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412 results on '"Fen, Yap Wing"'

28. Synthesis of bioactive glass-ceramics: Effect of the incubation duration on mechanical properties using PBS solution

Author

Zhi Wei Loh, Zhi Wei Loh, Mohd Zaid, Mohd Hafiz, Awang Kechik, Mohd Mustafa, Yap Wing Fen, Yap Wing Fen, Wei Mun Cheong, Wei Mun Cheong, Mayzan, Mohd Zul Hilmi, Zhi Wei Loh, Zhi Wei Loh, Mohd Zaid, Mohd Hafiz, Awang Kechik, Mohd Mustafa, Yap Wing Fen, Yap Wing Fen, Wei Mun Cheong, Wei Mun Cheong, and Mayzan, Mohd Zul Hilmi

Abstract

Owing to its wear resistance and mechanical performance, glass-ceramics are often favoured in dental applications. However, prolonged immersion can cause material degradation and reduced strength. Typically, adding fluoride is believed to improve their properties. Hence, this work prepared fluoride-free and fluoride glassceramics via the melt-quenching technique. The samples were assessed after soaking PBS solution for 14 days. The fluoride sample exhibited a higher hardness of HV = 653 ± 2.80 and toughness of 3.37 ± 0.01 MPa⋅m1/2. This experimental results were compared to the human dentine (HV = 61.2), human enamel (HV = 510) and commercial dental glass-ceramics (HV = 408–663). The fluoride samples showed higher bioactivity, evident from the crystal formation in micrographs. Therefore, the prepared samples exhibit a promising potential as new materials for dental crown applications.

Published
2024

29. Investigating the potential of cobalt-doped zinc oxide (Zn1-xCoxOδ) as a buffer layer for CZTS thin-film solar cells.

Author

Abdullah, Huda, Xian, Kang Jian, Hamzah, Muhammad Nurhayat Amir, Naim, Norshafadzila Mohammad, Bais, Badariah, Mohmad, Abdul Rahman, Sampe, Jahariah, Yuliarto, Brian, Othman, Mohd Hafiz Dzarfan, Fen, Yap Wing, and Septiani, Ni Luh Wulan

Abstract

Copper zinc tin sulfide (CZTS) solar cells are one of the most promising possible substitutes for chalcopyrite copper indium gallium selenide (CIGS) in the future photovoltaic industry. This work reports on the preparation and characterization of a cobalt-doped zinc oxide (Zn1-xCoxOδ) thin-film buffer layer using the spin-coating technique on ITO back contact glass substrates. The effect of cobalt-doped zinc oxide on the structural, optical, morphological, and electrical properties of the obtained films has been investigated. The prepared thin-films were analyzed by several different characterization techniques such as X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), ultraviolet–visible (UV–Vis) spectroscopy and current density–voltage. (J-V) measurements. XRD analysis indicates all Zn1-xCoxOδ buffer layer films possess the wurtzite hexagonal polycrystalline structure with orientation (0 0 2). The images from FESEM analysis indicate the cross-sectional area and internal structure of Zn1-xCoxOδ buffer layer. The UV–Vis optical band gaps of the films were found to be in the range of 3.53–3.97 eV. The electrical analysis shows that the conductivity of cobalt-doped ZnO increases compared to the pure ZnO film without doping. The highest power conversion efficiency (PCE) of Zn0.91Co0.09Oδ is 0.54%. The analysis on cobalt-doped ZnO film showed that cobalt and zinc oxide are good candidates and potential for optoelectronic applications such as the production of solar cells which involved transparent electrodes. [ABSTRACT FROM AUTHOR]

Published
2024
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46. Optimizing Photovoltaic Performance in CZTS-Based Zn(1−x)SnxO (x = 0.100, 0.133, 0.167, 0.200 and 0.233) Thin Film Solar Cells: A Structural, Morphological and Optical Study.

Author

Xian, Kang Jian, Abdullah, Huda, Naim, Norshafadzila Mohammad, Yuliarto, Brian, Yahya, Iskandar, Atiqi, Muhammad Ammirrul, Othman, Mohd Hafiz Dzarfan, Akhtaruzzaman, Md., Sopian, Kamaruzzaman, Fen, Yap Wing, and Ahmad, Md. Fauzi

Subjects
SOLAR cells, THIN films, ZINC tin oxide, PHOTOVOLTAIC power systems, CADMIUM sulfide, BUFFER layers
Abstract

Recently, the trend in solar cell research has become highly competitive, with researchers striving to find the best material that strikes a balance between various factors, including fabrication speed, cost, material toxicity, abundance, and overall photovoltaic performance. Typically, cadmium sulfide serves as the buffer layer in CZTS solar cells, but this material is known for its high toxicity. On the other hand, zinc tin oxide (ZTO) has gained popularity in solar cell applications due to its transparency, conductivity, thermal stability, and non-toxic nature. Consequently, the idea of using ZTO as an alternative buffer layer in CZTS solar cells has emerged. In this study, we synthesized nanocomposite thin films of Zn(1−x)SnxO (x = 0.100, 0.133, 0.167, 0.200, and 0.233% w/w) using the sol–gel method and spin coating technique. Among the various concentrations tested, the thin film composed of Zn0.833Sn0.167O demonstrated the highest power conversion efficiency (PCE) of 0.54%. This outcome marked a successful result, indicating that this particular composition optimizes efficiency in our study. It is noteworthy that excessive tin doping did not lead to improved efficiency. However, it is important to acknowledge that the PCE in our experiment is relatively low compared to that of other researchers due to the use of ITO glass as the back contact, chosen for economic considerations. Furthermore, our fabrication method for ZTO thin films resulted in a bandgap energy (Eg) value of 0.78 eV. In summary, our findings suggest that ZTO has the potential to replace cadmium sulfide as the buffer layer in CZTS-based solar cells. These findings are expected to have a significant impact on promoting ZTO as the primary buffer material in CZTS solar cell technology. [ABSTRACT FROM AUTHOR]

Published
2024
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47. Influence of Eu3+ Ions on Elastic Moduli and Microhardness of Zinc-boro-soda-lime-silica Glass System.

Author

Cheong, Wei Mun, Mohd Zaid, Mohd Hafiz, Matori, Khamirul Amin, Fen, Yap Wing, Tee, Tan Sin, Loh, Zhi Wei, Mayzan, Mohd Zul Hilmi, and Schmid, Siegbert

Abstract

This study focuses on zinc-boro-soda-lime-silica (ZnO − B2O3 − SLS) glasses produced through fast-cooling melt-quenching. The influence of Eu3+ ions on glass properties is explored. As Eu3+ concentration rises, bulk density and molar volume increase from 3.423 to 3.484 g/cm3 and 21.760 to 23.768 cm3/mol, respectively. X-ray diffraction indicates amorphous phase dominance supported by glassy surface morphology. Ultrasonic measurements show the increasing and decreasing trend for ultrasonic velocities and elastic moduli with increasing Eu3+ concentration. Poisson's ratio of the samples signifies their low cross-link density behavior. Moreover, the ZBS-3Eu presents the highest microhardness value of 4.776 GPa. The sample's fractal bond connectivity varies from 1.814 to 2.051, suggesting a 2D structure. Likewise, the ZBS-3Eu glass sample exhibits the most rigidity attributed to its highest fg value of 0.075. These findings suggest that ZBS-3Eu has the potential for applications requiring high-strength glass. [ABSTRACT FROM AUTHOR]

Published
2024
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48. Optimizing Photovoltaic Performance in CZTS-Based Zn(1−x)SnxO (x = 0.100, 0.133, 0.167, 0.200 and 0.233) Thin Film Solar Cells: A Structural, Morphological and Optical Study

Author

Xian, Kang Jian, primary, Abdullah, Huda, additional, Naim, Norshafadzila Mohammad, additional, Yuliarto, Brian, additional, Yahya, Iskandar, additional, Atiqi, Muhammad Ammirrul, additional, Othman, Mohd Hafiz Dzarfan, additional, Akhtaruzzaman, Md., additional, Sopian, Kamaruzzaman, additional, Fen, Yap Wing, additional, and Ahmad, Md. Fauzi, additional

Published
2023
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