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  1. Article: Significant Enhancement of Piezoelectric Response in AlN by Yb Addition.

    Hirata, Kenji / Mori, Yuto / Yamada, Hiroshi / Uehara, Masato / Anggraini, Sri Ayu / Akiyama, Morito

    Materials (Basel, Switzerland)

    2021  Volume 14, Issue 2

    Abstract: This study employs first-principles calculations to investigate how introducing Yb into aluminum nitride (AlN) leads to a large enhancement in the material's piezoelectric response ( ...

    Abstract This study employs first-principles calculations to investigate how introducing Yb into aluminum nitride (AlN) leads to a large enhancement in the material's piezoelectric response (
    Language English
    Publishing date 2021-01-09
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma14020309
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Polarity Inversion of Aluminum Nitride Thin Films by using Si and MgSi Dopants.

    Anggraini, Sri Ayu / Uehara, Masato / Hirata, Kenji / Yamada, Hiroshi / Akiyama, Morito

    Scientific reports

    2020  Volume 10, Issue 1, Page(s) 4369

    Abstract: Polarity is among the critical characteristics that could governs the functionality of piezoelectric materials. In this study, the polarity of aluminum nitride (AlN) thin films was inverted from Al-polar to N-polar by doping Si into AlN in the range of 1- ...

    Abstract Polarity is among the critical characteristics that could governs the functionality of piezoelectric materials. In this study, the polarity of aluminum nitride (AlN) thin films was inverted from Al-polar to N-polar by doping Si into AlN in the range of 1-15 at.%. Polarity inversion from Al-polar to N-polar also occurred when MgSi was codoped into AlN with Mg to Si ratio was less than 1. However, the polarity can be reversed from N-polar to Al-polar when the ratio of Mg and Si was greater than 1. The effect of Si and MgSi addition was investigated with regards to their crystal structure, lattice parameters, polarity distribution and the oxidation state of each elements. Furthermore, the effect of intermediate layer as well as the presence of point defect (i.e. aluminum vacancy) were investigated and how these factors influence the polarity of the thin films are discussed in this report.
    Language English
    Publishing date 2020-03-09
    Publishing country England
    Document type Journal Article
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-020-61285-8
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: First-Principles Study of Piezoelectric Properties and Bonding Analysis in (Mg, X, Al)N Solid Solutions (X = Nb, Ti, Zr, Hf).

    Hirata, Kenji / Yamada, Hiroshi / Uehara, Masato / Anggraini, Sri Ayu / Akiyama, Morito

    ACS omega

    2019  Volume 4, Issue 12, Page(s) 15081–15086

    Abstract: The enhancement mechanism of piezoelectric properties by codoping Mg + X (X = Nb, Ti, Zr, Hf) into aluminum nitride (AlN) was investigated by first-principles calculations. Theoretically, the piezoelectric constant ( ...

    Abstract The enhancement mechanism of piezoelectric properties by codoping Mg + X (X = Nb, Ti, Zr, Hf) into aluminum nitride (AlN) was investigated by first-principles calculations. Theoretically, the piezoelectric constant (
    Language English
    Publishing date 2019-09-04
    Publishing country United States
    Document type Journal Article
    ISSN 2470-1343
    ISSN (online) 2470-1343
    DOI 10.1021/acsomega.9b01912
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article: High-efficiency dye-sensitized solar cell based on a nitrogen-doped nanostructured titania electrode.

    Ma, Tingli / Akiyama, Morito / Abe, Eiichi / Imai, Isao

    Nano letters

    2005  Volume 5, Issue 12, Page(s) 2543–2547

    Abstract: A highly efficient dye-sensitized solar cell (DSC) was fabricated using a nanocrystalline nitrogen-doped titania electrode. The properties of the nitrogen-doped titania powder, film, and solar cell were investigated. The substitution of oxygen sites with ...

    Abstract A highly efficient dye-sensitized solar cell (DSC) was fabricated using a nanocrystalline nitrogen-doped titania electrode. The properties of the nitrogen-doped titania powder, film, and solar cell were investigated. The substitution of oxygen sites with nitrogen atoms in the titania structure was confirmed by X-ray photoemission spectroscopy (XPS). The UV-vis spectrum of the nitrogen-doped powder and film showed a visible light absorption in the wavelength range from 400 to 535 nm. An enhancement of the incident photon-to-current conversion efficiency (IPCE) in the range of 380-520 nm and 550-750 nm was observed. An 8% overall conversion efficiency has been achieved. The results of the stability test indicated that the solar cell fabricated by the nitrogen-doped titania exhibited great stability.
    MeSH term(s) Coloring Agents/chemistry ; Electric Power Supplies ; Equipment Design ; Equipment Failure Analysis ; Light ; Microelectrodes ; Nanostructures/chemistry ; Nanostructures/radiation effects ; Nanostructures/ultrastructure ; Nanotechnology/instrumentation ; Nanotechnology/methods ; Nitrogen/chemistry ; Photochemistry/instrumentation ; Photochemistry/methods ; Solar Energy ; Titanium/chemistry
    Chemical Substances Coloring Agents ; titanium dioxide (15FIX9V2JP) ; Titanium (D1JT611TNE) ; Nitrogen (N762921K75)
    Language English
    Publishing date 2005-12-15
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1530-6984
    ISSN 1530-6984
    DOI 10.1021/nl051885l
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Enhancement of piezoelectric response in scandium aluminum nitride alloy thin films prepared by dual reactive cosputtering.

    Akiyama, Morito / Kamohara, Toshihiro / Kano, Kazuhiko / Teshigahara, Akihiko / Takeuchi, Yukihiro / Kawahara, Nobuaki

    Advanced materials (Deerfield Beach, Fla.)

    2010  Volume 21, Issue 5, Page(s) 593–596

    Language English
    Publishing date 2010-12-14
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 1474949-X
    ISSN 1521-4095 ; 0935-9648
    ISSN (online) 1521-4095
    ISSN 0935-9648
    DOI 10.1002/adma.200802611
    Database MEDical Literature Analysis and Retrieval System OnLINE

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