Oyo Buturi
Online ISSN : 2188-2290
Print ISSN : 0369-8009
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Volume 83, Issue 8
OYO-BUTURI Vol.83 No.8
Displaying 1-12 of 12 articles from this issue
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Science As Art
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Recent Developments
  • The development of TaOx-based resistive RAM
    Takeki NINOMIYA
    2014 Volume 83 Issue 8 Pages 651-654
    Published: August 10, 2014
    Released on J-STAGE: September 27, 2019
    DOIhttps://doi.org/10.11470/oubutsu.83.8_651
    JOURNAL FREE ACCESS
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    To guarantee the reliability of non-volatile memory, it is essential to establish a model. We clarified that control of the oxygen defect concentration in the conductive filament is necessary for maintaining desirable data from the resistive RAM. In addition, in order to keep a high concentration of oxygen defects even with low-current operations, we believed that it was necessary to scale down the conductive filament by using the load characteristics of the TaOx layer. By doing so, we were successful in obtaining a desirable data retention of 1000 hours or longer at 150°C with low-current operation at 80µA.

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Our Research
  • Semiconductor devices for space science missions
    Kazuyuki HIROSE, Daisuke KOBAYASHI
    2014 Volume 83 Issue 8 Pages 655-659
    Published: August 10, 2014
    Released on J-STAGE: September 27, 2019
    DOIhttps://doi.org/10.11470/oubutsu.83.8_655
    JOURNAL FREE ACCESS
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    We study semiconductor devices for space science missions. Physical phenomena and device/circuit responses observed in radiation environments are reviewed. Radiation hardening techniques for advanced SOI devices such as an MPU are also shown.

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  • Coverage up to the infrared region
    cocktail perovskite solar cells
    Shuzi HAYASE
    2014 Volume 83 Issue 8 Pages 660-664
    Published: August 10, 2014
    Released on J-STAGE: September 27, 2019
    DOIhttps://doi.org/10.11470/oubutsu.83.8_660
    JOURNAL FREE ACCESS
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    Printable Pb perovskite solar cells have attracted interest because of a high power conversion efficiency that can reach 17%. However, the light harvesting region has been limited in the visible region to 800 nm. In order to increase the power conversion efficiency further, device structures harvesting energy from the near infrared area are desired. We have succeeded in harvesting light up to 1000 nm by using Sn/Pb cocktail perovskite materials. HOMO-LUMO energy levels were tunable and the stability in air was improved by changing the Sn/Pb ratio. When this was compared to a Pb perovskite solar cell with 14.3% efficiency, the decrease in shunt resistance was remarkable. In order to increase the efficiency further, a design for the charge separation interface that avoids charge recombination is needed.

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