Soft-X-ray CCD imagers for AXAF
Soft-X-ray CCD imagers for AXAF
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用于 AXAF 的软 X 射线 CCD 成像仪
DOI:
10.1109/16.628815
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发表时间:
1997
期刊:
影响因子:
--
通讯作者:
D. Young
中科院分区:
文献类型:
--
作者:
B. Burke;J. A. Gregory;M. Bautz;G. Prigozhin;S. Kissel;B. Kosicki;A. Loomis;D. Young
We describe the key features and performance data of a 1024/spl times/1026-pixel frame-transfer imager for use as a soft-X-ray detector on the NASA X-ray observatory Advanced X-ray Astrophysics Facility (AXAF). The four-port device features a floating-diffusion output circuit with a responsivity of 20 /spl mu/V/e/sup -/ and noise of about 2 e/sup -/ at a 100-kHz data rate. Techniques for achieving the low sense-node capacitance of 5 fF are described. The CCD is fabricated on high-resistivity p-type silicon for deep depletion and includes narrow potential troughs for transfer inefficiencies of around 10/sup -7/. To achieve good sensitivity at energies below 1 keV, we have developed a back-illumination process that features low recombination losses at the back surface and has produced quantum efficiencies of about 0.7 at 277 eV (carbon K/spl alpha/).