Extension of the photoresponse of semiconducting zinc oxide electrodes by 3d-impurities absorbing in the visible region of the solar spectrum

1985 ◽  
Vol 188 (1-2) ◽  
pp. 167-187 ◽  
Author(s):  
Denis Fichou ◽  
Joseph Pouliquen ◽  
Jean Kossanyi ◽  
Mohamed Jakani ◽  
Guy Campet ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Visible Region ◽  
Solar Spectrum ◽  
Oxide Electrodes ◽  
3D Impurities

ChemInform Abstract: EXTENSION OF THE PHOTORESPONSE OF SEMICONDUCTING ZINC OXIDE ELECTRODES BY 3D-IMPURITIES ABSORBING IN THE VISIBLE REGION OF THE SOLAR SPECTRUM

1985 ◽  
Vol 16 (40) ◽  
Author(s):  
D. FICHOU ◽  
J. POULIQUEN ◽  
J. KOSSANYI ◽  
M. JAKANI ◽  
G. CAMPET ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Visible Region ◽  
Solar Spectrum ◽  
Oxide Electrodes ◽  
3D Impurities

scholarly journals Synergistic Effects in a ZnO Powder-Based Coating Sequentially Irradiated with Protons, Electrons, and Solar Spectrum Quanta

Symmetry ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1021
Author(s):  
Mikhail M. Mikhailov ◽  
Semyon A. Yuryev ◽  
Alexey N. Lapin ◽  
Vadim V. Karanskiy
Keyword(s):  
Zinc Oxide ◽  
Absorption Coefficient ◽  
Near Infrared ◽  
Synergistic Effects ◽  
High Vacuum ◽  
Visible Region ◽  
Solar Spectrum ◽  
Complete Recovery ◽  
Solar Irradiation ◽  
Integral Absorption

The authors investigated the changes in diffuse reflectance spectra (ρλ) within 0.32–2.1 μm and integral absorption coefficient (as) of solar irradiation for a zinc oxide powder-based coating. The latter was consequently irradiated with protons (E = 3 keV, F ≤ 1 × 1016 cm−2), solar spectrum quanta (5 eq. of solar irradiation, 1 h), electrons (E = 30 keV, F = 1 × 1016 cm−2), and—repetitively—solar spectrum quanta (5 eq. of solar irradiation, 1 h). Following the irradiation procedure, the decrease in absorption coefficient varied from 0.044 to 0.036 and from 0.062 to 0.04, respectively. Additionally, it was shown that the solar spectrum quanta did not significantly affect the coating pre-irradiated with protons or electrons and did not change the value of induced absorption in the visible region (the latter being caused by the absorption of intrinsic point defects of the zinc oxide crystal lattice). The absorption coefficient degradation decreased under solar spectrum quanta irradiation, which was determined by the decrease in the concentration of free electrons that absorbed in the near-infrared (near-IR) region. ρλ spectra were measured in high vacuum in situ. A post-irradiation transfer of a coating into the atmosphere leads not only to the complete recovery of its reflectance, but also to partial translucence in comparison with the non-irradiated state.

Well-Aligned Graphene Oxide Nanosheets Decorated with Zinc Oxide Nanocrystals for High Performance Photocatalytic Application

2015 ◽  
Vol 14 (03) ◽  
pp. 1550007 ◽  
Author(s):  
K. Kaviyarasu ◽  
C. Maria Magdalane ◽  
E. Manikandan ◽  
M. Jayachandran ◽  
R. Ladchumananandasivam ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Graphene Oxide ◽  
High Performance ◽  
Chemical Reduction ◽  
Visible Region ◽  
Single Layer ◽  
Single Layer Graphene ◽  
Graphene Oxides ◽  
X Ray ◽  
Nanoscale Structures

Graphene oxide (GO) nanosheets modified with zinc oxide nanocrystals were achieved by a green wet-chemical approach. As-obtained products were characterized by XRD, Raman spectra, XPS, HR-TEM, EDS, PL and Photocatalytic studies. XRD studies indicate that the GO nanosheet have the same crystal structure found in hexagonal form of ZnO . The enhanced Raman spectrum of 2D bands confirmed formation of single layer graphene oxides. The gradual photocatalytic reduction of the GO nanosheet in the GO : ZnO suspension of ethanol was studied by using X-ray photoelectron (XPS) spectroscopy. The nanoscale structures were observed and confirmed using high resolution transmission electron microscopy (HR-TEM). The evolution of the elemental composition, especially the various numbers of layers were determined from energy dispersive X-ray spectra (EDS). PL properties of GO : ZnO nanosheet were found to be dependent on the growth condition and the resultant morphology revealed that GO nanosheet were highly transparent in the visible region. The photocatalytic performance of GO : ZnO nanocomposites was performed under UV irradiation. Therefore, the ZnO nanocrystals in the GO : ZnO composite could be applied in gradual chemical reduction and consequently tuning the electrical conductivity of the graphene oxide nanosheet.

scholarly journals Effect of thickness on the optical properties of Gaas thin films

2013 ◽  
Vol 37 (1) ◽  
pp. 83-91 ◽  
Author(s):  
Chitra Das ◽  
Jahanara Begum ◽  
Tahmina Begum ◽  
Shamima Choudhury
Keyword(s):  
Thin Films ◽  
Dielectric Constant ◽  
Refractive Index ◽  
Band Gap ◽  
Optical Band Gap ◽  
Visible Region ◽  
Solar Spectrum ◽  
Band Gap Energy ◽  
Optical Parameters ◽  
Gap Energy

Effect of thickness on the optical and electrical properties of gallium arsenide (GaAs) thin films were studied. The films of different thicknesses were prepared by vacuum evaporation method (~10-4 Pa) on glass substrates at a substrate temperature of 323 K. The film thickness was measured in situ by a frequency shift of quartz crystal. The thicknesses were 250, 300 and 500 nm. Absorption spectrum of this thin film had been recorded using UV-VIS-NIR spectrophotometer in the photon wavelength range of 300 - 2500 nm. The values of some important optical parameters of the studied films (absorption coefficient, optical band gap energy and refractive index; extinction co-efficient and real and imaginary parts of dielectric constant) were determined using these spectra. Transmittance peak was observed in the visible region of the solar spectrum. Here transmittance showed better result when thicknesses were being increased. The optical band gap energy was decreased by the increase of thickness. The refractive index increased by increasing thickness while extinction co-efficient and real and imaginary part of dielectric constant decreased. DOI: http://dx.doi.org/10.3329/jbas.v37i1.15684 Journal of Bangladesh Academy of Sciences, Vol. 37, No. 1, 83-91, 2013

scholarly journals Optical Properties of Sn Doped ZnO Thin Film Prepared Using Sol-Gel Method for Optical Limiting Application

2021 ◽  
Vol 24 (3) ◽  
pp. 38-42
Author(s):  
Marwa Mudfer Alqaisi ◽  
◽  
Alla J. Ghazai ◽  
Keyword(s):  
Thin Films ◽  
Zinc Oxide ◽  
Optical Properties ◽  
Sol Gel ◽  
Visible Region ◽  
Optical Limiting ◽  
Pure Zinc ◽  
Gel Method ◽  
Sol Gel Method ◽  
Doped Zno

In this work, pure Zinc oxide and tin doped Zinc oxide thin films nanoparticles with various volume concentrations of 2, 4, 6, and 8V/V% were prepared by using the sol-gel method. The optical properties were investigated by using UV-Visible spectroscope, and the value exhibits the direct allowed transition. The average of transmittance was around ~(17-23) %in visible region. The optical energy band gap was calculated with wavelength (300-900) nm for pure ZnO and Sn doped ZnO thin films which decreases with increasing concentration from 3.4 eV to 3.1 eV respectively and red shift. The real dielectric(εr) and the imaginary dielectric εiare the same behavior of the refractive index(n) the extinction coefficient (k) respectively. The optical limiting properties were studied by using an SDL laser with a wavelength of 235 nm. ZnO and doping thin films an found efficient as optic limiting and depend on the concentration of the all samples.

Characteristics of Indium Zinc Oxide Thin Films Deposited by Radio Frequency Reactive Magnetron Sputtering for Solar Cells Application

2007 ◽  
Vol 124-126 ◽  
pp. 999-1002 ◽  
Author(s):  
Han Na Cho ◽  
Jang Woo Lee ◽  
Su Ryun Min ◽  
Chee Won Chung
Keyword(s):  
Thin Films ◽  
Zinc Oxide ◽  
Magnetron Sputtering ◽  
Radio Frequency ◽  
Visible Region ◽  
Film Surface ◽  
Optical Transmittance ◽  
Reactive Magnetron Sputtering ◽  
Reactive Magnetron ◽  
Indium Zinc Oxide

Indium zinc oxide (IZO) thin films were deposited on a glass substrate by radio frequency (rf) reactive magnetron sputtering method. As the rf power increased, the deposition rate and resistivity increased while the optical transmittance decreased owing to the increase of grain size. With increasing gas pressure, the resistivity increased and the transmittance decreased. Atomic force microscopy and scanning electron microscopy were employed to observe the film surface. The IZO films displayed a resistivity of 3.8 × 10-4 Ω cm and a transmittance of about 90% in visible region.

Characterization of Transparent Conducting Pulsed Laser Deposited Films in the Indium Zinc Oxide System

1998 ◽  
Vol 547 ◽  
Author(s):  
A. Rougier ◽  
N. Naghavi ◽  
C. Marcel ◽  
F. Portemer ◽  
L. Dupont ◽  
...  
Keyword(s):  
Thin Films ◽  
Zinc Oxide ◽  
Visible Region ◽  
Pulsed Laser ◽  
Oxide System ◽  
Optical Measurements ◽  
K Value ◽  
Indium Zinc Oxide ◽  
Average Transmittance

AbstractThin films of indium zinc oxide so called IZO were prepared with pulsed laser deposition. It was found that the crystalline structure, the composition and the morphology of the films as well as the optical and electrical properties were quite sensitive to the deposition conditions namely to the temperature and oxygen pressure. The crystallinity of the ZnkIn2O3+k (k from 1 to 5) thin films increases as the substrate temperature increases. An average transmittance of 85 % in the visible region was obtained for any k values. Optical measurements show a continuous decrease of the band gap as the zinc amount increases. The highest conductivity reported is for the ZnIn2O4, thin films deposited at 300 °C (σ = 1.2 103 S/cm). Increasing the amount of Zn (i.e. k value) was found to result in a conductivity decrease. Finally, a good correlation between the electric mobility and the optical mobility is obtained.

scholarly journals Electroluminescent Devices Based on Junctions of Indium Doped Zinc Oxide and Porous Silicon

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
F. Severiano ◽  
G. García ◽  
L. Castañeda ◽  
J. M. Gracia-Jiménez ◽  
Heberto Gómez-Pozos ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Porous Silicon ◽  
Spray Pyrolysis Technique ◽  
Visible Region ◽  
Electrical Characterization ◽  
Ultrasonic Spray Pyrolysis ◽  
Hole Injection ◽  
Electroluminescent Devices ◽  
Ultrasonic Spray Pyrolysis Technique ◽  
Ultrasonic Spray

Electroluminescent devices (ELD) based on junctions of indium doped zinc oxide (ZnO:In) and porous silicon layers (PSL) are presented in this work. PSL with different thicknesses and photoluminescent emission, around 680 nm, were obtained by anodic etching. PSL were coated with a ZnO:In film which was obtained by ultrasonic spray pyrolysis technique. Once obtained, this structure was optically and electrically characterized. When the devices were electrically polarized they showed stable electroluminescence (EL) which was presented as dots scattered over the surface. These dots can be seen with the naked eye. The observed EL goes from the 410 to 1100 nm, which is formed by different emission bands. The EL emission in the visible region was around 400 to 750 nm, and the emission corresponding to the infrared part covers the 750 to 1150 nm. The electrical characterization was carried out by current-voltage curves(I-V)which show a rectifying behavior of the devices. Observed electroluminescent dots are associated with the electron-hole injection into quantized states in PS as well as the emission from the ZnO:In film.

scholarly journals Optoelectronics: Flash-Assisted Processing of Highly Conductive Zinc Oxide Electrodes from Water (Adv. Funct. Mater. 47/2015)

2015 ◽  
Vol 25 (47) ◽  
pp. 7246-7246
Author(s):  
Enrico Della Gaspera ◽  
Danielle F. Kennedy ◽  
Joel van Embden ◽  
Anthony S. R. Chesman ◽  
Thomas R. Gengenbach ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Oxide Electrodes

Synthesis, Characterization, and Photovoltaic Performance of CdO-Based Nano Hybrid Material in Solid-State Dye-Sensitized Solar Cells

2020 ◽  
Vol 18 (1) ◽  
Author(s):  
Arifa Batool ◽  
Syed Mujtaba Shah ◽  
Naimat Ullah ◽  
Hazrat Hussain
Keyword(s):  
Sol Gel ◽  
Photovoltaic Performance ◽  
Dye Sensitized Solar Cells ◽  
Cadmium Oxide ◽  
Visible Region ◽  
Solar Spectrum ◽  
Energy Dispersive ◽  
X Ray ◽  
Vis Spectroscopy ◽  
Cdo Nanoparticles

Abstract Cadmium oxide nanoparticles (NPs) were successfully synthesized through the simple and low-cost sol–gel method. The optical, morphological, compositional, and structural properties of as-synthesized NPs were investigated by ultraviolet–visible (UV/Vis) spectroscopy, fluorescence spectroscopy, scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDX), Fourier transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD) analysis. Absorption spectra of CdO NPs were used for band gaps calculation, which was found to be 2.11 eV. The XRD pattern was used to investigate the purity and crystalline nature of NPs. Morphology and elemental composition were investigated by using SEM and energy-dispersive X-ray spectroscopy (EDX), respectively. FTIR assisted in identifying the functional groups and grafting of the dye on the surface of NPs. These CdO nanoparticles were photosensitized with Ru (II) based Z907 dye. Z907 dye was employed to extend the absorption spectrum of the material to the visible region of the solar spectrum so as to harvest the maximum amount of solar influx on the surface of earth. The energy level diagram revealed that the interaction among the constituents of the nanohybrid assembly permitted the flow of the electron in a cascade manner from dye to CdO nanoparticles. The synthesized photoactive nanohybrid material was thoroughly blended with poly (3-hexylthiophene), a solid electrolyte, and I–V measurements under simulated radiations 1000 W/m2 (AM 1.5) were recorded. A maximum induced photon to the current conversion efficiency of 0.60% was achieved.

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