Effect of Thermal Donors Induced in Bulk and Variation in P-stop Dose on the No-gain Region Width Measurements of LGADs

Shudhashil Bharthuar; Jennifer Ott; Erik Brücken; Akiko Gädda; Stefanie Kirschenmann; Maria Golovleva; Panja Luukka

doi:10.7566/JPSCP.34.010020

Effect of Thermal Donors Induced in Bulk and Variation in P-stop Dose on the No-gain Region Width Measurements of LGADs

Shudhashil Bharthuar, Jennifer Ott, Erik Brücken, Akiko Gädda, Stefanie Kirschenmann, Maria Golovleva, Panja Luukka

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

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Abstract

To cope up with high pile-up rates during Phase-2 operation of the LHC, the CMS experiment will install a precision Minimum Ionising Particle Timing Detector (MTD), between the tracker and calorimeter, which will have a timing resolution of ∼30 ps. The endcap part of the MTD, called the Endcap Timing Layer (ETL), will be based on Low-Gain Avalanche Detector (LGAD) Technology.

In this paper, the authors have performed a study on UFSD3.1 LGAD production from Fondazione Bruno Kessler (FBK). The objective of this production was to optimise the interplay between the p-stop dose and the inter-pad terminal strategy. Results show that the nominal no-gain region width value between pads does not affect the breakdown voltage of the sensors at low p-stop doses. A comparative study on the effect of thermal donors induced in the bulk of the sensor was performed by capacitance versus voltage measurements. Further, the property of the sensors were investigated using infra-red (IR) laser, by performing voltage scans and inter-pad profile measurements with gain variation, on changing temperature in Transient Current Technique (TCT). Results show no significant change in the charge collection efficiency and measured no-gain region width values of sensors irrespective of the nature of the bulk.

Original language	English
Title of host publication	Proceedings of the 29th International Workshop on Vertex Detectors, VERTEX 2020
Place of Publication	Tokyo
Publisher	Physical Society of Japan
Number of pages	9
ISBN (Electronic)	978-4-89027-147-4
DOIs	https://doi.org/10.7566/JPSCP.34.010020
Publication status	Published - 10 Jun 2021
MoE publication type	A4 Conference publication
Event	International Workshop on Vertex Detectors - Virtual, online, Tsukuba, Japan Duration: 5 Oct 2020 → 8 Oct 2020 Conference number: 29

Publication series

Name	JPS Conference Proceedings
Publisher	Physical Society of Japan
Volume	34
ISSN (Electronic)	2435-3892

Workshop

Workshop	International Workshop on Vertex Detectors
Abbreviated title	VERTEX
Country/Territory	Japan
City	Tsukuba
Period	05/10/2020 → 08/10/2020

Keywords

LGAD
TCT
thermal donors
p-stop

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Bharthuar_Eﬀect_Thermal_Donors_JPSCoProcFinal published version, 4.22 MBLicence: CC BY

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Bharthuar, S., Ott, J., Brücken, E., Gädda, A., Kirschenmann, S., Golovleva, M., & Luukka, P. (2021). Effect of Thermal Donors Induced in Bulk and Variation in P-stop Dose on the No-gain Region Width Measurements of LGADs. In Proceedings of the 29th International Workshop on Vertex Detectors, VERTEX 2020 (JPS Conference Proceedings; Vol. 34). Physical Society of Japan. https://doi.org/10.7566/JPSCP.34.010020

@inproceedings{fd81a258ac284c0793244fa17560818c,

title = "Effect of Thermal Donors Induced in Bulk and Variation in P-stop Dose on the No-gain Region Width Measurements of LGADs",

abstract = "To cope up with high pile-up rates during Phase-2 operation of the LHC, the CMS experiment will install a precision Minimum Ionising Particle Timing Detector (MTD), between the tracker and calorimeter, which will have a timing resolution of ∼30 ps. The endcap part of the MTD, called the Endcap Timing Layer (ETL), will be based on Low-Gain Avalanche Detector (LGAD) Technology. In this paper, the authors have performed a study on UFSD3.1 LGAD production from Fondazione Bruno Kessler (FBK). The objective of this production was to optimise the interplay between the p-stop dose and the inter-pad terminal strategy. Results show that the nominal no-gain region width value between pads does not affect the breakdown voltage of the sensors at low p-stop doses. A comparative study on the effect of thermal donors induced in the bulk of the sensor was performed by capacitance versus voltage measurements. Further, the property of the sensors were investigated using infra-red (IR) laser, by performing voltage scans and inter-pad profile measurements with gain variation, on changing temperature in Transient Current Technique (TCT). Results show no significant change in the charge collection efficiency and measured no-gain region width values of sensors irrespective of the nature of the bulk.",

keywords = "LGAD, TCT, thermal donors, p-stop",

author = "Shudhashil Bharthuar and Jennifer Ott and Erik Br{\"u}cken and Akiko G{\"a}dda and Stefanie Kirschenmann and Maria Golovleva and Panja Luukka",

year = "2021",

month = jun,

day = "10",

doi = "10.7566/JPSCP.34.010020",

language = "English",

series = "JPS Conference Proceedings",

publisher = "Physical Society of Japan",

booktitle = "Proceedings of the 29th International Workshop on Vertex Detectors, VERTEX 2020",

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Bharthuar, S, Ott, J, Brücken, E, Gädda, A, Kirschenmann, S, Golovleva, M & Luukka, P 2021, Effect of Thermal Donors Induced in Bulk and Variation in P-stop Dose on the No-gain Region Width Measurements of LGADs. in Proceedings of the 29th International Workshop on Vertex Detectors, VERTEX 2020. JPS Conference Proceedings, vol. 34, Physical Society of Japan, Tokyo, International Workshop on Vertex Detectors, Tsukuba, Japan, 05/10/2020. https://doi.org/10.7566/JPSCP.34.010020

Effect of Thermal Donors Induced in Bulk and Variation in P-stop Dose on the No-gain Region Width Measurements of LGADs. / Bharthuar, Shudhashil; Ott, Jennifer; Brücken, Erik et al.
Proceedings of the 29th International Workshop on Vertex Detectors, VERTEX 2020. Tokyo: Physical Society of Japan, 2021. (JPS Conference Proceedings; Vol. 34).

Research output: Chapter in Book/Report/Conference proceeding › Conference article in proceedings › Scientific › peer-review

TY - GEN

T1 - Effect of Thermal Donors Induced in Bulk and Variation in P-stop Dose on the No-gain Region Width Measurements of LGADs

AU - Bharthuar, Shudhashil

AU - Ott, Jennifer

AU - Brücken, Erik

AU - Gädda, Akiko

AU - Kirschenmann, Stefanie

AU - Golovleva, Maria

AU - Luukka, Panja

N1 - Conference code: 29

PY - 2021/6/10

Y1 - 2021/6/10

N2 - To cope up with high pile-up rates during Phase-2 operation of the LHC, the CMS experiment will install a precision Minimum Ionising Particle Timing Detector (MTD), between the tracker and calorimeter, which will have a timing resolution of ∼30 ps. The endcap part of the MTD, called the Endcap Timing Layer (ETL), will be based on Low-Gain Avalanche Detector (LGAD) Technology. In this paper, the authors have performed a study on UFSD3.1 LGAD production from Fondazione Bruno Kessler (FBK). The objective of this production was to optimise the interplay between the p-stop dose and the inter-pad terminal strategy. Results show that the nominal no-gain region width value between pads does not affect the breakdown voltage of the sensors at low p-stop doses. A comparative study on the effect of thermal donors induced in the bulk of the sensor was performed by capacitance versus voltage measurements. Further, the property of the sensors were investigated using infra-red (IR) laser, by performing voltage scans and inter-pad profile measurements with gain variation, on changing temperature in Transient Current Technique (TCT). Results show no significant change in the charge collection efficiency and measured no-gain region width values of sensors irrespective of the nature of the bulk.

AB - To cope up with high pile-up rates during Phase-2 operation of the LHC, the CMS experiment will install a precision Minimum Ionising Particle Timing Detector (MTD), between the tracker and calorimeter, which will have a timing resolution of ∼30 ps. The endcap part of the MTD, called the Endcap Timing Layer (ETL), will be based on Low-Gain Avalanche Detector (LGAD) Technology. In this paper, the authors have performed a study on UFSD3.1 LGAD production from Fondazione Bruno Kessler (FBK). The objective of this production was to optimise the interplay between the p-stop dose and the inter-pad terminal strategy. Results show that the nominal no-gain region width value between pads does not affect the breakdown voltage of the sensors at low p-stop doses. A comparative study on the effect of thermal donors induced in the bulk of the sensor was performed by capacitance versus voltage measurements. Further, the property of the sensors were investigated using infra-red (IR) laser, by performing voltage scans and inter-pad profile measurements with gain variation, on changing temperature in Transient Current Technique (TCT). Results show no significant change in the charge collection efficiency and measured no-gain region width values of sensors irrespective of the nature of the bulk.

KW - LGAD

KW - TCT

KW - thermal donors

KW - p-stop

U2 - 10.7566/JPSCP.34.010020

DO - 10.7566/JPSCP.34.010020

M3 - Conference article in proceedings

T3 - JPS Conference Proceedings

BT - Proceedings of the 29th International Workshop on Vertex Detectors, VERTEX 2020

PB - Physical Society of Japan

CY - Tokyo

T2 - International Workshop on Vertex Detectors

Y2 - 5 October 2020 through 8 October 2020

ER -

Bharthuar S, Ott J, Brücken E, Gädda A, Kirschenmann S, Golovleva M et al. Effect of Thermal Donors Induced in Bulk and Variation in P-stop Dose on the No-gain Region Width Measurements of LGADs. In Proceedings of the 29th International Workshop on Vertex Detectors, VERTEX 2020. Tokyo: Physical Society of Japan. 2021. (JPS Conference Proceedings). doi: 10.7566/JPSCP.34.010020

Effect of Thermal Donors Induced in Bulk and Variation in P-stop Dose on the No-gain Region Width Measurements of LGADs

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