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Title: Fabrication and performance of AC-coupled LGADs

Abstract

Detectors that can simultaneously provide fine time and spatial resolution have attracted wide-spread interest for applications in several fields such as high-energy and nuclear physics as well as in low-energy electron detection, photon science, photonics and imaging. Low-Gain Avalanche Diodes (LGADs), being fabricated on thin silicon substrates and featuring a charge gain of up to 100, exhibit excellent timing performance. Since pads much larger than the substrate thickness are necessary to achieve a spatially uniform multiplication, a fine pad pixelation is difficult. To overcome this limitation, the AC-coupled LGAD approach was introduced. In this type of device, metal electrodes are placed over an insulator at a fine pitch, and signals are capacitively induced on these electrodes. At Brookhaven National Laboratory, we have designed and fabricated prototypes of AC-coupled LGAD sensors. The performance of small test structures with different particle beams from radioactive sources are shown.

Authors:
 [1];  [1];  [1];  [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States)
Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1571434
Report Number(s):
BNL-212212-2019-JAAM
Journal ID: ISSN 1748-0221
Grant/Contract Number:  
SC0012704
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Instrumentation
Additional Journal Information:
Journal Volume: 14; Journal Issue: 09; Journal ID: ISSN 1748-0221
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; solid state detectors; timing detectors; charge transport and multiplication in solid media; detector modelling and simulations II; electric fields; charge transport; multiplication and induction; pulse formation; electron emission

Citation Formats

Giacomini, Gabriele, Chen, W., D'Amen, G., and Tricoli, A. Fabrication and performance of AC-coupled LGADs. United States: N. p., 2019. Web. doi:10.1088/1748-0221/14/09/P09004.
Giacomini, Gabriele, Chen, W., D'Amen, G., & Tricoli, A. Fabrication and performance of AC-coupled LGADs. United States. doi:10.1088/1748-0221/14/09/P09004.
Giacomini, Gabriele, Chen, W., D'Amen, G., and Tricoli, A. Mon . "Fabrication and performance of AC-coupled LGADs". United States. doi:10.1088/1748-0221/14/09/P09004.
@article{osti_1571434,
title = {Fabrication and performance of AC-coupled LGADs},
author = {Giacomini, Gabriele and Chen, W. and D'Amen, G. and Tricoli, A.},
abstractNote = {Detectors that can simultaneously provide fine time and spatial resolution have attracted wide-spread interest for applications in several fields such as high-energy and nuclear physics as well as in low-energy electron detection, photon science, photonics and imaging. Low-Gain Avalanche Diodes (LGADs), being fabricated on thin silicon substrates and featuring a charge gain of up to 100, exhibit excellent timing performance. Since pads much larger than the substrate thickness are necessary to achieve a spatially uniform multiplication, a fine pad pixelation is difficult. To overcome this limitation, the AC-coupled LGAD approach was introduced. In this type of device, metal electrodes are placed over an insulator at a fine pitch, and signals are capacitively induced on these electrodes. At Brookhaven National Laboratory, we have designed and fabricated prototypes of AC-coupled LGAD sensors. The performance of small test structures with different particle beams from radioactive sources are shown.},
doi = {10.1088/1748-0221/14/09/P09004},
journal = {Journal of Instrumentation},
number = 09,
volume = 14,
place = {United States},
year = {2019},
month = {9}
}

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