Skip to main content

Characterization of CdTe sensors with Schottky contacts coupled to charge-integrating pixel array detectors for X-ray science

Cornell Affiliated Author(s)

Author

J. Becker
M.W. Tate
K.S. Shanks
H.T. Philipp
J.T. Weiss
P. Purohit
Darol Chamberlain
J.P.C. Ruff
Sol Gruner

Abstract

Pixel Array Detectors (PADs) consist of an x-ray sensor layer bonded pixel-by-pixel to an underlying readout chip. This approach allows both the sensor and the custom pixel electronics to be tailored independently to best match the x-ray imaging requirements. Here we present characterizations of CdTe sensors hybridized with two different charge-integrating readout chips, the Keck PAD and the Mixed-Mode PAD (MM-PAD), both developed previously in our laboratory. The charge-integrating architecture of each of these PADs extends the instantaneous counting rate by many orders of magnitude beyond that obtainable with photon counting architectures. The Keck PAD chip consists of rapid, 8-frame, in-pixel storage elements with framing periods < 150 ns. The second detector, the MM-PAD, has an extended dynamic range by utilizing an in-pixel overflow counter coupled with charge removal circuitry activated at each overflow. This allows the recording of signals from the single-photon level to tens of millions of x-rays/pixel/frame while framing at 1 kHz. Both detector chips consist of a 128 × 128 pixel array with (150 μm)2 pixels. © 2016 IOP Publishing Ltd and Sissa Medialab srl.

Date Published

Journal

Journal of Instrumentation

Volume

11

Issue

12

URL

https://www.scopus.com/inward/record.uri?eid=2-s2.0-85008224744&doi=10.1088%2f1748-0221%2f11%2f12%2fP12013&partnerID=40&md5=cf015fde0c86c903710464d50ce3a77f

DOI

10.1088/1748-0221/11/12/P12013

Group (Lab)

Sol M. Gruner Group

Funding Source

DMR-1332208
DE-FG02-1-0ER46693
DE-SC0016035
1332208

Download citation