1986 …2020

Research output per year

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Personal profile

Research Interests

Flash Memory Devices and Circuits, Integrated Circuit Systems, 2D、 3D Semiconductor Devices

Experience

1982~1986, had been in Memory division of Toshiba Corporation in charge of DRAM device development from 64K 

1986~1987, moved to R&D center in Toshiba; Section leader of Non-volatile memory

1987~1990 made basic research of NAND Flash memory for the first time in the world, group leader of NAND Flash group

1990~2004, responsible to the development of NAND Flash memory from 4M to 8Gbit, project leader of the NAND development combined research center and memory division

2004~2006, moved to the Flash business strategy group as a chief specialist in memory division

2004~2006, IEEE Non-volatile Memory workshop Panelist

2004~2006, ITRS road map of Japanese committee

2004~2008, IEEE Non-volatile workshop committee

2005 ~ 2006, assigned as the guest professor of Beijing institute of technology

2005, Tutorial of IRPS

2006~ Chair Professor of Tsing Hua University

2006~ consultant of NAND Flash memory development in Power Chip Corporation

2009, Invited Lecture in Chiba University, Tokyo, Japan

2009, Invited Lecture in Nagoya University, Nagoya, Japan

2009, Technology Rump Session R-1: The Path Towards Sub 30nm NVM, Moderators, Symposium on VLSI Technology

2010, Invited Lecture in Osaka University, Osaka, Japan

2010, Advanced Metallization Conference, Tokyo, Japan

Education/Academic qualification

PhD, Nagoya University

External positions

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Projects

運用於非揮發性記憶體、高端邏輯元件與液晶顯示器之奈米薄膜電晶體研究

Shirota, R.

1/08/2031/07/21

Project: Government MinistryMinistry of Science and Technology

Research of NAND Flash Reliability with Less Then 40nm Technology Node

Shirota, R.

1/10/1330/09/14

Project: Government MinistryMinistry of Science and Technology

Research of NAND Flash Reliability with Less Then 40nm Technology Node

Shirota, R.

1/10/1230/09/13

Project: Government MinistryMinistry of Science and Technology

Research of NAND Flash Reliability with Less Then 40nm Technology Node

Shirota, R.

1/10/1130/09/12

Project: Government MinistryMinistry of Science and Technology

Research Output

The effect of hydrogen on programmed threshold-voltage distribution in NAND flash memories

Chiu, Y. Y., Lin, C. H., Yang, J. S., Yang, B. J., Aoki, M., Takeshita, T., Yano, M. & Shirota, R., 1 Aug 2019, In : Japanese Journal of Applied Physics. 58, 8, 081002.

Research output: Contribution to journalArticle

Open Access
  • Transconductance distribution in program/erase cycling of NAND flash memory devices: A statistical investigation

    Chiu, Y. Y., Lin, I. C., Chang, K. C., Yang, B. J., Takeshita, T., Yano, M. & Shirota, R., 1 Mar 2019, In : IEEE Transactions on Electron Devices. 66, 3, p. 1255-1261 7 p., 8631191.

    Research output: Contribution to journalArticle

  • 1 Scopus citations

    Evaluation of the Role of Deep Trap State Using Analytical Model in the Program/Erase Cycling of NAND Flash Memory and Its Process Dependence

    Yang, B. J., Wu, Y. T., Chiu, Y. Y., Kuo, T. M., Chang, J. H., Wang, P. Y. & Riichiro, S., 1 Feb 2018, In : IEEE Transactions on Electron Devices. 65, 2, p. 499-506 8 p., 8245902.

    Research output: Contribution to journalArticle

  • 1 Scopus citations

    Analytical Model to Evaluate the Role of Deep Trap State in the Reliability of NAND Flash Memory and Its Process Dependence

    Yang, B. J., Wu, Y. T., Chiu, Y. Y., Riichiro, S., Kuo, T. M., Chang, J. H. & Wang, P. Y., 15 Jun 2016, 2016 IEEE 8th International Memory Workshop, IMW 2016. Institute of Electrical and Electronics Engineers Inc., 7493567. (2016 IEEE 8th International Memory Workshop, IMW 2016).

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

  • 1 Scopus citations

    Impact of String Pattern on the Threshold-Voltage Spread of Program-Inhibited Cell in NAND Flash

    Chiu, Y. Y., Aoki, M., Yano, M. & Shirota, R., 1 Jul 2016, In : IEEE Journal of the Electron Devices Society. 4, 4, p. 174-178 5 p., 7467394.

    Research output: Contribution to journalArticle

    Open Access
  • 3 Scopus citations

    Prizes

    Fellow, IEEE

    Shirota, Riichiro (Recipient), 2018

    Prize: Honorary award

    Toshiba Award (Two times), Toshiba

    Shirota, Riichiro (Recipient), 2000

    Prize: Honorary award