Gain recovery in heavily Irradiated Low Gain Avalanche Detectors by high temperature annealing

Mandić, Igor (author), Cindro, Vladimir (author), Gorišek, Andrej (author), Hiti, Bojan (author), Howard, Alissa (author), Kljun, Žan (author), Kramberger, Gregor (author), Maček Kržmanc, Marjeta (author), Mikuž, Marko (author), Novak, Brigita (author)

Studies of annealing at temperatures up to 450 °C with Low Gain Avalanche Detectors (LGAD) irradiated with neutrons are described. It was found that the performance of LGADs irradiated with 1.5e15 n/cm$^2$ was already improved at 5 min of annealing at 250 °C. Isochronal annealing for 30 min in 50 °C steps between 300 °C and 450 °C showed that the largest beneficial effect of annealing is at around 350 °C. Another set of devices was annealed for 60 min at 350 °C and this annealing significantly increased depletion voltage of the gain layer (V$_{gl}$). The effect is equivalent to reducing the effective acceptor removal constant by a factor of ∼ 4. Increase of V$_{gl}$ is the consequence of increased effective space charge in the gain layer caused by formation of electrically active defects or re-activation of interstitial boron atoms.

• Language: English
• Keywords: particle tracking detectors, radiation-hard detectors, solid state detectors, LGAD, annealing
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FMF - Faculty of Mathematics and Physics
• Publication status: Published
• Publication version: Version of Record
• Year: 2023
• Number of pages: 6 str.
• Numbering: Vol. 1055, art. 168553
• PID: 20.500.12556/RUL-153066
• UDC: 5391.
• ISSN on article: 0168-9002
• DOI: 10.1016/j.nima.2023.168553
• COBISS.SI-ID: 161709315
• Publication date in RUL: 15.12.2023

Record is a part of a journal

• Title: Nuclear instruments and methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment
• Shortened title: Nucl. instrum, methods phys res., Sect. A, Accel.
• Publisher: Elsevier
• ISSN: 0168-9002
• COBISS.SI-ID: 2289668

Licences

• License: CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
• Link: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Description: The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: P1-0135
• Name: Eksperimentalna fizika osnovnih delcev

• Funder: ARRS - Slovenian Research Agency
• Project number: J1-1699
• Name: Razvoj prostorsko občutljivega detektorja časa v eksperimentu ATLAS