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21 results on '"Morishita Naoya"'

9. Contact control of Al/Si interface of Si solar cells by local contact opening method

Author

Noritaka Usami, Kosuke Tsuji, Adrian Adrian, Masahiro Nakahara, Thomas Buck, Marwan Dhamrin, Takashi Kuroki, Shota Suzuki, Morishita Naoya, and Zih-Wei Peng

Subjects
Materials science, Silicon, Analytical chemistry, chemistry.chemical_element, Sintering, 02 engineering and technology, Substrate (electronics), 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, 0104 chemical sciences, chemistry, Aluminium, General Materials Science, 0210 nano-technology, Saturation (magnetic), Recombination current, Finger widths, Eutectic system
Abstract

Low-cost aluminum (Al) metallization process on p+ side of n-type silicon (Si) substrate with low recombination current density (J0met) is presented. Narrow-line Al screen-printed fingers on symmetrically passivated p+ -n-p+ Si precursors with local contact opening (LCO) are investigated. The Si content of the Al pastes, LCO patterns and Al finger widths are varied to evaluate the formation quality of the Al-doped p+ region. By increasing the pitch distance of the dot-shaped LCOs, the inverted pyramid cavities are found after removing the Al-Si eutectic part by HCl. The tendency of the reaction during the sintering process is controlled by fritting the Al paste with Si, which allows a faster Si saturation in the paste matrix and facilitates faster return of Si to the LCO region. With a combination of narrow-line fingers of 90 μm and a dot-shaped LCO pitch of 140 μm, J0met value of 420 fA/cm2 is realized.

Published
2021
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10. Fine line Al printing on narrow point contact opening for front side metallization

Author

Kosuke Tsuji, Thomas Buck, Marwan Dhamrin, Noritaka Usami, Masahiro Nakahara, Takashi Kuroki, Morishita Naoya, Zih-Wei Peng, and Shota Suzuki

Subjects
Materials science, business.industry, Alloy, Doping, Front (oceanography), chemistry.chemical_element, engineering.material, Fine line, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, chemistry, Aluminium, Saturation current, engineering, Optoelectronics, business, Layer (electronics), Common emitter
Abstract

Aluminum (Al) screen-printed narrow fingers on textured passivated emitter and rear totally diffused (n-PERT) front junction Si solar cells are applied and investigated. Commercial Al paste is screen-printed on symmetric test structures with different Local Contact Opening (LCO) designs by varying the dot-to-dot distances and finger widths. Strong dependency of the metal-silicon saturation current density (J0-met) is found for the considered geometries. Narrow Al grid metallization induced emitter recombination current density can be decreased by optimizing the dot-dot distance. Best results of our test matrix were determined for an 80 µm dot-dot pitch, realizing J0-met values down to 649 fA/cm2 when using narrow fingers of 65 µm compared with the J0-met of 1100 fA/cm2 identified for a commercial Ag/Al paste. For dot-to-dot distances below 40 µm, common pattern of bifacial p-type PERC, fingers with widths exceeding 120 µm are needed to realize J0-met values below 400 fA/cm2. Additionally, the shape and size of the Al-Si alloy and p++ doping layer depth after firing are strongly affected by the combination of dot-to-dot distances and screen-printed finger widths.

Published
2019
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21. A combined lymphokine-activated killer (LAK) cell immunotherapy and adenovirus-p53 gene therapy for head and neck squamous cell carcinoma.

Author

Saito H, Ando S, Morishita N, Lee KM, Dator D, Dy D, Shigemura K, Adhim Z, Nibu K, Fujisawa M, and Shirakawa T

Subjects
Adenoviridae genetics, Carcinoma, Squamous Cell genetics, Carcinoma, Squamous Cell immunology, Cell Line, Tumor, Combined Modality Therapy, Cytotoxicity, Immunologic, GPI-Linked Proteins biosynthesis, GPI-Linked Proteins genetics, Head and Neck Neoplasms genetics, Head and Neck Neoplasms immunology, Humans, Hypopharyngeal Neoplasms genetics, Hypopharyngeal Neoplasms immunology, Intracellular Signaling Peptides and Proteins biosynthesis, Intracellular Signaling Peptides and Proteins genetics, RNA, Messenger biosynthesis, RNA, Messenger genetics, Squamous Cell Carcinoma of Head and Neck, Tumor Necrosis Factor-alpha biosynthesis, Tumor Necrosis Factor-alpha genetics, Tumor Suppressor Protein p53 genetics, Carcinoma, Squamous Cell therapy, Genes, p53, Genetic Therapy methods, Head and Neck Neoplasms therapy, Hypopharyngeal Neoplasms therapy, Immunotherapy, Adoptive methods, Killer Cells, Lymphokine-Activated immunology
Abstract

Background: The antitumor activity of lymphokine activated killer (LAK) cells immunotherapy is not always effective in all patients, especially when used alone. In this study, we investigated the in vitro antitumor activities of a combination of LAK immunotherapy and gene therapy employing an adenovirus carrying the p53 gene (Ad-p53) in human head and neck squamous cell carcinoma., Materials and Methods: The in vitro cytotoxicity of LAK cells was tested in H891 cells infected with or without Ad-p53, and the mRNA expression levels of natural killer group 2D ligands (UL16 binding protein (ULBP) 1 to 5) and tumor necrosis factor (TNF-α) in these cells were measured by real-time reverse transcription polymerase chain reaction., Results: Ad-p53 infection increased the cytotoxicity of LAK cells against H891 cells, and also increased the mRNA expression levels of the ULBPs in H891 cells and TNF-α in the LAK cells., Conclusion: The antitumor activities of LAK cells in H891 cells were enhanced by Ad-p53., Conclusion: The combinational therapy of LAK immunotherapy and Ad-p53 gene therapy may represent a new paradigm for the treatment of head and neck cancer., (Copyright© 2014 International Institute of Anticancer Research (Dr. John G. Delinassios), All rights reserved.)

Published
2014

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