Fijay Fauzi
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Preferred name
Fijay Fauzi
Official Name
Fijay, Fauzi
Alternative Name
Fauzi, Fijay
Fauzi, F.
Main Affiliation
Scopus Author ID
57205381448
Researcher ID
GEB-0683-2022

Research Output
Now showing 1 - 3 of 3
  • Publication
    The effect of heat treatment on Bismuth Oxyiodide thin films for lead-free Perovskite solar cells
    (Springer, 2023)
    Nor Azlian Abdul Manaf
    ;
    Asyraf Hakimi Azmi
    ;
    Azuraida Amat
    ;
    Wan Yusmawati Wan Yusoff
    ;
    Salmiah Ibrahim
    ;
    Fijay Fauzi
    Lead-free bismuth oxyiodide (BiOI) perovskite solar cells (PSCs) have been successfully fabricated using successive ionic layer adsorption and reaction technique. The effect of heat treatment temperature on thickness, conductivity and microstructure of BiOI thin films has been studied prior to the device fabrication. The BiOI film morphology formed flake agglomeration like flower platelets for as deposited BiOI film. However, the agglomeration and the flakes were shattered when the BiOI was annealed above 450°C. This is associated with the trend in conductivity measurement where BiOI achieved the optimum conductivity when it was heat treated at 350°C and reduced as the heat treatment exceeded 450°C. This could be due to the reduction of grain boundaries because of development of the flake sizes during the heat treatment, material sublimation and particle aggregations that developed higher resistance in the BiOI layers. The device performance under optimum heat treatment has been characterized using I–V measurement under a solar spectrum simulator with AM 1.5 illuminations. BiOI PSCs treated at 350°C showed ~ 6% efficiency. This study provided better understanding on BiOI thin film behaviors under several heat treatments, and it has potential to be applied as lead-free PSCs.
  • Publication
    Dual Outputs Switch Mode Power Supply (DOSMPS) utilizing forward converter topology
    (IOP Publishing, 2023)
    Fijay Fauzi
    ;
    Uson Udom
    ;
    Muhammad Eismat Zaidi
    ;
    Nor Azlian Abdul-Manaf
    Experimental works of dual, 5 volt DC outputs switch mode power supply (DOSMPS) is presented in this paper. To design, construct and evaluate the DOSMPS using forward converter topology are the objectives of this article. In this work, a 556 timer was picked as the pulse width modulator. The 556 timer was picked because it is widely used, cheap and capable of producing stable dual pulse width modulations. Since, this work targeted dual DC outputs, two forward converter circuits were built. However, switching frequencies at two transistors were controlled by only one 556 timer. The complete circuit of the DOSMPS consist of full bridge rectifier, smoothing capacitor, two high frequency transformers and two forward converter circuits. At the first stage of this work, the DOSMPS circuit was designed using Proteus software. Later, the complete DOSMPS circuit was constructed on two breadbroads after all of the electronic components and devices were available. Important parameters such as the input and output voltages and duty cycles were measured using digital oscilloscope and multimeter. Results from these measurements have shown that the designed circuit can convert single-phase 24 Vrms 50 Hz AC voltage input into dual and stable 5±0.1 V DC outputs. Also from this work, it was observed that, pulsed DC voltages with peak value of 2 V and frequency less than 20 kHz are sufficient in controlling the switching frequencies of both BJT transistors. This allows the regulation of the output voltage within the desired range. Analysis carried out after the measurements has shown close correlation between the theoretical and experimental results, where the calculated and measured switching frequencies had only deviated by 1.1%.
  • Publication
    Design of 30 kW three-phase string inverter using simulink
    (IOP Publishing, 2020)
    Fijay Fauzi
    ;
    N Yasin
    ;
    Leong Jenn Hwai , Jenn
    ;
    Baharuddin Ismail
    This paper presents the design and simulation of a 30 kW DC to AC inverter. The inverter is designed based on the Zeverlution Pro 33K three-phase DC to AC inverter. Currently, there are 6 units of the inverters installed at 180 kW solar power plant located at Mukim Utan Aji, Perlis. So, in this paper, the results from the computer simulation will be compared to the site measurement conducted from this power plant. In this design, pulse with modulation (PWM) is used as the switching technique. Even though PWM offers the ease of LC filter design and low Total Harmonic Distortion (THD), the voltage amplitude of the sine wave output fails to achieve the required national grid parameters, i.e. 240 Vrms. To overcome this problem, a three-phase transformer has to be incorporated in the design to obtain the desired outputs. Results from computer simulation using SIMULINK show that the targeted AC parameters for all phases were achieved after comparing with the site measurement.
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