Construction of a low work function surface for an efficient energy converter

• Project/Area Number: 15K21048
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Power engineering/Power conversion/Electric machinery; Thin film/Surface and interfacial physical properties
• Research Institution: Shizuoka University
• Principal Investigator: MASUZAWA Tomoaki 静岡大学, 電子工学研究所, 助教 (40570289)
• Research Collaborator: YAMADA Takatoshi ; OKANO Ken
• Project Period (FY): 2015-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000); Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2015: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
• Keywords: 熱電変換 / 真空デバイス / 電子源 / 低仕事関数 / ダイヤモンド / PETE / 炭素表面 / 表面 / 電子放出 / TEC / 発電素子

Outline of Final Research Achievements

In this research, low work function surfaces were created and investigated for applications in photon-enhanced thermal energy converters. Since the efficiency of such device largely depended on a work function of a collector, formation of a carbon surfaces was extensively studied for its low work function and thermal stability.
Formation of a uniform polycrystalline diamond surface by using nano-diamond precursors was established. As for the evaluation of work functions, Cs coated surface of GaAs as well as n-type single crystal diamond were investigated, which resulted in discovery of key schemes for enhancing a performance of energy converters.

Research Products

• [Journal Article] Modification of internal barrier in hydrogen-terminated heavily phosphorus-doped diamond for field emission (2016)
  • Author(s): T. Masuzawa, Y. Kudo, H. Mimura, Y. Neo, K. Okano, T. Yamada
  • Journal Title: physica status solidi (a) Volume: 213 Issue: 8 Pages: 2063-2068
  • DOI: 10.1002/pssa.201600099
  • Peer Reviewed / Acknowledgement Compliant
• [Journal Article] Electron emission from conduction band of heavily phosphorus doped diamond negative electron affinity surface (2016)
  • Author(s): Takatoshi Yamada, Tomoaki Masuzawa, Hidenori Mimura and Ken Okano
  • Journal Title: Journal of Physics D: Applied Physics Volume: 49 Issue: 4 Pages: 045102-045102
  • DOI: 10.1088/0022-3727/49/4/045102
  • Peer Reviewed
• [Presentation] Development of an amorphous selenium based photoconductor and its application in a high-sensitivity photodetector (2016)
  • Author(s): T. Masuzawa, T. Ebisudani, J. Ochiai, I. Saito, T. Yamada, D. H. C. Chua, H. Mimura, K. Okano
  • Organizer: SPIE Optics+Photonics 2016
  • Place of Presentation: San Diego Convention Center, San Diego, USA
  • Year and Date: 2016-08-28
  • Int'l Joint Research / Invited
• [Presentation] GaAs負性電子親和力カソードの応答速度について (2016)
  • Author(s): 光野圭悟, 増澤智昭, 畑中義式, 根尾陽一郎, 三村秀典
  • Organizer: 第63回応用物理学会春季学術講演会
  • Place of Presentation: 東京工業大学大岡山キャンパス，東京都目黒区
  • Year and Date: 2016-03-19
• [Presentation] Surface activation of GaAs photocathode and its photoemission characteristics (2015)
  • Author(s): T. Masuzawa, K. Mitsuno, Y. Hatanaka, Y. Neo and H. Mimura
  • Organizer: The 22nd International Display Workshop
  • Place of Presentation: Lake Biwa Otsu Prince Hotel,Otsu,Japan
  • Year and Date: 2015-12-09
  • Int'l Joint Research
• [Presentation] GaAsフォトカソードの表面活性過程と分光感度特性 (2015)
  • Author(s): 増澤智昭, 光野圭悟, 畑中義式, 根尾陽一郎, 三村秀典
  • Organizer: 電子情報通信学会電子デバイス研究会
  • Place of Presentation: 名城大学名駅サテライト，愛知県名古屋市
  • Year and Date: 2015-10-22
• [Presentation] 高濃度窒素添加ダイヤモンドを用いた電子源の試作 ～ 鋳型成長を用いた電極一体・平板型エミッターの製作 ～ (2015)
  • Author(s): 胡谷大志, 増澤智昭, 山田貴壽, 落合潤, 斎藤市太郎, 岡野健
  • Organizer: 電子情報通信学会電子デバイス研究会
  • Place of Presentation: 名城大学名駅サテライト，愛知県名古屋市
  • Year and Date: 2015-10-22
• [Presentation] GaAs負性電子親和力カソードの活性化過程における放出電子エネルギー分布 (2015)
  • Author(s): 光野圭悟, 増澤智昭, 畑中義式, 根尾陽一郎, 三村秀典
  • Organizer: 第76回応用物理学会秋季学術講演会
  • Place of Presentation: 名古屋国際会議場，愛知県名古屋市
  • Year and Date: 2015-09-13
• [Presentation] Development of arrayed diamond emitter for photo imaging application (2015)
  • Author(s): T. Masuzawa, T. Ebisudani, A. Ohata, J. Ochiai, I. Saito, T. Yamada, H. Wang, T. Loh, D. Chua, H. Mimura and K. Okano
  • Organizer: 28th International Vacuum Nanoelectronics Conference
  • Place of Presentation: Sun Yat-sen University,Guangzhou,China
  • Year and Date: 2015-07-13
  • Int'l Joint Research
• [Presentation] Characterization of graphite field emitter inflamed at high temperature (2015)
  • Author(s): Y. Neo, T. Masuzawa, Y. Iwai, A. Jozuka, T. Nakamura, T. Aoki, H. Mimura
  • Organizer: 28th International Vacuum Nanoelectronics Conference
  • Place of Presentation: Sun Yat-sen University,Guangzhou,China
  • Year and Date: 2015-07-13
  • Int'l Joint Research
• [Presentation] Activation process of GaAs NEA Photocathode and its spectral sensitivity (2015)
  • Author(s): K. Mitsuno, T. Masuzawa, Y. Hatanaka, Y. Neo and H. Mimura
  • Organizer: 28th International Vacuum Nanoelectronics Conference
  • Place of Presentation: Sun Yat-sen University,Guangzhou,China
  • Year and Date: 2015-07-13
  • Int'l Joint Research
• [Presentation] Work function modulations of h-BN using graphene for field emitters (2015)
  • Author(s): T.Yamada, M. Hasegawa, T.Masuzawa, Y.Neo, H.Mimura, T.Ebisudani, K. Okano and T. Taniguchi
  • Organizer: 9th International Conference on New Diamond and Nano Carbons
  • Place of Presentation: Shizuoka Convention & Arts Center,Shizuoka,Japan
  • Year and Date: 2015-05-24
  • Int'l Joint Research