Low Gain Avalanche Detectors (LGAD) for particle physics and synchrotron applications

Moffat, N., Bates, R., Bullough, M., Flores, L., Maneuski, D., Simon, L., Tartoni, N., Doherty, F. and Ashby, J. (2018) Low Gain Avalanche Detectors (LGAD) for particle physics and synchrotron applications. Journal of Instrumentation, 13, C03014. (doi: 10.1088/1748-0221/13/03/C03014)

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Abstract

A new avalanche silicon detector concept is introduced with a low gain in the region of ten, known as a Low Gain Avalanche Detector, LGAD. The detector's characteristics are simulated via a full process simulation to obtain the required doping profiles which demonstrate the desired operational characteristics of high breakdown voltage (500 V) and a gain of 10 at 200 V reverse bias for X-ray detection. The first low gain avalanche detectors fabricated by Micron Semiconductor Ltd are presented. The doping profiles of the multiplication junctions were measured with SIMS and reproduced by simulating the full fabrication process which enabled further development of the manufacturing process. The detectors are 300 μm thick p-type silicon with a resistivity of 8.5 kΩcm, which fully depletes at 116 V. The current characteristics are presented and demonstrate breakdown voltages in excess of 500 V and a current density of 40 to 100 nAcm−2 before breakdown measured at 20oC. The gain of the LGAD has been measured with a red laser (660 nm) and shown to be between 9 and 12 for an external bias voltage range from 150 V to 300 V.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Ashby, Mr Joe and Maneuski, Dr Dima and Flores, Ms Leyre and Bates, Dr Richard and MOFFAT, NEIL and Doherty, Mr Frederick
Authors: Moffat, N., Bates, R., Bullough, M., Flores, L., Maneuski, D., Simon, L., Tartoni, N., Doherty, F., and Ashby, J.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Journal of Instrumentation
Publisher:IOP Publishing
ISSN:1748-0221
ISSN (Online):1748-0221
Copyright Holders:Copyright © 2018 The Authors
First Published:First published in Journal of Instrumentation 13:C03014
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
677081Low Gain Pixellated Avalanche detectors for particle physics and synchrotron applicationsRichard BatesScience & Technology Facilities Council (STFC)ST/M003337/1S&E P&A - PHYSICS & ASTRONOMY