The influence of pixel cell layout on the timing performance of 3D sensors
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arXiv
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866913884599746560 |
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| author | Lasaosa, Clara Fernández, Marcos Vila, Iván Duarte-Campderros, Jordi Gómez, Gervasio Hidalgo, Salvador Pellegrini, Giulio |
| author_facet | Lasaosa, Clara Fernández, Marcos Vila, Iván Duarte-Campderros, Jordi Gómez, Gervasio Hidalgo, Salvador Pellegrini, Giulio |
| contents | Three-dimensional (3D) pixel sensors are a promising technology for implementing the 4D-tracking paradigm in high-radiation environments. Despite their advantages in radiation tolerance, 3D pixel sensors exhibit non-uniform electric and weighting fields that can degrade timing performance. This study explores the impact of pixel cell geometry on the timing characteristics of 3D columnar-electrode sensors fabricated by IMB-CNM, comparing square and hexagonal layouts. The sensors were characterized using the Two-Photon Absorption Transient Current Technique (TPA-TCT), providing high-resolution three-dimensional maps of the Time-of-Arrival (ToA) of charge carriers. Measurements at multiple depths and bias voltages reveal that the square geometry yields a more uniform temporal response compared to the hexagonal configuration. Additionally, a novel TPA-TCT-based method was introduced to determine the sensor jitter, relying on the analysis of the time difference between consecutive pulses in the TPA-TCT pulse train acquired under identical conditions. These findings underline the importance of pixel design optimization for future 4D-tracking detectors and confirm the TPA-TCT method as a powerful tool for detailed timing characterization. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_12857 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The influence of pixel cell layout on the timing performance of 3D sensors Lasaosa, Clara Fernández, Marcos Vila, Iván Duarte-Campderros, Jordi Gómez, Gervasio Hidalgo, Salvador Pellegrini, Giulio Instrumentation and Detectors High Energy Physics - Experiment Three-dimensional (3D) pixel sensors are a promising technology for implementing the 4D-tracking paradigm in high-radiation environments. Despite their advantages in radiation tolerance, 3D pixel sensors exhibit non-uniform electric and weighting fields that can degrade timing performance. This study explores the impact of pixel cell geometry on the timing characteristics of 3D columnar-electrode sensors fabricated by IMB-CNM, comparing square and hexagonal layouts. The sensors were characterized using the Two-Photon Absorption Transient Current Technique (TPA-TCT), providing high-resolution three-dimensional maps of the Time-of-Arrival (ToA) of charge carriers. Measurements at multiple depths and bias voltages reveal that the square geometry yields a more uniform temporal response compared to the hexagonal configuration. Additionally, a novel TPA-TCT-based method was introduced to determine the sensor jitter, relying on the analysis of the time difference between consecutive pulses in the TPA-TCT pulse train acquired under identical conditions. These findings underline the importance of pixel design optimization for future 4D-tracking detectors and confirm the TPA-TCT method as a powerful tool for detailed timing characterization. |
| title | The influence of pixel cell layout on the timing performance of 3D sensors |
| topic | Instrumentation and Detectors High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2505.12857 |