Hamad A. Albrithen

Hamad A. Albrithen
King Saud University | KKUH · Department of Physics and Astronomy

PhD in Physics

About

89
Publications
11,174
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1,267
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January 2004 - June 2019
King Saud University
Position
  • Professor (Associate)

Publications

Publications (89)
Article
MgSnN2 thin films were deposited by reactive magnetron co-sputtering on fused silica and silicon substrates. The properties of the films were determined as a function of the deposition temperature. Although the films exhibited a strong preferred orientation along the [002] direction, cumulative X-ray diffractograms at various χ angles evidenced tha...
Article
This review summarized the applied techniques and applied nanomaterials (NMs) for the progress of latent fingerprints (LFPs) images on several surfaces. Used numerous types of NMs and their benefits along with their quality of the LFPs images on the porous and non-porous substrates. Several conventional techniques used for the examining of FPs pict...
Article
Full-text available
FA0.95MA0.05Pb(Br0.02I0.98)3(CsI)x (x = 0, 0.02, 0.05, 0.07) thin films were formed in a dry air atmosphere. The influence of different ratios of CsI-doping on the formed phases, crystallinity, emitted colors and different optical parameters were explored in detail. The spectroscopic ellipsometry (SE) spectra were analyzed using the Kramers–Kronig...
Article
In this study, we investigated the effect of the thickness of metal-dioxide thin films on silicon (Si) micro-electromechanical systems (MEMS) for sensitive, accurate, and reproducible detection of gamma-radiation dose. Silicon wafers and microcantilevers were coated with various thicknesses of titanium dioxide (TiO2) thin films and controlled by th...
Article
Microchannel resonators containing a miniaturized volume of a solution can have various applications in different fields. In this study, a microchannel cantilever was loaded with a solution containing a very small number of Pseudomonas fluorescens bacteria suspended in M9 growth medium. The liquid-filled microchannel cantilever was irradiated with...
Article
Herein, we investigate the potential of using gold nanoparticle (AuNP)-functionalized microcantilever surfaces for gamma radiation detection. For this investigation, Si microelectromechanical system-based cantilevers and Si wafers are used. All the samples were irradiated using a⁶⁰Co gamma source at different radiation doses (kGy). Using scanning e...
Article
Full-text available
This study generally relates to nuclear sensors and specifically to detecting nuclear and electromagnetic radiation using an ultrasensitive quartz tuning fork (QTF) sensor. We aim to detect low doses of gamma radiation with fast response time using QTF. Three different types of QTFs (uncoated and gold coated) were used in this study in order to inv...
Article
Full-text available
There is an ongoing surge of interest in the use of formamidinium (FA) lead iodide perovskites in photovoltaics due to their exceptional optoelectronic properties. However, thermodynamic instability of the desired cubic perovskite (α-FAPbI3) phase at ambient conditions leads to the formation of a yellow non-perovskite (δ-FAPbI3) phase that compromi...
Article
This article describes a simple non-faradaic impedimetric sensor comprised of L-Cysteine self-assembled on top of an interdigitated gold electrode for the direct detection of lead ions (Pb(II)) in tap water. The sensor consists of only two electrodes and does not require redox probe during detection. During the detection of Pb(II) in tap water, cha...
Article
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ZnO and MgZnO nanoparticles were prepared by the co-precipitation method utilizing zinc sulfate heptahydrate and magnesium sulfate heptahydrate; structural measurements were also carried out. An x-ray diffraction (XRD) study indicated that no peaks for other possible phases such as MgO or MgZn intermetallic compounds indicating pure wurtzite struct...
Article
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The performance of perovskite solar cells is highly dependent on the fabrication method; thus, controlling the growth mechanism of perovskite crystals is a promising way towards increasing their efficiency and stability. Herein, a multi‐cation halide composition of perovskite solar cells is engineered via the two‐step sequential deposition method....
Article
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In this work, we investigate the potential of exploiting TiO2 thin films as sensing layers on silicon micro-electromechanical systems for the detection of gamma radiations. All samples are exposed to gamma rays produced by ⁶⁰Co, with different doses ranging from 0 kGy to 40 kGy. Properties of silicon coated with a 200-nm-thick layer of TiO2 grown a...
Article
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Altering the surface morphology is an approach that is commonly used to enhance desired properties. Femtosecond laser was used to fabricate sub-microgrooves at an average laser power of 31 mW with different scan speeds for a wavelength of 1026 nm. The effect of the laser wavelength on the sub-microstructure fabrication was also studied using 342 an...
Patent
Full-text available
A metal oxide-based radiation sensor includes a titanium dioxide (TiO2) thin film layer on a microcantilever surface. The TiO2 thin film layer initially comprises anatase and rutile crystal structures. Exposure to radiation, such as gamma radiation, results in changes in structural features and mechanical behaviors of the metal oxide-based radiatio...
Article
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A femtosecond laser can be used to fabricate microstructures on a silicon microcantilever surface with high precession and minimal sidewall defects. The aim of this study is to investigate the effect of the creation of microgrooves and sub-microgrooves on the resonance frequency, quality factor, and spring constant of a silicon microcantilever. A s...
Article
Full-text available
The optical response of a graphene oxide integrated silicon micro-ring resonator (GOMRR) to a range of vapour phase Volatile Organic Compounds (VOCs) is reported. The response of the GOMRR to all but one (hexane) of the VOCs tested is significantly higher than that of the uncoated (control) silicon MRR, for the same vapour flow rate. An iterative F...
Article
Surface texturing of silicon has a wide range of applications in various industries such as microelectronics and medical devices. This work aims to fabricate micro-channels on the silicon surfaces using femtosecond laser micromachining technique. Single pass of femtosecond laser wavelength of 1026 nm was focused on the surfaces by 4x objective that...
Article
Full-text available
Melanin is an important class of biological pigments because of its distinct chemical and physical properties. The electrochemical deposition of natural melanin thin films was studied using two different techniques; constant potential and cyclic voltammetry along with a deposition time of five hours. The thin films deposited electrochemically on a...
Article
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In this work, we investigate the optical properties of InAs quantum dots (QDs) capped with composite In0.15Al0.85As/GaAs0.85Sb0.15 strain-reducing layers (SRLs) by means of high-resolution X-ray diffraction (HRXRD) and photoluminescence (PL) spectroscopy at 77 K. Thin In0.15Al0.85As layers with thickness t = 20 Å, 40 Å, and 60 Å were inserted betwe...
Article
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Chemical doping of inorganic-organic hybrid perovskites is an effective way of improving the performance and operational stability of perovskite solar cells (PSCs). Here we use 5-ammonium valeric acid (AVAI) to chemically stabilize the structure of α-FAPbI3. Using solid-state MAS NMR, we demonstrate the atomic-level interaction between the molecula...
Article
In this study, optical characterization of vanadium oxide (VOx) thin film is performed using a variable angle spectroscopic ellipsometer (VASE). The characterization is performed at four different room temperatures, 25.5–28.5 °C, in steps of 1 °C. The best fitting results of the ellipsometric parameters φ and Δ are obtained by using a GenOsc layer...
Article
Melanin is an organic semiconductor from a broad class of functional macromolecules found in nature. It has hybrid properties of an amorphous semiconductor. However, natural melanin has not been widely studied; this is partially due to the lack of processing methods, as melanin is generally extracted and measured as a powder. Thus, better electrica...
Article
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The high conversion efficiency has made metal halide perovskite solar cells a real breakthrough in thin film photovoltaic technology in recent years. Here, we introduce a straightforward strategy to reduce the level of electronic defects present at the interface between the perovskite film and the hole transport layer by treating the perovskite sur...
Article
We comparatively analyzed the impact of halide and non‐halide sources of guanidinium cations, including guanidinium chloride ((NH2)3CCl = GCl) and guanidinium thiocyanate ((NH2)3CSCN = GTC) on the structural, morphological and photophysical properties of (CsMAFA)PbBrxI3−x (x = 0.17) (MA = methylammonium, FA = formamidinium) perovskite films. X‐ray...
Article
Full-text available
Here, we developed an efficient infrared (IR) detector comprising reduced graphene oxide (RGO) and carbon nanoparticles (CNPs) for detecting human body IR radiation under ambient conditions. The RGO/CNP nanocomposite thin-film based photodetectors were assembled via a simple solution-phase cost-effective route with different concentrations of RGO s...
Article
Full-text available
Ti-6Al-4V and Mg-AZ31 were bonded together using the Transient Liquid Phase Bonding Process (TLP) after coating both surfaces with zinc. The zinc coatings were applied using the screen printing process of zinc paste. Successful bonds were obtained in a vacuum furnace at 500 • C and under a uniaxial pressure of 1 MPa using high frequency induction h...
Article
Structural, electronic, and optical properties of wurtzite BeO under biaxial in-plane strain are investigated using first principles calculations. The present calculations are based on all the electrons’ Full-Potential Linearized Augmented Plane Wave plus local orbital (FP-LAPW + lo). The planar strain is introduced to investigate the bonding chara...
Article
In this study, pulsed laser ablation technique, also known as pulsed laser deposition (PLD), is used to design and grow ZnO nanostructures (nanoworms, nanowalls, and nanorods) by template/seeding approach for gas‐sensing applications. Conventionally, ZnO nanostructures used for gas sensing have been usually prepared via chemical route, where the 3D...
Article
In this study, we investigate several impurities in bulk GaN crystals grown by the sodium flux technique. In our system, black GaN is in general associated with oxygen, sodium, and molybdenum concentrations in excess of 10¹⁹ atoms/cm³. Here, we report on the correlation of high levels of oxygen with opaque crystals. Samples that contain oxygen conc...
Article
In this paper, titanium dioxide (TiO2) thin films, deposited on single crystal Si (111) substrates under different temperature conditions by Atomic Layer Deposition (ALD), have been systematically studied by X-ray diffraction, photoluminescence spectroscopy and spectroscopic ellipsometry methods. X-ray diffraction analysis showed that the prepared...
Article
We report the direct observation of a theoretically predicted magnetic ground state in a monolayer Fe on Rh(111), which is referred to as an up-up-down-down (↑↑↓↓) double-row-wise antiferromagnetic spin structure, using spin-polarized scanning tunneling microscopy. This exotic phase, which exists in three orientational domains, is revealed by exper...
Article
0.11 Ga 0.89 As overgrown layers on the optical properties of InAs/GaAs quantum dots grown by molecular beam epitaxy has been studied. The results of photoluminescence, high resolution X-ray diffraction, atomic force microscopy, power and temperature-dependent photoluminescence from 77 K to 300 K have been correlated to characterize the grown sampl...
Article
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The parameters of pulsed laser deposition (PLD) have been optimized to design different nanostructures of Strontium-alloyed zinc oxide (SrZnO). In this work, SrZnO nanostructures are grown on <0001>Al2O3 substrates via two-step templating/seeding approach. In the temperature range between 300 - 750 oC and O2 background pressures between 0.01 and 10...
Article
In2O3 micro-rods consisting of In2O3 rods with pyramid-like shape structures on top were synthesized on Au-catalyzed quartz substrates, via a vapor-solid process by a controlled vapor transport method. It was found that the Au catalyst and vapor-solid mechanism played an important role in the growth process and the growth phenomena in these structu...
Article
In2O3 rods with dodecahedron In2O3 microcrystals on top were synthesized in an electrical furnace via Au-catalyzed vapor transport process. A catalyst-assisted selective vapor-solid (VS) growth was proposed to explain the formation of the dodecahedron In2O3 microcrystal, while the self-catalytic VS growth mechanism dominated the subsequent one-dime...
Article
Full-text available
We have discovered a structural transition for the SrZnO alloy films from a wurtzite to a rock-salt structure, leading to a re- duction in the (1120)/(0001) surface energy ratio. The films were grown by pulsed laser deposition using different SrO ratios, x. We have revealed that growth at a higher temperature, 750°C, resulted in a sharp 0002 peak a...
Article
We have investigated the effect of antimony incorporation in GaAsSb as a capping layer on the optical properties of InAs quantum dots grown by Molecular Beam Epitaxy. Atomic Force Microscopy (AFM), High Resolution X-Ray Diffraction (HRXRD), photoluminescence (PL) and power dependent PL at 77K and 300K have been used for the characterization of the...
Article
The pulsed laser deposition (PLD) technique is used to grow Al-doped ZnO (AZO) thin films at 500 °C on silicon substrates under vacuum or oxygen gas background from ablating AZO nanoparticle targets synthesized via the sol-gel process. The structural, morphological and optical properties were characterized by using X-ray diffraction (XRD), scanning...
Article
Though several methods exist to produce bulk crystals of gallium nitride (GaN), none have been commercialized on a large scale. The sodium flux method, which involves precipitation of GaN from a sodium-gallium melt supersaturated with nitrogen, offers potentially lower cost production due to relatively mild process conditions while maintaining high...
Article
The mechanism for the growth of 3D ZnO nanowall networks in nest-like structure by a pulsed laser deposition (PLD) technique have been investigated for dye sensitized solar cells (DSSCs) and biosensor applications. As complex oxides shift towards large volume productions and practical applications, PLD offers a good advantage over other techniques...
Article
We have grown the nanostructure Mn-doped CdO films by sol–gel spin coating method. The structural and morphology properties of the Mn doped CdO films were characterized by atomic force microscopy and X-ray diffraction method. The Mn doped CdO films are formed from the nanoparticles and the particle size is controlled with manganese content. The cry...
Article
Full-text available
In this paper, we report on investigation concerning the substrate-dependent thermal conductivity (k) of Aluminum Nitride (AlN) thin-films processed at low temperature by reactive magnetron sputtering. The thermal conductivity of AlN films grown at low temperature (<200 °C) on single-crystal silicon (Si) and amorphous silicon nitride (SiN) with thi...
Article
In this article, a photo sensor based on reduced graphene oxide (RGO) and p-silicon has been fabricated. The structural property of the synthesized RGO was confirmed using X-ray diffraction and Fourier transform infrared spectroscopy. The presence of (002) peak in the X-ray diffraction patterns of RGO at 10.63° indicates that graphite was exfoliate...
Article
We have investigated sub-monolayer iron deposition on atomically smooth GaN(0001) pseudo-1 × 1 (1+112). The iron is deposited at a substrate temperature of 360 °C, upon which reflection high energy electron diffraction shows a transformation to a 3×3-R30° pattern. After cooling to room temperature, the pattern transforms to a 6 × 6, and scanning tu...
Article
The electrical characterization of Al/NiFe2O4/p-Si/Al photodiode was investigated by current–voltage and capacitance-voltage characteristics. The barrier height and ideality factor magnitudes of the Al/NiFe2O4/p-Si/Al diode were found to be 0.82 and 5.2 eV, respectively. The optical properties of the NiFe2O4 film have been investigated and the opti...
Article
We have investigated structural, electronic and optical properties of Ba1-xZnxO alloy in the range of (0 <= x <= 1) in the zinc-blende phase. The all-electron full potential linearized augmented plane wave (FP-LAPW) method implemented in WIEN2k code was utilized in these calculations. Structural optimization of Ba1-xZnxO alloy for the compositions...
Conference Paper
We report the dry etch of GaSb(001) by inductively coupled plasma reactive ion etcher. Silicon Oxide, deposited by PECVD, was used as a mask. The oxide layer proved to be almost unaffected compared to the GaSb, when using chlorine compound gases as etchants (Cl 2, BCl 3, and SiCl 4) as well as argon. This provides high selectivity for GaSb to the m...
Article
Cadmium Sulphide (CdS) thin films have been prepared on ultrasonicated glass substrates using a specially designed chemical bath deposition technique via isochronal synthesis. The structural properties have been determined through XRD. The nanostructures have been identified in FE-SEM images. The chemical analysis has been carried out through EDAX....
Article
Iron/gallium nitride bi-layer structures have potential use for spintronic applications. Therefore, we have carried out an investigation of the initial phase of sub-monolayer iron growth on GaN(0001) pseudo-1x1-1+1/12 surface. To begin with, we verified an atomically smooth GaN growth surface with the assistance of in situ reflection high energy el...
Article
Amorphous indium boron nitride (a-InBN) thin films were successfully fabricated using radio frequency (RF) magnetron sputtering, and were deposited onto fused silica and c-Si(100) substrates. Sputtering was achieved using a target of polycrystalline B and In species with B/In nominal at.% ratio of 25/75 under the flow of nitrogen. The structure and...
Article
Full-text available
Cubic GaN has been grown under gallium Ga-rich growth conditions using radio frequency nitrogen plasma molecular beam epitaxy on MgO001 substrates. Reflection high energy electron diffraction patterns indicate the smoothness of the c-GaN surface and show 2 and even 8 periodicities after the growth at sample temperature T s 200 ° C and 1 1 at higher...
Article
Full-text available
Cr doped GaN was grown by rf N-plasma molecular beam epitaxy on sapphire (0001) at a sample temperature of 700 o C. Cr/Ga flux ratio was set to a value from 5% to 20%. Subsequently, scanning tunneling microscopy was performed on these surfaces. Cr incorporates on the GaN surface at 700 o C at a Cr concentration of 5% and less. By increasing the Cr/...
Article
Currently there is much interest in the magnetic properties of magnetically-doped nitride semiconductors. For purposes of doping GaN with Mn or Cr, it is important to investigate the action of these dopants on the clean surface under epitaxial growth conditions. In this study, we investigate the surface of GaN which has been doped with Cr during mo...
Article
The intrinsic structures of semiconductor surfaces are important for epitaxial growth and future applications. Here we present a scanning tunneling microscopy study of the clean zinc-blende GaN(001) surface, free from the presence of arsenic. We find a sequence of reconstructions for the clean surface, beginning with 4x3 and including c(4x12), 4x7,...
Article
Here, we report the influence of the growth conditions for CrGaN grown with the N-polarity on sapphire (0 0 0 1) using radio frequency N plasma-assisted molecular beam epitaxy. Samples are grown under different Ga/N flux ratio of 0.65–1.0 at substrate temperatures of 650 and . The Cr/Ga flux ratio is set to either 3% or 5%. These growth parameters...
Article
Full-text available
Scanning tunneling microscopy images confirm electron diffraction studies that the zinc-blende GaN(001)-4x reconstruction consists of rows aligned along [110] with a spacing along [110] of 4a. Dual-bias imaging shows a 180 degree shift of the corrugation maximum position between the profiles of empty and occupied states, in agreement with surface s...
Article
Full-text available
The phase transformation of a (001)-oriented ?MnN thin film grown by molecular beam epitaxy to ?Mn3N2 has been investigated using a combination of diffraction analysis and real-space surface analysis by scanning tunneling microscopy. The ?MnN thin film is prepared by growth at 450 °C; it is then annealed at 550 °C. It is found that the phase transf...
Article
MnGaN has been grown by radio frequency N plasma-assisted molecular beam epitaxy. MnGaN samples were grown on MOCVD GaN(0001)/sapphire(0001) at substrate temperature of 550 °C under different Ga/N flux ratios leading to 4 different growth regimes: N-rich, slight metal-rich, metal-rich, and Ga-rich. It is found that in the case of MnGaN, Mn incorpor...