Investigating irradiation effects and space charge sign inversion in n-type Low Gain Avalanche Detectors
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arXiv
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| Auteurs principaux: | , , , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866913939557711872 |
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| author | Kraus, Veronika Biveinytė, Margarita Garcia, Marcos Fernandez Hidalgo, Salvador Moll, Michael Villegas, Jairo Wiehe, Moritz |
| author_facet | Kraus, Veronika Biveinytė, Margarita Garcia, Marcos Fernandez Hidalgo, Salvador Moll, Michael Villegas, Jairo Wiehe, Moritz |
| contents | Low Gain Avalanche Detectors built on n-type substrate (nLGADs) have been developed by IMB-CNM to enhance the detection of low-penetrating particles, with a wide range of applications from medicine, industry to synergies with developments for high-energy physics (HEP). In this work, irradiation effects on nLGADs were investigated through proton irradiation at the CERN PS-IRRAD facility up to proton fluences of $10^{14}\,\mathrm{cm}^{-2}$. Electrical characterization before and after irradiation reveals space charge sign inversion of the n-type bulk, leading to significant modifications in the depletion behavior and electric field distribution. Utilizing UV TCT and TPA-TCT measurements, the impact of irradiation on the electric fields and the gain are studied in more detail, confirming a change of sensor depletion and a reduced electric field in the gain layer. The results suggest that donor removal in nLGADs is stronger pronounced already at lower fluences compared to acceptor removal in traditional p-type LGADs. These findings provide not only first insights into the effects of irradiation on nLGADs but also contribute to the development of methods to quantify the donor removal. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_03462 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Investigating irradiation effects and space charge sign inversion in n-type Low Gain Avalanche Detectors Kraus, Veronika Biveinytė, Margarita Garcia, Marcos Fernandez Hidalgo, Salvador Moll, Michael Villegas, Jairo Wiehe, Moritz Instrumentation and Detectors Low Gain Avalanche Detectors built on n-type substrate (nLGADs) have been developed by IMB-CNM to enhance the detection of low-penetrating particles, with a wide range of applications from medicine, industry to synergies with developments for high-energy physics (HEP). In this work, irradiation effects on nLGADs were investigated through proton irradiation at the CERN PS-IRRAD facility up to proton fluences of $10^{14}\,\mathrm{cm}^{-2}$. Electrical characterization before and after irradiation reveals space charge sign inversion of the n-type bulk, leading to significant modifications in the depletion behavior and electric field distribution. Utilizing UV TCT and TPA-TCT measurements, the impact of irradiation on the electric fields and the gain are studied in more detail, confirming a change of sensor depletion and a reduced electric field in the gain layer. The results suggest that donor removal in nLGADs is stronger pronounced already at lower fluences compared to acceptor removal in traditional p-type LGADs. These findings provide not only first insights into the effects of irradiation on nLGADs but also contribute to the development of methods to quantify the donor removal. |
| title | Investigating irradiation effects and space charge sign inversion in n-type Low Gain Avalanche Detectors |
| topic | Instrumentation and Detectors |
| url | https://arxiv.org/abs/2504.03462 |