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Preparation of high-resolution radiation detector by the control of CdTe-metal interface states

Research Project

Project/Area Number 24560061
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Applied physics, general
Research InstitutionUniversity of the Ryukyus

Principal Investigator

YAMAZATO Masaaki  琉球大学, 工学部, 教授 (10322299)

Project Period (FY) 2012-04-01 – 2015-03-31
Project Status Completed (Fiscal Year 2014)
Budget Amount *help
¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2014: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2012: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywordsテルル化カドミウム / 表面処理 / 放射線検出素子 / ショットキーダイオード / 金属半導体界面
Outline of Final Research Achievements

We have investigated the effects of plasma and sulfur treatments on the properties of Schottky-type CdTe radiation detector. In this research, various metals (Mg, Ti, Al, Ni) were used as the electrodes of CdTe diodes, and the barrier heights of them were estimated. In spite of different work functions of metals, the Schottky barrier heights showed almost same values. This result strongly suggests the Fermi level is pinned by the interface states. The surface states of plasma treated and the sulfur treated CdTe were estimated by the conductive-AFM. The surface was uniformly covered by the relatively high resistivity layer after sulfur treatment, while that of plasma treated sample was covered by low-resistivity particles and high-resistivity grain boundaries. We succeeded in the preparation of high-stability radiation detector by the sulfur treatment. These results suggests that the properties of interface layer between electrode and CdTe affects the quality of radiation detection.

Report

(4 results)
  • 2014 Annual Research Report   Final Research Report ( PDF )
  • 2013 Research-status Report
  • 2012 Research-status Report
  • Research Products

    (4 results)

All 2014 2013

All Presentation (4 results)

  • [Presentation] CdTe上へのショットキー電極形成における表面処理の影響2014

    • Author(s)
      江崎麦,山里将朗,比嘉晃
    • Organizer
      第75回応用物理学会秋季学術講演会
    • Place of Presentation
      北海道大学
    • Year and Date
      2014-09-17 – 2014-09-20
    • Related Report
      2014 Annual Research Report
  • [Presentation] Effect of plasma treatment on the formation of schottky contacts on CdTe surface for Radiation Detector2014

    • Author(s)
      M. Yamazato, M. Ezaki, A. Higa
    • Organizer
      International Symposium on Electrohydrodynamics 2014
    • Place of Presentation
      Beach Tower, Okinawa
    • Year and Date
      2014-06-23 – 2014-06-25
    • Related Report
      2014 Annual Research Report
  • [Presentation] CdTe結晶上へのMg電極形成と特性評価2013

    • Author(s)
      町田香奈子,山里将朗,比嘉晃
    • Organizer
      第74回応用物理学会秋季学術講演会
    • Place of Presentation
      同志社大学,京都府
    • Related Report
      2013 Research-status Report
  • [Presentation] 硫黄処理したCdTe結晶表面状態の分析2013

    • Author(s)
      江崎麦
    • Organizer
      琉球大学工学部・沖縄高専学生研究発表会
    • Place of Presentation
      沖縄高専
    • Related Report
      2012 Research-status Report

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Published: 2013-05-31   Modified: 2019-07-29  

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