Charge Loss and Charge Sharing Measurements for Two Different Pixelated Cadmium-Zinc-Telluride Detectors

Details Charge Loss and Charge Sharing Measurements for Two Different Pixelated Cadmium-Zinc-Telluride Detectors Charge Loss and Charge Sharing Measurements for Two Different Pixelated Cadmium-Zinc-Telluride Detectors

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003head....7.2232g&link_type=abstract

American Astronomical Society, HEAD meeting #7, #22.32; Bulletin of the American Astronomical Society, Vol. 35, p.865

Physics

Optics

Scientific paper

As part of ongoing research at Marshall Space Flight Center, Cadmium-Zinc-Telluride (CdZnTe) multi-pixel detectors are being developed for use at the focal plane of the High Energy Replicated Optics (HERO) telescope. HERO requires a 64x64 pixel array with a spatial resolution of around 200 microns (with a 6 meter focal length) and high energy resolution (< 2% at 60keV). We are currently testing smaller arrays as a necessary first step towards this goal. In this presentation, we compare charge sharing and charge loss measurements between two devices that differ both electronically and geometrically. The first device consists of a 1-mm-thick piece of CdZnTe that is sputtered with a 4x4 array of pixels with pixel pitch of 750 microns (inter-pixel gap is 100 microns). The signal is read out using discrete ultra-low-noise preamplifiers, one for each of the 16 pixels. The second detector consists of a 2-mm-thick piece of CdZnTe that is sputtered with a 16x16 array of pixels with a pixel pitch of 300 microns (inter-pixel gap is 50 microns). Instead of using discrete preamplifiers, the crystal is bonded to an ASIC that provides all of the front-end electronics to each of the 256 pixels.
Further, we compare the measured results with simulated results and discuss to what degree the bias voltage (i.e. the electric field) and hence the drift and diffusion coefficients affect our measurements.

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