Gamma-ray response of semi-insulating CdMnTe crystals

Kihyun Kim, Shinhang Cho, Jonghee Suh, Jinki Hong, Sunung Kim

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

Semi-insulating Cd 0.9Mn 0.1Te: In crystals are grown by vertical Bridgman method. The segregation coefficient of Mn in CdTe is nearly 1 so that all the CdMnTe samples obtained from one ingot have nearly a same Mn composition. Also sulfur-based passivation effectively prevent the formation of Te-oxide but large amount of Mn exist as a MnO on the CdMnTe surface. The resistivity of CdMnTe samples are low 1010Ω cm and well resolved241Am gamma peaks are seen for all detectors. The difference in spectral response can be attributed to the effect of excess Te and conductivity change due to over-compensation induced by indium segregation in CdMnTe. The mobility-lifetime products evaluated from the dependence of peak location on the bias voltage are 1 × 10-3 cm2 V . The higher mobility-lifetime products in our CdMnTe crystals than other previous reports are assumed due to minimization of impurity contents in MnTe by several zone refining process.

Original languageEnglish
Article number5076020
Pages (from-to)858-862
Number of pages5
JournalIEEE Transactions on Nuclear Science
Volume56
Issue number3
DOIs
Publication statusPublished - 2009 Jun 1

Keywords

  • CdMnTe
  • CdZnTe
  • Compensation
  • Segregation coefficient
  • Sulfur passivation
  • X-ray detector

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Electrical and Electronic Engineering

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