Impact of neutron irradiation on LGADs with a carbon-enriched shallow multiplication layer: Degradation of timing performance and gain
In this radiation tolerance study, Low Gain Avalanche Detectors (LGADs) with a carbon-enriched broad and shallow multiplication layer were examined in comparison to identical non-carbonated LGADs. Manufactured at IMB-CNM, the sensors underwent neutron irradiation at the TRIGA reactor in Ljubljana, reaching a fluence of 1.5 × 10 15 n eq cm −2 . The results revealed a smaller deactivation of boron and improved resistance to radiation in carbonated LGADs. The study demonstrated the potential benefits of carbon enrichment in mitigating radiation damage effects, particularly the acceptor removal mechanism, reducing the acceptor removal constant by more than a factor of two. Additionally, time resolution and collected charge degradation due to irradiation were observed, with carbonated samples exhibiting better radiation tolerance. A noise analysis focused on baseline noise and spurious pulses showed the presence of thermal-generated dark counts attributed to a too narrow distance between the gain layer end and the p-stop implant at the periphery of the pad for the characterized LGAD design; however, without significant impact of operation performance.
Authors
- J. González (ORCID: https://orcid.org/0000-0002-0381-6393)
- Jairo Villegas (ORCID: https://orcid.org/0000-0001-9436-2149)
- C Quintana (ORCID: https://orcid.org/0000-0002-3583-4828)
- Efren Navarrete Ramos (ORCID: https://orcid.org/0000-0002-5180-4020)
- M. Moll (ORCID: https://orcid.org/0000-0001-7013-9751)
- A. K. Sikdar (ORCID: https://orcid.org/0000-0002-5437-5217)
- S. Hidalgo (ORCID: https://orcid.org/0000-0002-8070-3499)
- I. Vila (ORCID: https://orcid.org/0000-0002-6797-7209)
- M. Fernández (ORCID: https://orcid.org/0000-0002-4824-1087)
- R. Jaramillo (ORCID: https://orcid.org/0000-0003-3563-1358)
- P. Martínez Ruiz del Árbol (ORCID: https://orcid.org/0000-0002-7737-5121)
- G. Gómez (ORCID: https://orcid.org/0000-0002-1077-6553)
- J. Duarte Campderros (ORCID: https://orcid.org/0000-0003-0687-5214)
Institutions
- Indian Institute of Technology Madras (IN)
- Instituto de Física de Cantabria (ES)
- Institut de Microelectrònica de Barcelona (ES)
- European Organization for Nuclear Research (CH)
Publication Details
- Journal
- Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment
- Published
- 2025-02-15
- DOI
- https://doi.org/10.1016/j.nima.2025.170309
- Primary Topic
- Particle Detector Development and Performance
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- CERN
- European Commission
- Ministerio de Ciencia e Innovación
- European Regional Development Fund
- Agencia Estatal de Investigación