Impact of the Guard Rings on Self-Induced Signal and Leakage Current in Trench-Isolated LowGain Avalanche Diodes

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F10974938%3A_____%2F25%3A25_88_05" target="_blank" >RIV/10974938:_____/25:25_88_05 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.3390/s25103006" target="_blank" >https://doi.org/10.3390/s25103006</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/s25103006" target="_blank" >10.3390/s25103006</a>

Result language

angličtina

Original language name

Impact of the Guard Rings on Self-Induced Signal and Leakage Current in Trench-Isolated LowGain Avalanche Diodes

Original language description

In this contribution, we explored the interplay of guard ring (GR) configuration and isolation structures, as well as irradiation effects, which all together create a rich landscape of phenomena such as self-induced signals ("ghosts") in trench-isolated Low-Gain Avalanche Diodes (TI-LGADs). The ghost effect is related to the increased surface current due to presence of SiO2 trenches (and defects) in studied diodes, but it is also affected by interplay between the guard ring(s) and the n+ bias ring, implanted in inter-pixel region of these devices. In double-trenched sensors, the n+ bias ring is inserted in between the two trenches. We present the investigation on the role of these structures on the self-induced signals in trench-isolated sensors from two different productions (RD50 and AIDAinnova). The sensors from the first production have multiple guard rings, whereas the second type of devices feature only one. Detailed examination of the ghost effect and leak current was performed when guard rings were left floating or connected to the pixels (brought to the same potential). The results show that guard ring configuration in trenched sensors can be critical for the leak current and the presence of a ghost signal. To our best knowledge, the latter problem has not been investigated yet.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project

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Continuities

R - Projekt Ramcoveho programu EK

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Sensors

ISSN

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e-ISSN

1424-8220

Volume of the periodical

25

Issue of the periodical within the volume

10

Country of publishing house

CH - SWITZERLAND

Number of pages

14

Pages from-to

3006

UT code for WoS article

001496975200001

EID of the result in the Scopus database

2-s2.0-105006678761