Properties of Pt-Assisted Electroless Etched Silicon in HF/Na2S2O8 Solution

2009 ◽  
Vol 609 ◽  
pp. 231-237
Author(s):  
N. Megouda ◽  
T. Hadjersi ◽  
O. El Kachai ◽  
R. Boukherroub ◽  
L. Guerbous
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Silicon Surface ◽  
High Resistivity ◽  
Etching Time ◽  
Electroless Etching ◽  
Oxidant Concentration ◽  
Etched Silicon ◽  
P Type ◽  
Scanning Electron

The paper reports on hydrothermal electroless etching of high resistivity p-type Si(100) at 35°C. A thin layer of platinum (Pt) was deposited onto the silicon surface by evaporation under vacuum (~ 10-6 Torr) prior to immersion in a solution of HF/Na2S2O8. The HF concentration was kept at 22.5 M while the concentration of Na2S2O8 was varied from 0.03 to 0.18 M. The etching time was varied from 15 to 75 min. The morphology and optical properties of the etched layer as a function of oxidant concentration and etching time were investigated using scanning electron microscopy (SEM) and photoluminescence measurements.

scholarly journals Effect of Zinc Oxide on the Efficiency Enhancement of Al/Li2O/PSi/Si/Al solar cell

2021 ◽  
Author(s):  
Shahlaa M. Abd Al-Hussan ◽  
Nabeel A. Bakr ◽  
Ahmed N. Abd
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Zinc Oxide ◽  
Porous Silicon ◽  
Lithium Oxide ◽  
Precipitation Method ◽  
Oxide Nanoparticles ◽  
Casting Method ◽  
P Type ◽  
Scanning Electron

Abstract In this paper, electrochemical etching of the p-type silicon wafer is used to prepare p-type porous silicon with current density of 10 mA.cm− 2 for 10 minutes. Field Emission Scanning Electron Microscopy (FESEM) has been used to study porous silicon layer surface morphology. Zinc oxide and lithium oxide nanoparticles are prepared separately by chemical precipitation method and simple precipitation method, respectively and deposited on glass substrates by drop casting method. Moreover,, the structural properties of the films were analyzed by using XRD and SEM. The XRD results showed that the ZnO and Li2O films are polycrystalline with hexagonal wurtzite structure and cubic structure, and preferred orientation along (101) and (003) planes, respectively. Using Scherrer's formula, the crystallite size was measured and it was found that ZnO and Li2O thin films have a crystallite size of 22.04 and 45.6 nm respectively. Surface topography of the prepared thin films is studied by using Scanning Electron Microscopy (SEM). Later, certain proportions of both materials were mixed and deposited on porous silicon using drop casting method at thickness of 1.4 µm. After that, the characteristics of the solar cell were investigated. Mixing zinc oxide nanoparticles in particular proportions with lithium oxide played a major role in increasing the solar cell's performance. The highest prepared film efficiency was obtained at mixing ratio (0.5: 0.5) for (ZnO: Li2O) and its value was (11.09 %).

Study on the Surface Morphologies of Nickel-Phosphorus Ultra-Black Films

2014 ◽  
Vol 924 ◽  
pp. 166-169 ◽  
Author(s):  
Pan Pan Yue ◽  
Yong Zhong Jin ◽  
Xu Dong Hu ◽  
Hong Yang Yan ◽  
Guo Qing Zeng
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Phase Composition ◽  
Chemical Etching ◽  
Etching Time ◽  
X Ray Diffraction ◽  
X Ray ◽  
Black Films ◽  
Surface Morphologies ◽  
Scanning Electron

Ni-P ultra-black films having conical pores with the diameter of ~ 10-30 μm and the depth of ~ 15-30 μm were prepared by chemical etching of electroless plated Ni-P films using 8 mol/L nitric acid at 40 °C for 60 s. The phase composition and microstructure of the film samples were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. The results show that the diameter and depth of the etching pores become larger and the flat top regions bounded by etching pores become smaller by the coalescence of adjacent pores with the increase of etching time. The surface morphologies of the etched Ni-P films are characterized by the distribution of conical pores.

scholarly journals Получение нанокомпозитов МУНТ/MnO-=SUB=-2-x-=/SUB=-, МУНТ/MnO-=SUB=-2-x-=/SUB=-/CuO и исследования их газочувствительных свойств

2019 ◽  
Vol 61 (11) ◽  
pp. 2240
Author(s):  
Ю.А. Стенькин ◽  
В.В. Болотов ◽  
Д.В. Соколов ◽  
В.Е. Росликов ◽  
К.Е. Ивлев
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Copper Oxide ◽  
Photoelectron Spectroscopy ◽  
Room Temperature ◽  
Gas Sensing ◽  
Multiwalled Carbon ◽  
X Ray ◽  
P Type ◽  
Scanning Electron

Nanocomposites based on multiwalled carbon nanotubes (MWCNT) with manganese dioxide (MnO2-x) and copper oxide (CuO) were obtained and investigated. The morphology and elemental composition of MWCNT-layer and nanocomposites MWCNT/MnO2-х, MWCNT/MnO2-х/CuO were studied by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The gas sensing response of MWCNT-layer and nanocomposites upon exposure to hydrogen sulfide (H2S) and nitrogen dioxide (NO2) was demonstrated at room temperature. Effect of increasing the conductivity of MWCNT-layer and nanocomposites upon exposure to NO2 indicates these nanomaterials have conductive of p-type. Copper oxide in nanocomposite significantly enhances the gas sensing response to H2S.

Scanning electron microscopy used to measure the feature dimensions of a nanoscale test pattern on a silicon surface

2011 ◽  
Vol 40 (6) ◽  
pp. 436-440
Author(s):  
V. P. Gavrilenko ◽  
Yu. V. Larionov ◽  
V. B. Mityukhlyaev ◽  
A. V. Rakov ◽  
P. A. Todua ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Silicon Surface ◽  
Test Pattern ◽  
Scanning Electron

Characterization of Si Single Crystals by Conductivity Mode Scanning Electron Microscopy

1975 ◽  
Vol 33 ◽  
pp. 260-261
Author(s):  
H. J. Leamy ◽  
A. J. R. de Kock ◽  
L. C. Kimerling ◽  
S. D. Ferris
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Sem Analysis ◽  
Schottky Barriers ◽  
Type B ◽  
Melt Quenching ◽  
X Ray ◽  
P Type ◽  
Scanning Electron

We have recently examined the microscopic electrical inhomogeneities present in dislocation free, floating zone, Si crystals grown under various conditions by conductivity mode scanning electron microscopy. Schottky barriers produced by evaporation of thin Au-Pd (on N type) or Ti (on P type) electrodes were employed in order to eliminate possible changes in defect structure or electrical activity during production of a diffused junction.Doped and undoped crystals, as well as crystals subjected to special treatments, such as melt quenching were examined in this study. Prior to SEM analysis, each crystal was characterized by preferential etching, Cu or Li decoration, and x-ray topography. All of the defects detected by these methods, save C impurity striations detected via their dilatation of the Si lattice in x-ray topographs, were observed in the SEM experiments. For example, “swirl” defects of both type “A” (large) and type “B” (small) were readily revealed via the enhanced recombination rate of electron beam injected carriers in their vicinity (see Figs. 1 and 2).

scholarly journals Preparation and Characterisation of Metallorganic Precursors Derived Iron Oxides on Porous Silicon Layers

2020 ◽  
Vol 995 ◽  
pp. 63-68
Author(s):  
Sivakumar Balakrishnan ◽  
Yurii K. Gun’ko ◽  
Gerhard F. Swiegers ◽  
Tatiana S. Perova
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Magnetic Nanoparticles ◽  
Porous Silicon ◽  
Iron Oxides ◽  
Silicon Surface ◽  
Scientific Community ◽  
Magnetic Measurements ◽  
Chemical Functionalization ◽  
Scanning Electron

Porous silicon has generated interest in scientific community after its photoluminescence discovery and thereafter, research was focused on to the chemical functionalization of silicon and subsequent anchoring of nanoparticles onto silicon surface. In the present work, the porous silicon has been effectively modified with magnetic nanoparticles which were prepared through metallorganic approach. The as-fabricated magnetic-porous silicon composites were characterised using FTIR and Raman spectroscopies, Scanning Electron Microscopy (SEM) as well as magnetic measurements.

scholarly journals Conjugates of streptavidin with gold nanoparticles for the visualization of dna single interactions on the silicon surface

2014 ◽  
Vol 60 (5) ◽  
pp. 538-542
Author(s):  
G.V. Presnova ◽  
M.Yu. Rubtsova ◽  
D.E. Presnov ◽  
V.G. Grigorenko ◽  
I.V. Yaminsky ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Gold Nanoparticles ◽  
Detection Limit ◽  
Silicon Surface ◽  
Covalent Binding ◽  
Dna Duplexes ◽  
Dna Duplex ◽  
Scanning Electron

The potential of the method of scanning electron microscopy (SEM) to visualize the results of individual acts of DNA and oligonucleotides hybridization using gold nanoparticles as label was investigated. Molecule of biotin was introduced into DNA or oligonucleotide, and then it was detected in DNA duplex using a conjugate of streptavidin with gold nanoparticles. Effective imaging of DNA duplexes was possible using a conjugate prepared by covalent binding.. The detection limit of the model oligonucleotide of 19 bases was 20 pg.

Pathogenesis of Human Hair Defects

1974 ◽  
Vol 32 ◽  
pp. 12-13
Author(s):  
P.S. Porter ◽  
T. Aoyagi ◽  
R. Matta
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Human Hair ◽  
Standard Techniques ◽  
Scanning Electron

Using standard techniques of scanning electron microscopy (SEM), over 1000 human hair defects have been studied. In several of the defects, the pathogenesis of the abnormality has been clarified using these techniques. It is the purpose of this paper to present several distinct morphologic abnormalities of hair and to discuss their pathogenesis as elucidated through techniques of scanning electron microscopy.

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