Norhayati Sabani
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Preferred name
Norhayati Sabani
Official Name
Norhayati, Sabani
Alternative Name
Sabani, N.
Sabani, Norhayati
Sabani, Norhayati Bt
Norhayati, S.
Sabani, Norhayati Binti
Main Affiliation
Scopus Author ID
54785178400
Researcher ID
AAB-8243-2022

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  • Publication
    Optimization of MEH-PPV based single and double-layer TOLED structure by numerical simulation
    ( 2021-12)
    T. Kersenan
    ;
    Nor Farhani Zakaria
    ;
    Safizan Shaari
    ;
    Norhayati Sabani
    ;
    Nurjuliana Juhari
    ;
    Meor Ahmad Faris bin Meor Ahmad Tajudin
    ;
    A.F.A Rahim
    In this work, we simulated and characterized Poly [2-methoxy-5-(2’-ethylhexyloxy)-1, 4-phenylene vinylene] (MEH-PPV) based single and double-layer TOLED by using Silvaco ATLAS device simulator to achieve prominent values of electrical and optical properties of the device. MEH-PPV were used as the emitting layer (EML) in the single-layer, while addition of Poly [(3,4-ethylene dioxythiophene)-poly(styrene sulfonate)] (PEDOT-PSS) as the electron transport layer (ETL) were conducted in double-layer TOLED simulation. The EML and ETL thickness in both structures were varied between 10 – 150 nm, respectively, to observe and understand the underlying physics of the relation in the layer thickness to the electrical and optical characteristics. Furthermore, variation of the EML/ETL thickness ratio from 1:1 to 5:1 (with thickness in between 10 to 50 nm) had also been conducted. From this work, it is understood that the thickness of the EML layer plays the most important role in TOLED, and by balancing the carrier injections and recombination rate in appropriate EML/ETL thickness ratio, the electrical and optical properties can be improved. By optimizing the EML/ETL thickness and thickness ratio, an optimal forward current of 1.41 mA and luminescent power of 1.93e-18 W/μm has been achieved with both MEH-PPV and PEDOT-PSS layer thickness of 10 nm (1:1 ratio), respectively. The results from this work will assist the improvement of TOLED device to be implemented widely in low power and transparent electronic appliances.
  • Publication
    A study on electrical performance of SiC-based self-switching diode (SSD) as a high voltage high power device
    ( 2023-12)
    N. Z. A. A. Sha’ari
    ;
    Nor Farhani Zakaria
    ;
    Shahrir Rizal Kasjoo
    ;
    Mohd Natashah Norizan
    ;
    Ili Salwani Mohamad
    ;
    Mohd Fairus Ahmad
    ;
    Shamsul Amir Abdul Rais
    ;
    Banu Poobalan
    ;
    Norhayati Sabani
    ;
    A. F. A. Rahim
    The Self-switching Diodes (SSDs) have been primarily researched and used in low-power device applications for RF detection and harvesting applications. In this paper, we explore the potential of SSDs in high-voltage applications with the usage of Silicon Carbide (SiC) as substrate materials which offers improved efficiency and reduced energy consumption. Optimization in terms of the variation in the interface charges, metal work function, and doping concentration values has been performed by means of a 2D TCAD device simulator. The results showed that the SSD can block up to 600 V of voltage with an optimum interface charge value of 1013 cm-2, making them suitable for higher voltage applications. Furthermore, it also found that the work function of the metal contact affected the forward voltage value, impacting the current flow in the device. Variation in doping concentrations also resulted in higher breakdown voltages and significantly increased forward current, leading to an increased power rating of 27 kW. In conclusion, the usage of 4H-SiC-based SSDs shows a usable potential for high-voltage applications with optimized parameters. The results from this research can facilitate the implementation of SSD in the development of high-power semiconductor devices for various industrial applications.
      36  15
  • Publication
    Synergistic impact of magnesium compound as a potential dye additive for organic-based sensitizer in DSSCs
    (Elsevier, 2023)
    A.A. Khan
    ;
    Mohd Hanapiah Abdullah
    ;
    Mohamad Faizal Abd. Rahman
    ;
    Syarifah Adilah Mohamed Yusoff
    ;
    Mohamad Hafiz Mamat
    ;
    Afaf Rozan Mohd Radzol
    ;
    Nor Diyana Md Sin
    ;
    Norhayati Sabani
    ;
    Itreesh Basha Shameem Banu
    ;
    Mahmood Mahmood Mohamad Rusop
    This study investigates the MgSO4 salt compound as the dye additive for dye treatment in dye-sensitized solar cells (DSSCs). The properties of the chlorophyll-based dye molecule sensitizer extracted from Mitragyna speciosa (MS) under the treatment of MgSO4 additive that contributed to the highest power conversion efficiency, PCE were examined. Field emission scanning electron micrograph, FESEM, X-ray diffraction, XRD, Fourier transform-IR, FTIR, UV-Vis spectroscopy, current to voltage characteristics, I-V and incidence photon to current efficiency, IPCE were used to investigate the structural, optical, chemical and also the electrical properties of the DSSC cells and their components. It was discovered that the extracted MS dye contained chlorophyll pigment, a powerful light-harvesting pigment required for the production of charge transfer and electricity. The MgSO4-treated dye provides stable pH conditions, faster electron injection due to higher band energy, Eg position, higher dye molecules adsorption, and reduced back recombination of electrons in the fabricated DSSC. As a result, all of the treated MgSO4 dye cell DSSCs outperformed the untreated dye cell, and at their optimal dye additive of 0.3 g (3-TM), the DSSC's current density, JSC, and associated PCE were higher at 2.08 mA/cm2 and 0.39%, respectively. Thus, using MS as a dye sensitizer in conjunction with an optimized MgSO4 compound as an additive resulted in improved photovoltaic effects, increased solar light absorption, and improved photon energy utilization.
      7  1
  • Publication
    Progression in the growth of cylindric nanostructures: carbon nanotubes (CNTs) and carbon nanofibers (CNFs) on graphene
    ( 2022-12)
    Syarifah Norfaezah Sabki
    ;
    Norzilah Abdul Halif
    ;
    H.A. Hanafi
    ;
    Mishthafiyatillah
    ;
    Muhammad Asri Idris
    ;
    Norashiken Othman
    ;
    Mohamad Nazri Abdul Halif
    ;
    Norhayati Sabani
    ;
    A.F. Abd Rahim
    The combination of carbon nanotubes (CNTs) and graphene produce a CNTs-graphene hybrid material with excellent electrical and mechanical properties that improved from their single form. This CNTs-graphene hybrid material has the potential to be used as electrodes and interconnects as it has better properties compared to copper (Cu). This work intended to grow CNTs on graphene using a CVD technique. The growth process used graphene on a Cu substrate with ferrocene as the catalyst, acetone as the carbon precursor and reactor temperature of 800oC. However, the process has unintentionally grown carbon nanofibers (CNFs). To observe the progression in the growth of CNTs and CNFs on graphene, the effect of growth reaction time is crucial. Hence, this work investigates the growth progression of the CNTs and CNFs on graphene based on different reaction times of 10 min, 20 min, 30 min and 60 min. It was found that the agglomeration of carbon is incomplete at 10 min reaction time and produced cylindric nanostructures. A further reaction time of 20 min and 30 min has significantly changed the size of the cylindric nanostructures into CNTs and CNFs with a very slight difference in the size, density, and coverage. The 30 min reaction time produced denser CNTs and CNFs with more uniform size and coverages. A longer reaction time of 60 min led to very long CNFs with an average length of 120 μm. In conclusion, meticulous fine-tuning of the reaction time is required to control the formation of CNTs and CNFs on graphene.
      2  36
  • Publication
    Synergistic effect of agarose biopolymer gel electrolyte with modified TiO2 for low-cost electrochemical device applications
    ( 2023)
    Afzalina Badri
    ;
    Mohd Fairul Sharin Abdul Razak
    ;
    Wan Izhan Nawawi
    ;
    Amira Abul Shukor
    ;
    Mohd Natashah Norizan
    ;
    Norhayati Sabani
    The effect of different concentrations of agarose gel electrolyte in a low-cost fabrication of DSSC system was investigated. The modified DSSC was fabricated by a sandwiched method using ITO glass plates as substrates. TiO2-Graphene-coated glass plate was used as the working electrode while PANI-GO-coated glass plate works as a counter electrode, respectively. Both electrodes were separated by agarose gel mixture with KI solution as gel biopolymer electrolyte. The FTIR result showed that peaks of agarose are well observed in the KI-agarose spectra. In the XRD analysis, the combination of KI-agarose has reduced the crystallinity of agarose which was good for ionic conductivity value. The addition of agarose in KI solution also produced a fine channel to facilitate the ionic transfer in electrolyte. The behaviour of electrochemical properties of the system was observed using AC impedance spectroscopy based on the Nyquist plot. From the plot, three semicircles were observed as the responses at different frequencies. It was observed that the 5 wt% agarose electrolyte in DSSC system was selected as the optimum loading exhibiting the lowest resistivity ensuring the faster electron transfer and giving the ionic conductivity of 9.04 × 10−1 S/cm. The ionic conductivity of the system was dropped at 2.21 × 10−1 S/cm as the percentage of agarose was increase to 6 wt%.
      2  20