Theoretical and Experimental Study of UV Detection Characteristics of Pd/ZnO Nanorod Schottky Diodes

NANO ◽  
2017 ◽  
Vol 12 (11) ◽  
pp. 1750137
Author(s):  
Shaivalini Singh ◽  
Pramod Kumar Tiwari ◽  
Hemant Kumar ◽  
Yogesh Kumar ◽  
Gopal Rawat ◽  
...  
Keyword(s):  
Experimental Study ◽  
Indium Tin Oxide ◽  
Uv Light ◽  
Schottky Diodes ◽  
Three Dimensional ◽  
Zno Nanorod ◽  
X Ray Diffraction ◽  
Sem Image ◽  
Glass Substrates ◽  
Current Voltage

In this work, we report theoretical and experimental study of Pd/ZnO nanorod (NR) Schottky diodes-based ultraviolet photodetector (UV-PD). The ZnO-NRs are deposited on indium tin oxide (ITO) coated glass substrates by using a low-temperature hydrothermal method. The surface morphology of the ZnO-NRs film is characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The SEM image shows vertically grown NRs with uniformity, and XRD shows the preferred (002) orientation of ZnO-NR films. The current–voltage characteristics of Pd/ZnO-NR Schottky diodes are studied under dark and UV light. A voltage bias from [Formula: see text]1[Formula: see text]V to [Formula: see text]1[Formula: see text]V is applied and the ratio of photocurrent to dark current was ([Formula: see text] at [Formula: see text][Formula: see text]V) calculated from the [Formula: see text]–[Formula: see text] curve. The value of responsivity was found to be 0.111[Formula: see text]A/W at [Formula: see text][Formula: see text]nm and at [Formula: see text][Formula: see text]V. An approximated UV-PD structure has also been numerically simulated using three-dimensional (3D) device simulator from Visual TCAD of Cogenda International. The simulated [Formula: see text]–[Formula: see text] characteristics have also been plotted under both dark and light conditions. The simulated results are found to be following the nature of experimental results.

OPTICAL CHARACTERIZATION OF ZnO NANOROD ARRAYS GROWN FROM SOLUTION

2010 ◽  
Vol 09 (05) ◽  
pp. 447-451 ◽  
Author(s):  
WALTER WATER ◽  
TE-HUA FANG ◽  
LIANG-WEN JI ◽  
CHING-CHIN LEE
Keyword(s):  
Zno Nanorods ◽  
Zinc Nitrate ◽  
Nitrate Hexahydrate ◽  
Zno Nanorod ◽  
Nanorod Arrays ◽  
Zno Nanorod Arrays ◽  
X Ray Diffraction ◽  
Glass Substrates ◽  
Current Voltage ◽  
Ito Glass

ZnO nanorods were synthesized on ZnO / ITO glass substrates using an aqueous solution of zinc nitrate hexahydrate and hexamethylenetetramine. The effects of hexamethylenetetramine concentration on the crystalline structure and surface morphology of ZnO nanorods were investigated. X-ray diffraction (XRD) and scanning electron microscope (SEM) were used to analyze the crystalline characteristics and microstructures of the nanorod arrays. Ultraviolet/visible spectroscopy and photoluminescence (PL) spectra were used to characterize the optical properties of ZnO nanorods. Larger and brighter photoluminescent ZnO nanorods were obtained from solutions with higher hexamethylenetetramine concentrations. A nanogenerator based on ZnO nanorod arrays was fabricated in the investigation. The nanogenerator's current–voltage characteristics with Schottky-like behavior were discussed.

scholarly journals Schottky Diodes and Thin Films Based on Copolymer: Poly(aniline-co-toluidine)

2009 ◽  
Vol 2009 ◽  
pp. 1-5 ◽  
Author(s):  
A. Elmansouri ◽  
N. Hadik ◽  
A. Outzourhit ◽  
A. Lachkar ◽  
A. Abouelaoualim ◽  
...  
Keyword(s):  
Thin Films ◽  
Indium Tin Oxide ◽  
Electrochemical Polymerization ◽  
Schottky Diodes ◽  
Supporting Electrolyte ◽  
Glass Substrates ◽  
Copolymer Films ◽  
Current Voltage ◽  
Copolymer Poly ◽  
Poly Aniline

Poly(aniline-co-o-toluidine) (PANI-co-POT) thin films were deposited on indium tin oxide- (ITO-) coated glass substrates by electrochemical polymerization under cyclic voltammetric conditions from aniline-co-o-toluidine monomer in an aqueous solution of HCl as a supporting electrolyte. These measurements showed that the optical band gap of the copolymer films is on the order of 2.65 eV. On the other hand, ITO/PANI-co-POT/Al devices were fabricated by thermal evaporation of Aluminum circular electrodes on the as-deposited PANI-co-POT films. The Current-Voltage characteristics of these devices are nonlinear. The diode parameters were calculated from I-V characteristics using the modified Shockley equation. The C-F characteristics were also measured.

Electrodeposition of Cu2O Particles by Using Electrolyte Solution Containing Glucopone as Surfactant

2009 ◽  
Vol 1 (2) ◽  
pp. 18-20
Author(s):  
Dahyunir Dahlan
Keyword(s):  
Indium Tin Oxide ◽  
Pulse Current ◽  
Platinum Electrode ◽  
Saturated Calomel Electrode ◽  
X Ray Diffraction ◽  
X Ray ◽  
Glass Substrates ◽  
Continuous Current ◽  
Oxide Particles ◽  
Cupric Sulphate

Copper oxide particles were electrodeposited onto indium tin oxide (ITO) coated glass substrates. Electrodeposition was carried out in the electrolyte containing cupric sulphate, boric acid and glucopone. Both continuous and pulse currents methods were used in the process with platinum electrode, saturated calomel electrode (SCE) and ITO electrode as the counter, reference and working electrode respectively. The deposited particles were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). It was found that, using continuous current deposition, the deposited particles were mixture of Cu2O and CuO particles. By adding glucopone in the electrolyte, particles with spherical shapes were produced. Electrodeposition by using pulse current, uniform cubical shaped Cu2O particles were produced

Effect of Substrate Temperature on the Electrochromic Properties of Cobalt Hydroxide Thin Films Prepared by Reactive Sputtering

2011 ◽  
Vol 1328 ◽  
Author(s):  
KyoungMoo Lee ◽  
Yoshio Abe ◽  
Midori Kawamura ◽  
Hidenobu Itoh
Keyword(s):  
Thin Films ◽  
Substrate Temperature ◽  
Indium Tin Oxide ◽  
Large Change ◽  
Amorphous Structure ◽  
Cobalt Hydroxide ◽  
X Ray Diffraction ◽  
X Ray ◽  
Glass Substrates ◽  
Substrate Temperatures

ABSTRACTCobalt hydroxide thin films with a thickness of 100 nm were deposited onto glass, Si and indium tin oxide (ITO)-coated glass substrates by reactively sputtering a Co target in H2O gas. The substrate temperature was varied from -20 to +200°C. The EC performance of the films was investigated in 0.1 M KOH aqueous solution. X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy of the samples indicated that Co3O4 films were formed at substrate temperatures above 100°C, and amorphous CoOOH films were deposited in the range from 10 to -20°C. A large change in transmittance of approximately 26% and high EC coloration efficiency of 47 cm2/C were obtained at a wavelength of 600 nm for the CoOOH thin film deposited at -20°C. The good EC performance of the CoOOH films is attributed to the low film density and amorphous structure.

A new luminescent host material K3GdB6O12: synthesis, crystal structure and luminescent properties activated by Sm3+

2018 ◽  
Vol 233 (6) ◽  
pp. 411-419 ◽  
Author(s):  
Dan Zhao ◽  
Cong-Kui Nie ◽  
Ye Tian ◽  
Bao-Zhong Liu ◽  
Yun-Chang Fan ◽  
...  
Keyword(s):  
Solid State ◽  
Uv Light ◽  
Three Dimensional ◽  
Visual Display ◽  
Luminescent Properties ◽  
Molar Ratio ◽  
X Ray Diffraction ◽  
Promising Candidate ◽  
Conventional Solid State Reaction ◽  
Host Matrix

Abstract A new borate compound K3GdB6O12 has been prepared using a high temperature flux method and structurally characterized by single crystal X-ray diffraction analysis. The structure can be described as a three-dimensional framework that is composed of [B5O10]5− groups, K+ ions and Gd3+ ions. In this structure, one crystallographic distinct site is mixed occupied by K and Gd atoms at the molar ratio of 1:1. Furthermore, Sm3+ ion was used as the activator to test primary of K3GdB6O12 to be used as a luminescent host matrix. A series of phosphors K3Gd1−xB6O12:xSm3+ were synthesized by conventional solid-state reaction. The photoluminescence properties and concentration quenching of the prepared phosphors were investigated. The results show that K3Gd1−xB6O12:xSm3+ can be efficiently excited by near-UV light. K3Gd1−xB6O12:xSm3+ might be a promising candidate for visual display and solid-state lighting as an orange emission phosphor.

K3Eu5(PO4)6: hydrothermal synthesis, crystal structure and photoluminescence properties

2019 ◽  
Vol 75 (7) ◽  
pp. 883-890 ◽  
Author(s):  
Ya-Li Xue ◽  
Ai-Yun Zhang ◽  
Xiao-Yang Han ◽  
Xiao-Qi Cui ◽  
Ling Deng ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Hydrothermal Synthesis ◽  
Uv Light ◽  
Three Dimensional ◽  
Visible Region ◽  
Monoclinic Space Group ◽  
Photoluminescence Properties ◽  
X Ray Diffraction ◽  
Strong Luminescence ◽  
Light Excitation

An anhydrous orthophosphate, K3Eu5(PO4)6 (tripotassium pentaeuropium hexaphosphate), has been prepared by a high-temperature solid-state reaction combined with hydrothermal synthesis, and its crystal structure was determined by single-crystal X-ray diffraction analysis (SC-XRD). The results show that the compound crystallizes in the monoclinic space group C2/c and the structure features a three-dimensional framework of [Eu5(PO4)6]∞, with the tunnel filled by K+ ions. The IR spectrum, UV–Vis spectrum and luminescence properties of polycrystalline samples of K3Eu5(PO4)6, annealed at temperatures of 650, 700, 750, 800 and 850 °C, were investigated. Although with a full Eu3+ concentration (9.96 × 1021 ions cm−3), the self-activated phosphor K3Eu5(PO4)6 shows s strong luminescence emission intensity with a quantum yield of 37%. Under near-UV light excitation (393 nm), the series of samples shows the characteristic emissions of Eu3+ ions in the visible region from 575 to 715 nm. The sample sintered at 800 °C gives the strongest emission and its lifetime sintered at 800 °C (1.88 ms) is also the longest of all.

Optically Transparent of N-ZnO/p-NiO Heterojunction for Ultraviolet Photodetector Application

2011 ◽  
Vol 687 ◽  
pp. 711-715 ◽  
Author(s):  
Shu Yi Tsai ◽  
Min Hsiung Hon ◽  
Yang Ming Lu
Keyword(s):  
Zno Films ◽  
X Ray Diffraction ◽  
Glass Substrates ◽  
Voltage Curve ◽  
Current Voltage ◽  
Current Voltage Curve ◽  
Order Of Magnitude ◽  
Uv Visible ◽  
Diode Behavior ◽  
P Type

Transparent p–n heterojunction diodes consisting of n-type ZnO and p-type NiO thin films were prepared on glass substrates by r.f. magnetron sputtering. The structural and optical properties of the n-ZnO/p-NiO heterojunction were characterized by X-ray diffraction (XRD), UV–visible spectroscopy, Hall measurement, and I-V photocurrent measurements. The XRD shows that ZnO films are highly crystalline in nature with preferred orientation along the (0 0 2) orientation. The optical transmittances of ZnO and NiO films are 87% and 80%, respectively. The current–voltage curve of the heterojunction demonstrates obvious rectifying diode behavior in a dark environment. The lowest of leakage current is 7.73x10−8 A/cm2 for n-ZnO/p-NiO heterojunction diode. Upon UV irradiation, it was found that the detector current was increased by more than one order of magnitude. It was also found that the corresponding time constant for turn-on transient was τon = 27.9 ms while that for turn-off transient was τoff= 62.8 ms.

Growth and Characterisation of Ag2S Films on ZnS/Indium-Tin-Oxide Coated Glass

2013 ◽  
Vol 721 ◽  
pp. 33-36 ◽  
Author(s):  
Hong Cheng Pan ◽  
Xue Peng Li ◽  
Wei Hong Liu ◽  
Yan Bin Ren
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Phosphate Buffer Solution ◽  
Deposition Method ◽  
X Ray Diffraction ◽  
Buffer Solution ◽  
Solution Ph ◽  
X Ray ◽  
Coated Glass ◽  
Glass Substrates

ZnS thin films were deposited on indium–tin-oxide (ITO) coated glass substrates by a chemical bath deposition method. Then the ZnS/ITO slides were immersed in the solution containing 6 mM phosphate buffer solution (pH 7.4), sodium polyacrylate (0.01% w/w), and 0.24 mM AgNO3 at 37°C for 3 h to growth Ag2S films on the surface of ZnS/ITO slides. The absorption band of Ag2S/ZnS/ITO slide displays a considerably blue-shifted. The X-ray diffraction analysis demonstrated the presence of acanthite Ag2S on the surface of ZnS/ITO slides, which is consistent with the cyclic voltammetic data.

Fabrication of 3D photocatalytic α-Fe2O3 structure using direct ink writing method

2014 ◽  
Vol 28 (07) ◽  
pp. 1450051 ◽  
Author(s):  
Yayun Li ◽  
Bo Li ◽  
Longtu Li
Keyword(s):  
Uv Light ◽  
Three Dimensional ◽  
Bulk Sample ◽  
Potential Method ◽  
Optical Microscope ◽  
Solid Content ◽  
X Ray Diffraction ◽  
Direct Ink Writing ◽  
Shaping Process ◽  
Better Than

Three-dimensional (3D) photocatalytic devices are economical and environmental, since they can be easily recycled and reused. In this paper, a kind of 3D photocatalytic device with a rod diameter of 250 μm was fabricated using the aqueous-based α- Fe 2 O 3 ceramic inks by direct ink writing (DIW) method. The properties of the DIW woodpile samples were investigated by X-ray diffraction (XRD), scanning electron microscope (SEM) and optical microscope. The result shows that the ink with solid content of 71.4 wt.% exhibits a shear thinning behavior and proper viscoelastic properties, which ensure a feasible extrusion in the whole shaping process. The sample sintered at 800°C in air causes photocatalytic degradation of methylene blue (MB) solution under the ultraviolet (UV) light. The photocatalytic properties of the α- Fe 2 O 3 woodpile structure was characterized by the UV-visible light spectrophotometer, and it was found to be better than that of bulk sample with same weight for its higher specific surface. The DIW technique would offer a potential method for the design and fabrication of 3D photocatalytic devices.

Electrochromic Nickel Oxide-Based Thin Films Deposited by Chemical Bath

2008 ◽  
Vol 55 ◽  
pp. 24-29 ◽  
Author(s):  
Arturo Mendoza-Galván ◽  
M.A. Vidales-Hurtado
Keyword(s):  
Thin Films ◽  
Nickel Oxide ◽  
Indium Tin Oxide ◽  
Nitrate Solution ◽  
Visible Range ◽  
Phase Identification ◽  
X Ray Diffraction ◽  
Optical Contrast ◽  
Glass Substrates

Nickel oxide-based thin films were deposited onto indium-tin oxide (ITO) coated glass substrates by the chemical bath method. The synthesis, based on the decomposition of urea in an aqueous nickel nitrate solution, promotes the deposition of the turbostratic -Ni(OH)2 phase. The electrochromic behavior of films obtained from low and high urea concentrations was tested after air annealing at temperatures of 250 and 300 °C. Using cyclic voltammetry, chronoamperometry and in-situ single wavelength transmittance it is shown that the films exhibit good reversibility and coloration efficiency. Transmittance spectra in the visible range show the high optical contrast of the films. It was found that in films annealed at 250 °C the bleached-colored switching is between the Ni(OH)2 and -NiOOH phases. Films annealed at 300 °C are comprised by a Ni(OH)2-NiO mixture and Ni2O3 units or the -NiOOH phase are responsible for coloring depending on urea concentration in solution. The -NiOOH phase was clearly identified in over-colored films. X-ray diffraction, Raman scattering, and infrared reflectance were used for phase identification.

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