Photocurrent mapping as a probe of transport properties and electric field distributions in cadmium zinc telluride detectors

We have performed two-dimensional cross-sectional photocurrent mapping of Cd/sub 0.9/Zn/sub 0.1/Te detectors grown by the high-pressure Bridgman method as a means of probing the electric field distribution. We have analyzed the results using a model based on the drift-diffusion equation. In the case...

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Bibliographic Details
Published inIEEE transactions on nuclear science Vol. 44; no. 4; pp. 1684 - 1691
Main Authors Toney, J.E., Brunett, B.A., Schlesinger, T.E., James, R.B.
Format Journal Article
LanguageEnglish
Published IEEE 01.08.1997
Subjects
Data analysis
Detectors
Electrodes
Electron mobility
Equations
Nonuniform electric fields
Photoconductivity
Probes
Tellurium
Zinc
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Summary:We have performed two-dimensional cross-sectional photocurrent mapping of Cd/sub 0.9/Zn/sub 0.1/Te detectors grown by the high-pressure Bridgman method as a means of probing the electric field distribution. We have analyzed the results using a model based on the drift-diffusion equation. In the case of a uniform electric field and excitation far from the electrodes, the result is virtually identical in form to the Hecht relation. We adapt the Hecht relation to analyze photocurrent data and generalize it to the case of a nonuniform electric field. The spatial distribution of photocurrent for the material that we have examined suggests a nonuniformity in either the electric field or the electron mobility-lifetime product. These observations may help to explain the slope changes observed in detector response pulses.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0018-9499
1558-1578
DOI:10.1109/23.604133