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Proceedings Paper

Development of gold-contacted flip-chip detectors with IMARAD CZT
Author(s): Tomohiko Narita; Peter Forbes Bloser; Jonathan E. Grindlay; Jonathan A. Jenkins
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Paper Abstract

We present initial results from our evaluation of a gold- contacted pixellated detector using cadmium zinc telluride substrate produced by IMARAD Imaging Systems. The Horizontal Bridgman (HB) grown crystals from IMARAD have been shown to produce high resolution photopeaks, but they are also seen to have large leakage current. Our previous tests with IMARAD CZT showed that the use of indium anodes and gold cathode improved the resistivity compared to the standard indium-contacted detectors. We seek to test whether simple evaporated gold contacts alone could also reduce the leakage current and thus improve the spectral resolution, especially in the 10 - 100 keV energy range. We have fabricated several metal- semiconductor-metal (MSM) detectors with a 4 X 4 array of pixels on 10 X 10 mm substrates. Measurements of the detectors' leakage current, spectral response, and temperature sensitivity are presented and compared to IMARAD's ohmic contact detector and gold contact MSM detectors made of High Pressure Bridgman (HPB) material. Finally, we show preliminary results from a tiled flip-chip pixellated detector made using the IMARAD detectors.

Paper Details

Date Published: 21 November 2000
PDF: 8 pages
Proc. SPIE 4141, Hard X-Ray, Gamma-Ray, and Neutron Detector Physics II, (21 November 2000); doi: 10.1117/12.407569
Show Author Affiliations
Tomohiko Narita, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Peter Forbes Bloser, Harvard-Smithsonian Ctr. for Astrophysics (Germany)
Jonathan E. Grindlay, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Jonathan A. Jenkins, Harvard-Smithsonian Ctr. for Astrophysics (United States)


Published in SPIE Proceedings Vol. 4141:
Hard X-Ray, Gamma-Ray, and Neutron Detector Physics II
Ralph B. James; Richard C. Schirato, Editor(s)

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