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Evaluation of junction termination for silicon X-ray detectors
Acreo AB, Kista, Sweden.
KTH, School of Engineering Sciences (SCI), Applied Physics, Biomedical and X-ray Physics.
Silex Microsyst AB, Järfälla, Sweden.
Sectra Imtec AB, Solna, Sweden.
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2011 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 648, S68-S71 p.Article in journal (Refereed) Published
Abstract [en]

Junction terminations intended for silicon strip X-ray detectors were evaluated experimentally and with simulations, with respect to their tolerance to radiation-induced surface charge. The terminations were designed with an inner guard ring biased to the same potential as the active anode and multiple p+-doped rings with metallic field plates at floating potential. Two designs, one with 9 and one with 14 floating rings were evaluated and applied to simple non-segmented test diodes. The test diodes were irradiated with X-rays to 72-74 kGy, the surface charge was determined from capaciatance-voltage measurements, and reverse breakdown voltage was determined from I-V-curves. Both simulations and experiments showed superior performance of the 14-ring design. The experimentally determined surface charge density after irradiation was in the order of +5 x 10(11) cm(-2), and the breakdown voltages were similar to 900 and 1600 V for the 9-ring and 14-ring termination, respectively.

Place, publisher, year, edition, pages
2011. Vol. 648, S68-S71 p.
Keyword [en]
Junction termination, Floating ring, Field plate, Surface charge, X-ray detector
National Category
Medical Biotechnology
Identifiers
URN: urn:nbn:se:kth:diva-99118DOI: 10.1016/j.nima.2010.12.152ISI: 000305376900019Scopus ID: 2-s2.0-79960843858OAI: oai:DiVA.org:kth-99118DiVA: diva2:541279
Note

QC 20120716

Available from: 2012-07-16 Created: 2012-07-13 Last updated: 2017-12-07Bibliographically approved

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