The Experts below are selected from a list of 8517 Experts worldwide ranked by ideXlab platform
Pa Feng - One of the best experts on this subject based on the ideXlab platform.
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Novel Ag-doped glass Frits for high-efficiency crystalline silicon solar cells
CHEMICAL COMMUNICATIONS, 2017Co-Authors: Yua Sheng, Che Yongji, Mei Zongwei, Zhang Ming-jia, Gao Zhou, Wang Xingbo, Jiang Xing, Pa FengAbstract:Glass Frits play an important role in the front contact electrodes of crystalline silicon (c-Si) solar cells. In this work, we developed a novel glass Frit by doping Ag into a glass Frit in the process of hightemperature synthesis. When the Ag paste including this novel glass Frit was used as the front contact electrode of silicon solar cells, the conversion efficiency of poly-crystalline silicon (pc-Si) solar cells was improved by 1.9% compared to the glass Frit without Ag. Through SEM characterisation and calculation of series resistance, we further found that the interface between Ag and Si was improved and the contact resistance of Ag and Si was greatly reduced, which were believed to be responsible for the improvement of solar cell performance. This work shows great guidance significance to develop novel and highly efficient commercial glass Frits applied in solar cells in the future.Guangdong Innovative and Intrepreneurial Research Team Program [2013N080]; Peacock Plan [KYPT20141016105435850]; Shenzhen Key Lab [(2012)780, ZDSY20130331145131323]SCI(E)ARTICLE466239-62425
Atsushi Ogura - One of the best experts on this subject based on the ideXlab platform.
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characterization of glass Frit in conductive paste for n type crystalline silicon solar cells
IEEE Journal of Photovoltaics, 2017Co-Authors: Takayuki Aoyama, Mari Aoki, Isao Sumita, Yasushi Yoshino, Atsushi OguraAbstract:Contacting silver paste for an emitter of silicon solar cells has been pointed out to create shunting and to increase carrier recombination due to silver-crystallites at the emitter. However, since these observed electrical losses come of not only the crystallites but also multiple effects of constituents in the paste, whether the crystallites mainly cause these losses has still remained unknown. In this study, how glass Frit “itself,” which is most important constituent in the paste, affects the electrical losses is investigated by applying the “floating contact method.” Furthermore, the contact interface between the Frit and silicon surface is also investigated to elucidate the mechanism of the losses. The metal oxide glass Frit itself is found to drastically cause the shunting and the recombination in n-type solar cells, resulting in loss in open-circuit voltage, and creates metal lead crystallites through redox reaction at silicon surface during firing. The shunting originates from the metallic lead, and the recombination is induced by diffused impurities or defects into the silicon emitter through the reaction. The electrical losses in the solar cells are led to not only by the silver-crystallites, but also by the glass Frit itself.
Yua Sheng - One of the best experts on this subject based on the ideXlab platform.
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Novel Ag-doped glass Frits for high-efficiency crystalline silicon solar cells
CHEMICAL COMMUNICATIONS, 2017Co-Authors: Yua Sheng, Che Yongji, Mei Zongwei, Zhang Ming-jia, Gao Zhou, Wang Xingbo, Jiang Xing, Pa FengAbstract:Glass Frits play an important role in the front contact electrodes of crystalline silicon (c-Si) solar cells. In this work, we developed a novel glass Frit by doping Ag into a glass Frit in the process of hightemperature synthesis. When the Ag paste including this novel glass Frit was used as the front contact electrode of silicon solar cells, the conversion efficiency of poly-crystalline silicon (pc-Si) solar cells was improved by 1.9% compared to the glass Frit without Ag. Through SEM characterisation and calculation of series resistance, we further found that the interface between Ag and Si was improved and the contact resistance of Ag and Si was greatly reduced, which were believed to be responsible for the improvement of solar cell performance. This work shows great guidance significance to develop novel and highly efficient commercial glass Frits applied in solar cells in the future.Guangdong Innovative and Intrepreneurial Research Team Program [2013N080]; Peacock Plan [KYPT20141016105435850]; Shenzhen Key Lab [(2012)780, ZDSY20130331145131323]SCI(E)ARTICLE466239-62425
Hui Wang - One of the best experts on this subject based on the ideXlab platform.
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effect of glass Frit in ag paste on the electrical properties of front side ag contacts for crystalline silicon solar cells
RSC Advances, 2015Co-Authors: Yuping Tai, Guoju Zheng, Hanying Wang, Hui WangAbstract:The effect of glass Frit, used in front-side silver pastes, on the electrical properties of front-side silver contacts in silicon solar cells was studied. Glass Frits with the same composition but three different degrees of crystallization were prepared by introducing some nucleating agents to provide nucleation sites for the formation of the crystal structure of the glass-Frit. The phase structure of the glass Frits was characterized using X-ray diffraction. The Ag–Si contacts were investigated using scanning electron microscopy, and the results indicated that glass Frit with a moderate crystallization degree facilitated to acquire optimal size crystalline Ag, which was distributed uniformly in the glass layer and silicon substrate. Therefore, an excellent metallized contact was achieved. In addition, the particle size and proportion of glass Frit in the paste also had an impact on the electrical properties of the solar cells. The results demonstrated that a silver paste consisting of 3 wt% crystalline glass Frit with a particle size of 3.12 μm not only ensured sufficient adhesion of the silver electrode, but also improved the Ag–Si contact to enhance the conversion efficiency of the solar cells.
Bekir Karasu - One of the best experts on this subject based on the ideXlab platform.
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Evaluation of borax solid wastes in production of Frits suitable for fast single-fired wall tile opaque glass-ceramic glazes
Bulletin of Materials Science, 2010Co-Authors: Kerem Pekkan, Bekir KarasuAbstract:Zircon (zirconium silicate, ZrSiO4) is the main opacifier of glossy, opaque, white-coloured, Frit-based wall tile glazes. However, zirconia containing Frits employed in the preparation of these glazes raise the production cost limiting zircon usage as a raw material at an industrial scale. Therefore, there have been several searches on seeking for alternative Frit compositions with lower or without zirconia content. Consequently, positive outcomes were recently reported. With the present study, 1·5–5% of borax concentrator waste replaced certain level of acid boric for B2O3 content in a low zircon containing Frit recipe. It is confirmed that waste contribution did not distort the surface properties of the fast single-fired wall tile opaque glazes. Zircon was found to be the main crystal phase of the glazes in laboratory trials. Industrial applications revealed that shorter firing cycles lead to zircon and petedunnite (CaZnSi2O6) formation in the CW-4 glaze.
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Zircon-free Frits suitable for single fast-firing opaque wall tile glazes and their industrial productions
Journal of The European Ceramic Society, 2009Co-Authors: Kerem Pekkan, Bekir KarasuAbstract:Abstract Wall tile glazes with a smooth surface texture, high glossiness, and whiteness are usually based on zirconium containing Frits. However, these Frits are quite expensive and therefore, there have recently been certain attempts to lower the production cost such as taking suitable glass–ceramic glaze systems into an account. With the present work, the Frit-based glaze compositions belonging to the K 2 O–MgO–CaO–ZnO–Al 2 O 3 –B 2 O 3 –SiO 2 glass–ceramic system were studied to prepare newly synthesized wall tile glazes for industrial single fast-firing. The design of a glass–ceramic glaze for this type of tiles should ensure that the selected Frit precursor is technically and commercially compatible with the manufacturing conditions generally used in the production of glazed ceramic wall tiles. The aim of the study is to develop zircon-free, Frit-based, glossy opaque glass–ceramic glazes for wall tiles by optimizing the CaO/MgO and adjusting the Al 2 O 3 /alkali ratios in the starting Frit compositions. Frit production, glaze preparation, application, and single fast-firing of wall tiles were, first of all, conducted under laboratory working conditions and then, successful recipes were adapted to the relevant industry. The Frit crystallization capability and crystallization temperature range were determined by differential thermal analysis (DTA). Thermal expansion coefficient values of glazes were determined by a dilatometer. Characterization of single fast-fired glass–ceramic glazes was made by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray (EDX) techniques. Colour and gloss analyses of the final glazes were measured with a spectrophotometer and a gloss meter, respectively.
