 29/05/2014, 18:40

... the second batch of samples (prepared with very low concentration of metal ions) even after a couple of months Characterizations Room temperature optical absorption spectra of the colloidal samples ... the reduction potential of Ag (0.8 V) is smaller that the reduction potential of Au (1.5 V), the velocity of reduction of Au ions is faster than the velocity of reduction of Ag ions So, an increasing ... reduction of HAuCl4 does not permit a complete dissolution of silver salts and therefore reduction of Ag+ ions due to spontaneous formation of AgCl(s) Considering the solubility product (Kps) of AgCl(s)...

Ngày tải lên: 04/06/2014, 15:20