Open AccessCdZnTe Array Detectors for Synchrotron Radiation Applications
Author(s) -
Yoo S. S.,
Jennings G.,
Montano P. A.
Publication year - 1998
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049598007237
Subject(s) - full width at half maximum , detector , physics , optics , charge sharing , radiation , particle detector , synchrotron radiation , synchrotron radiation source , x ray detector , optoelectronics , materials science
An X‐ray linear‐array detector was fabricated using high‐pressure Bridgman‐grown CdZnTe. The detector area was 175 × 800 µm and the pitch size was 250 µm. The measured dark current for the test 16‐element detector was as low as 0.1 pA at 800 V cm −1 with excellent uniformity. Energy spectra were measured using a 57 Co radiation source. Both a small‐pixel effect and charge sharing were observed. For the arrays, an average 5.8% full width at half‐maximum (FWHM) at the 122 keV photopeak was obtained with a standard deviation of 0.2%. A large‐area detector (1 × 1 cm) of the same material before fabrication exhibited a low‐energy tail at the photopeak, which limits the photopeak FWHM to 8%, typically due to hole trapping. At energies below 60 keV, charge sharing between elements was observed. The charge sharing was greatly reduced by providing a path to ground for unwanted charges. A prototype readout electronic system for an eight‐channel array detector was developed. A readout system intended for a multielement solid‐state detector system was also used. The array detector will be used for high‐energy diffraction and Compton scattering measurements at the Advanced Photon Source.