Ili Salwani Mohamad
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Preferred name
Ili Salwani Mohamad
Official Name
Mohamad, Ili Salwani
Alternative Name
Salwani, Iii
Salwani Mohamad, Ili
Mohamad, I. S.B.
Mohamad, I. S.
Smohamad, I.
Ili, Salwani Mohamad
Bintimohamad, Ilisalwani
Main Affiliation
Scopus Author ID
55898400600
Researcher ID
ABS-3594-2022

Research Output

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  • Publication
    Charge recombination in zinc oxide-based dye-sensitized solar cell: a mini review
    ( 2021-12)
    Kaiswariah Magiswaran
    ;
    Mohd Natashah Norizan
    ;
    Ili Salwani Mohamad
    ;
    Norsuria Mahmed
    ;
    Siti Norhafizah Idris
    ;
    Sharizal Ahmad Sobri
    Dye-sensitized solar cell (DSSC) has been studied widely due to its efficiency and the simplicity of manufacturing technology. Much research has been performed to improve the photovoltaic output parameters in DSSC by modifying the photoanode layers. The efforts to investigate DSSC mainly focus on how to increase light absorption, speed electron transport in circuits, and reduce charge recombination. This review discusses the process of charge recombination and the paths of occurrence in a DSSC. Recombination occurs when the electrons in the conduction band fall into the valance band holes and is considered an unnecessary process in DSSC. Due to the recombination process, the photocurrent and the photovoltage are reduced, leading to lower power conversion efficiency. Hence, the ways to overcome the charge recombination process were also discussed.
  • Publication
    Synthesis methods of tin oxide as photoanode for dye-sensitized solar cell performance- a short review
    ( 2021-12)
    Siti Norhafizah Idris
    ;
    Mohd Natashah Norizan
    ;
    Ili Salwani Mohamad
    ;
    Norsuria Mahmed
    ;
    Kaiswariah Magiswaran
    ;
    Sharizal Ahmad Sobri
    This review focused on the synthesis methods of tin oxide (SnO₂) nanoparticles as a photoanode for dye-sensitized solar cell (DSSC) and how it impacts the performance. There are many different techniques and various nanoparticles were produced and usually characterized by X-ray diffraction (XRD) to determine crystalline structure of SnO₂, scanning electron microscopy (SEM) to examine the surface morphology and size details and J-V solar simulator to verify current-voltage characteristics. In summary, considering all the methods reviewed, sol-gel is reported as the best method to produce SnO₂ nanoparticles for DSSC fabrication with the highest efficiency recorded of 3.96%.
  • Publication
    The effect of ZnO photoanode solution ageing to the performance of dye-sensitized solar cell (DSSC)
    ( 2020-01-08)
    Gan Y.K.
    ;
    Nor Farhani Zakaria
    ;
    Ili Salwani Mohamad
    ;
    Mohd Natashah Norizan
    This paper reports the effect of ageing of the zinc oxide (ZnO) solution made of diethanolamine (DEA) and ZnO powder mixture to the performance of DSSCs. The ZnO solution was prepared on day 0 and kept in ambient room temperature for ageing analysis. Two DSSCs were prepared by depositing the ZnO solution on an indium-doped tin oxide (ITO) glass respectively by using doctor-blade technique in a light controlled (dark) surrounding on daily basis for efficiency analysis. Investigation on the nanostructures of the photoanodes was made by varying the ageing days of the ZnO solution between day 0 to 28. The resulting average nanoparticle sizes were in the range of 0.113 μm to 0.960 μm in nanorods shape, which suggests that the solution is homogenous and utilisable throughout 28 days of storage. Efficiency values ranging from 0.95% to 2.05% had been observed on the first hour of the DSSCs made from various aged solution up to 28 days, which proved that 28 days of ageing of ZnO photoanode solution does not affect the performance of DSSCs. The results obtained may assist in the fabrication process and storage of DSSC components in the future.
      1  24
  • Publication
    Synthesis Methods of Tin Oxide as Photoanode for Dye-Sensitized Solar Cell Performance: A Short Review
    ( 2021-12-01)
    Idris S.N.
    ;
    Mohd Natashah Norizan
    ;
    Ili Salwani Mohamad
    ;
    Norsuria Mahmed
    ;
    Magiswaran K.
    ;
    Sobri S.A.
    This review focused on the synthesis methods of tin oxide (SnO2) nanoparticles as a photoanode for dye-sensitized solar cell (DSSC) and how it impacts the performance. There are many different techniques and various nanoparticles were produced and usually characterized by X-ray diffraction (XRD) to determine crystalline structure of SnO2, scanning electron microscopy (SEM) to examine the surface morphology and size details and J-V solar simulator to verify current-voltage characteristics. In summary, considering all the methods reviewed, sol-gel is reported as the best method to produce SnO2 nanoparticles for DSSC fabrication with the highest efficiency recorded of 3.96%.
      35  4
  • Publication
      1  24
  • Publication
    Controlling the Layer Thickness of Zinc Oxide Photoanode and the Dye-Soaking Time for an Optimal-Efficiency Dye-Sensitized Solar Cell
    ( 2023-01-01)
    Magiswaran K.
    ;
    Mohd Natashah Norizan
    ;
    Norsuria Mahmed
    ;
    Ili Salwani Mohamad
    ;
    Idris S.N.
    ;
    Sabri M.F.M.
    ;
    Amin N.
    ;
    Sandu A.V.
    ;
    Vizureanu P.
    ;
    Nabiałek M.
    ;
    Mohd Arif Anuar Mohd Salleh
    Dye-sensitized solar cells (DSSCs) were developed by exploiting the photovoltaic effect to convert solar energy into electrical energy. The photoanode layer thickness significantly affects the semiconductor film’s ability to carry electronic charges, adsorb sensitizing dye molecules, and lower the recombination of photo-excited electrons injected into the semiconductor. This study investigated the dependence of the zinc oxide (ZnO) photoanode thin-film thickness and the film soaking time in N719 dye on the photocurrent–voltage characteristics. The ZnO photoanode was applied to glass using the doctor blade method. The thickness was varied by changing the scotch tape layers. The ZnO-based DSSC attained an efficiency of 2.77% with three-layered photoanodes soaked in the dye for three hours, compared to a maximum efficiency of 0.68% that was achieved with three cycles using the dip-coating method in other research. The layer thickness of the ZnO photoanode and its optimal adsorption time for the dye are important parameters that determine the efficiency of the DSSC. Therefore, this work provides important insights to further improve the performance of DSSCs.
      1
  • Publication
    Near-Infrared (NIR) Silver Sulfide (Ag2S) semiconductor photocatalyst film for degradation of methylene blue solution
    ( 2023)
    Zahrah Ramadlan Mubarokah
    ;
    Norsuria Mahmed
    ;
    Mohd Natashah Norizan
    ;
    Ili Salwani Mohamad
    ;
    Mohd. Mustafa Al Bakri Abdullah
    ;
    Katarzyna Błoch
    ;
    Marcin Nabiałek
    ;
    Madalina Simona Baltatu
    ;
    Andrei Victor Sandu
    ;
    Petrica Vizureanu
    A silver sulfide (Ag2S) semiconductor photocatalyst film has been successfully synthesized using a solution casting method. To produce the photocatalyst films, two types of Ag2S powder were used: a commercialized and synthesized powder. For the commercialized powder (CF/comAg2S), the Ag2S underwent a rarefaction process to reduce its crystallite size from 52 nm to 10 nm, followed by incorporation into microcrystalline cellulose using a solution casting method under the presence of an alkaline/urea solution. A similar process was applied to the synthesized Ag2S powder (CF/syntAg2S), resulting from the co-precipitation process of silver nitrate (AgNO3) and thiourea. The prepared photocatalyst films and their photocatalytic efficiency were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and UV-visible spectroscopy (UV-Vis). The results showed that the incorporation of the Ag2S powder into the cellulose films could reduce the peak intensity of the oxygen-containing functional group, which indicated the formation of a composite film. The study of the crystal structure confirmed that all of the as-prepared samples featured a monoclinic acanthite Ag2S structure with space group P21/C. It was found that the degradation rate of the methylene blue dye reached 100% within 2 h under sunlight exposure when using CF/comAg2S and 98.6% for the CF/syntAg2S photocatalyst film, and only 48.1% for the bare Ag2S powder. For the non-exposure sunlight samples, the degradation rate of only 33–35% indicated the importance of the semiconductor near-infrared (NIR) Ag2S photocatalyst used.
      18  1
  • Publication
    Asas Peranti dan Pengujian Litar Elektronik
    (Penerbit UniMAP, 2016)
    Sohiful Anuar Zainol Murad
    ;
    Mohd Nazrin Md Isa
    ;
    Ili Salwani Mohamad
    ;
    Mohd Natashah Norizan
    Buku ini membincangkan asas-asas peranti elektronik dan perkara-perkara yang berkaitan dengan uji kaji litar elektronik. Sebelum pengukuran litar dijalankan, ciri-ciri peranti perlu difahami dan persediaan untuk menjalankan uji kaji boleh dimulakan. Apabila sesuatu uji kaji hendak dijalankan, litar elektronik perlu dibina di atas papan litar dan semua peralatan pengukuran perlu ditentukurkan. Kabel-kabel akan disambung di antara peralatan tadi dengan litar di atas papan reka untuk pengukuran. Tajuk-tajuk yang dibincangkan dalam buku ini disusun dan diolah dengan cara yang mudah berserta gambar rajah yang berkaitan. Isi kandungannya pula adalah ringkas dengan bahasa yang mudah difahami. Buku ini boleh dijadikan rujukan kepada pelajar yang mempelajari subjek elektronik dan uji kaji litar elektronik. Juga sesuai dijadikan panduan pengajaran dan pembelajaran kepada para pensyarah. Isi kandungannya menitikberatkan pengujian litar elektronik secara praktikal dan dapat membantu pelajar mengendalikan uji kaji di dalam subjek-subjek seperti peranti elektronik dan analog elektronik dengan lebih baik.
      13  1
  • Publication
    A Study on Electrical Performance of SiC-based Self-switching Diode (SSD) as a High Voltage High Power Device
    ( 2023-12-01)
    Sha’ari N.Z.A.A.
    ;
    Nor Farhani Zakaria
    ;
    Shahrir Rizal Kasjoo
    ;
    Ahmad M.F.
    ;
    Mohd Natashah Norizan
    ;
    Ili Salwani Mohamad
    ;
    Mohd Fairus Ahmad
    ;
    Shamsul Amir Abdul Rais
    ;
    Banu Poobalan
    ;
    Norhayati Sabani
    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.
      5  50
  • Publication
    Near-Infrared (NIR) Silver Sulfide (Ag₂S) Semiconductor Photocatalyst Film for Degradation of Methylene Blue Solution
    ( 2023-01-01)
    Mubarokah Z.R.
    ;
    Norsuria Mahmed
    ;
    Mohd Natashah Norizan
    ;
    Ili Salwani Mohamad
    ;
    Mohd. Mustafa Al Bakri Abdullah
    ;
    Błoch K.
    ;
    Nabiałek M.
    ;
    Baltatu M.S.
    ;
    Sandu A.V.
    ;
    Vizureanu P.
    A silver sulfide (Ag2S) semiconductor photocatalyst film has been successfully synthesized using a solution casting method. To produce the photocatalyst films, two types of Ag2S powder were used: a commercialized and synthesized powder. For the commercialized powder (CF/comAg2S), the Ag2S underwent a rarefaction process to reduce its crystallite size from 52 nm to 10 nm, followed by incorporation into microcrystalline cellulose using a solution casting method under the presence of an alkaline/urea solution. A similar process was applied to the synthesized Ag2S powder (CF/syntAg2S), resulting from the co-precipitation process of silver nitrate (AgNO3) and thiourea. The prepared photocatalyst films and their photocatalytic efficiency were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and UV-visible spectroscopy (UV-Vis). The results showed that the incorporation of the Ag2S powder into the cellulose films could reduce the peak intensity of the oxygen-containing functional group, which indicated the formation of a composite film. The study of the crystal structure confirmed that all of the as-prepared samples featured a monoclinic acanthite Ag2S structure with space group P21/C. It was found that the degradation rate of the methylene blue dye reached 100% within 2 h under sunlight exposure when using CF/comAg2S and 98.6% for the CF/syntAg2S photocatalyst film, and only 48.1% for the bare Ag2S powder. For the non-exposure sunlight samples, the degradation rate of only 33–35% indicated the importance of the semiconductor near-infrared (NIR) Ag2S photocatalyst used.
      2