The effect of cathode bias (field effect) on the surface leakage current of CdZnTe detectors

A.E. Bolotnikov, C.M.H. Chen, W.R. Cook, F.A. Harrison, Irfan Kuvvetli, S.M. Schindler, C.M. Stahle, B.H. Parker

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Surface resistivity is an important parameter of multi-electrode CZT detectors such as coplanar-grid, strip, or pixel detectors. Low surface resistivity results in a high leakage current and affects the charge collection efficiency in the areas near contacts. Thus, it is always desirable to have the surface resistivity of the detector as high as possible. In the past the most significant efforts were concentrated to develop passivation techniques for CZT detectors. However, as we found, the field-effect caused by a bias applied on the cathode can significantly reduce the surface resistivity even though the detector surface was carefully passivated. In this paper we illustrate that the field-effect is a common feature of the CZT multi-electrode detectors, and discuss how to take advantage of this effect to improve the surface resistivity of CZT detectors.
Original languageEnglish
JournalNuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
Volume510
Issue number3
Pages (from-to)300-308
ISSN0168-9002
Publication statusPublished - 2003

Keywords

  • pixel detectors
  • field-effect
  • CdZnTe

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