M.H. Abdullah

M.H. Abdullah
Universiti Teknologi MARA | UiTM · Faculty of Electrical Engineering

About

33
Publications
2,591
Reads
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154
Citations
Citations since 2016
1 Research Item
75 Citations
2016201720182019202020212022024681012
2016201720182019202020212022024681012
2016201720182019202020212022024681012
2016201720182019202020212022024681012

Publications

Publications (33)
Article
Full-text available
This study synthesized pristine and aluminum (Al)-doped zinc oxide (Al:ZnO) nanostructures through a simplistic low-temperature ultrasonicated solution immersion method. Al:ZnO nanostructures were synthesized as a sensing material using different immersion times varying from two to five hours. The Al:ZnO nanostructured-based flexible humidity senso...
Article
The fabrication (ss-DSSC) were done by employing the iodine doped CuI (I2: CuI) as the hole conductors. The hole conductor deposition was done by varying the I2: CuI weight in order to investigate its effect to the device performance. The brick-like structure with smooth faces and sharp edges were seen for the doped thin films and. The high electri...
Article
Boron doped heterojunction of amorphous carbon solar cell were successfully fabricated using palm oil precursor in the environment of low negative bias. The open circuit voltage (Voc), current density (JSC), fill factor (FF) and efficiency (%) of boron doped without the use of negative bias (a-C/n-Si) were approximately 0.128244, 0.452821mA/cm2, 0....
Data
Full-text available
Article
Full-text available
Germanium (Ge) nanocrystals were synthesized by rapid thermal processing (RTP) of radio frequency sputtered Ge on silicon (100) substrate. A Si capping layer of 185 nm thickness was deposited onto the 225 nm Ge layer. The layered samples subsequently underwent annealing during RTP at 900 �C for 30, 45, and 60 s to subsequently evolve into Ge island...
Article
We demonstrate that a graded index TiO2 antireflective compact layer (arc-TiO2) employed by RF sputtering can modulate the optical transmittance and reduce the electron recombination in dye-sensitized solar cell (DSSC). The spectral response of the DSSC is improved, due to higher and red-shifted transmittance spectra in a specific region that favou...
Article
In this work, a thermally stable multilayered transparent conducting oxide (TCO) utilizing ZnO antireflective thin film (arc-ZnO) has been prepared by RF magnetron sputtering. The novel ITO/arc-ZnO conducting substrate with blocking layer capabilities has been designed using step-down interference coating structure based on double layer antireflect...
Article
In this work, TiO2/ZnO nanocomposite films were prepared by simultaneous RFmagnetron sputtering of ZnO and TiO2 targets. The influences of annealing temperature on the properties of the TiO2/ZnO films were investigated. The crystal structure of the deposited TiO2/ZnO films was hexagonal wurtzite at (002) and (101) peaks and the films were highly or...
Article
A specially tailored index TiO2 compact layer (arc-TiO2) has been successfully deposited to serve as photoanode of a dye-sensitized solar cell (DSSC) by radio-frequency magnetron sputtering. The employment of the TiO2 compact layer in the DSSC was systematically investigated by means of UV-absorption spectra, incident photon to current efficiency (...
Conference Paper
A novel gradient index antireflective TiO2 compact layer (arc-TiO2) that can improve transmittance and prevent charge recombination has been developed for dye-sensitized solar cells by radio frequency magnetron sputtering. Effects of the presence of arc-TiO2 compact layer to the performance improvement of a DSSC were compared to that of a sol-gel d...
Conference Paper
In this work, TiO2 photoanode have been prepared by mixing the commercial titania powder P-25 with a titanium sol gel. In order to improve the mixing condition the paste was gone through the ultrasonic treatment. After that, the doctor blade technique was used to deposit TiO2 paste on ITO-coated glass substrate. There were two monolayer photoanodes...
Article
A thermally stable multilayered transparent conducting oxide utilizing nanocomposite ZnO:TiO2 antireflection thin film (arc-ZnO:TiO2) on an indium–tin oxide (ITO) substrate has been prepared by radio frequency-magnetron sputtering. The effects of post-deposition annealing on the morphological, structural, optical and electrical properties were inve...
Article
A novel antireflective TiO2 compact layer (arc-TiO2) that can improve transmittance is employed by radio frequency sputtering at the interface between ITO and porous-TiO2. Effects of the absence and presence of the TiO2 layer were mainly investigated by means of incident photon-to-current efficiency (IPCE), open-circuit voltage decay (OCVD) and ele...
Conference Paper
Graded index TiO2 compact layer (arc-TiO2) that improved transmittance and reduced electron recombination in dye-sensitized solar cell (DSSC) is employed by RF sputtering. Effects of arc-TiO2 prepared at various RF sputtering power to the performances of DSSC were investigated by means of open-circuit voltage decay (OCVD) and electrochemical impeda...
Conference Paper
Graded index TiO2 dense film that can improve transmittance is employed at the interface between the indium-tin-oxide (ITO) and nanocrystalline-TiO2 by radio-frequency magnetron sputtering. The employment of the d-TiO2 film in the dye sensitized solar cell was investigated by means of optical properties (UV-absorption and transmittance spectra) and...
Article
A novel antireflective TiO2 compact layer (arc-TiO2) that can reduce electron recombination and improve transmittance was deposited by RF magnetron sputtering at the interface between indium tin oxide and porous-TiO2layer of a dye-sensitised solar cell (DSSC). Effects of the arc- TiO2 thicknesses on the performance of the arc-TiO2-based DSSC were i...
Article
Full-text available
The iodine doped copper (I) iodide (I2: CuI) at different weight of iodine dopant have been prepared to investigate its thin films properties and photovoltaic performance. A novel method of mist atomization technique has been used for the deposition of CuI materials. The structural and electrical properties of CuI thin films deposited on the glass...
Article
Full-text available
Abstract. Effect of PEG on the TiO2 electrode morphology for scattering enhanced properties of the modified paste containing TiO2 sol-gel mixed with Degussa P-25 were investigated. The high surface area of the scattering centres in this study were formed by using nano size particles ascribed from TiO2 sol-gel while the sub-micron size particles wer...
Article
Abstract. In this work, a thermally stable multilayered transparent conducting oxide (TCO) utilizing TiO2 antireflection thin film (arc-TiO2) encapsulated under indium tin oxide (ITO) glass has been prepared by RF magnetron sputtering. The novel tri-functional conducting substrate with blocking layer capabilities has been designed via step-down int...
Conference Paper
In this work, the ZnO/TiO2 nanocomposite thin films were prepared by simultaneous Radio-Frequency Magnetron sputtering of ZnO and TiO2 targets on glass substrates at different deposition times in the range of 30-75 minutes that increases the film thickness. The electrical and surface morphology were characterized by I-V measurement and atomic force...
Article
Full-text available
A poly(methyl methacrylate)-doped titanium dioxide (PMMA:TiO2) nanocomposite film was obtained by spin coating the nanocomposite solution onto a silicon substrate. The nanocomposite solutions were prepared by dissolving the PMMA and TiO2 nanopowder in three different types of organic solvent, namely, toluene, tetrahydrofuran (THF), and acetone. We...
Conference Paper
Nb-doped TiO2 thin films have been successfully prepared using liquid phase solution method. For the first time, Nb-doped sol-gel has been combined with commercially available TiO2 nanopowder (Degussa P25) for preparing Nb-doped TiO2 photoanode for DSSC application. EDX analysis confirms the presence of Nb in the thin films. Nb-doped TiO2 sample sh...
Article
Aluminium (Al)-doped zinc oxide (ZnO) nanorod arrays were prepared on a seed-layer-coated glass substrate by a sonicated sol--gel immersion method. We have shown, for the first time, that the thickness of the nanorod arrays can be increased incrementally without greatly affecting the diameter of the nanorods, by increasing the number of immersions....
Conference Paper
ZnO thin films were deposited by Rf Magnetron sputtering on glass substrates at various deposition temperature in the range of 100-400°C. The thin films characterized using field emission scanning electron microscopy (FESEM), atomic force microscopy (AFM) and UV-VIS-NIR spectrophotometer for morphology and optical properties study. All the films ar...
Article
A poly(methyl methacrylate)-doped titanium dioxide (PMMA:TiO2) nanocomposite film was obtained by spin coating the nanocomposite solution onto a silicon substrate. The nanocomposite solutions were prepared by dissolving the PMMA and TiO2 nanopowder in three different types of organic solvent, namely, toluene, tetrahydrofuran (THF), and acetone. We...
Article
Sol-gel spin coated PMMA:TiO2 nanocomposite thin films on glass substrates were studied by comparing two types of the sol-gel solutions. Two types of PMMA:TiO2 nanocomposite sol-gel solutions were prepared; one using Degusa (P25), and the other one is using self-prepared TiO2 powder. The self-prepared nanosized TiO2 powder is obtained by drying the...
Article
Nanocry stalline anatase Ti02 photoanode have been prepared by mixing the commercial titania powder P-25 with a titanium alkoxide sol. The paste was further sonicated as to improve the mixing condition. It was then deposited on ITO-coated glass substrate having 10Q/sq by means of doctor blade technique. Two monolayer photoanodes with sonicated and...
Article
Poly (methy-methacrylate) (PMMA) thin films were deposited by sol-gel spin coating method on glass substrates. PMMA powder was dissolved in 60ml Toluene with the concentration of the PMMA in the solution was varied from 30 ~ 120 mg. Besides the PMMA concentration, we also studied the effect of the thin films thickness on the electrical properties....
Conference Paper
In this study, the effect of varying the corresponding thicknesses of p-type and n-type contact area of single junction silicon solar cells has been investigated. The simulation has been carried out using Silvaco TCAD. Several samples were created and the effects of each solar cell were analyzed. The result shows that thinner solar cell gives highe...
Article
This technical paper investigates the electrical analysis in sub 90 nm of PMOS. The investigation was carried out by using two different methods which is PMOS with strained silicon and Silicon-on-Insulator (SOI) technology. Strained silicon engineering has become a key innovation to enhance device on current. Recently, SOI technology has been widel...
Article
Process of developing the NMOS structure is performed in 2D SILVACO Athena and Atlas Simulation. The NMOS fabrication process steps were chosen from reference [4]. Mesh grid effect on net doping profile was obtained by varying the grid. Variation of grid was determined through observation between fine mesh and loosen mesh in y-axis. Simulation resu...
Article
This paper describes the fabrication and the performance analysis of 65 nm PMOS using Silicon-on-Insulator (SOI) technology. As the technology evolved towards minimizing the scaling size, the scaling activity has it own limitations. The Silicon-on-Insulator (SOI) is the primary method used to overcome the scaling limitation. In this paper, the 65 n...
Article
This project focuses on five different gate lengths; 0.35 mum, 0.25 mum, 0.18 mum, 0.13 mum and 0.09 mum. These gate lengths were determined by changing the etch location of polysilicon during the fabrication process of NMOS. The electrical characteristics that investigated were threshold voltage (Vth) and current maximum (Idmax). The investigation...

Questions

Questions (2)
Question
The multilayer system was TiO2 film deposited on industrial  ITO substrates. How can we measure weighted reflectance from reflectance measurement?
Question
I need to know how does porosity influence the refractive index of TiO2 thin film. Is it lower porosity (dense/compact) thin film will give higher refractive index, meanwhile higher porosity (non-compact) film produced lower refractive index?

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