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A Comprehensive Characterization of the TI-LGAD Technology
Matias Senger1, Anna Macchiolo1, Ben Kilminster1
1Physics Institute, University of Zurich, Irchel Campus, 8057 Zurich, Switzerland.
Sensors (Basel, Switzerland)
|July 14, 2023
Summary
Trench-isolated Low-Gain Avalanche Diodes (TI-LGADs) improve the fill factor for small pixels by replacing traditional p-stop terminations with silicon trenches. This advancement is crucial for precise charged particle detection in high-energy physics.
Area of Science:
- Semiconductor device physics
- Particle detector technology
- High-energy physics instrumentation
Background:
- Pixelated Low-Gain Avalanche Diodes (LGADs) offer precise spatial and temporal measurements for charged particle detection.
- Traditional LGAD designs suffer from a reduced active area (fill factor) due to electrical termination regions, limiting small pixel applications.
Purpose of the Study:
- To present a systematic characterization of the TI-RD50 production, the first dedicated to Trench-Isolated LGAD (TI-LGAD) technology.
- To evaluate the effectiveness of TI-LGADs in overcoming the fill-factor limitations of conventional LGADs.
- To compare the performance of TI-LGAD designs with regular LGADs.
Main Methods:
- Fabrication of TI-LGADs using trench isolation instead of p-stop structures.
- Systematic characterization of the TI-RD50 production run.
- Measurement and ranking of designs based on inter-pixel distance.
- Comparison of time resolution between TI-LGADs and regular LGADs.
Main Results:
- TI-LGADs substantially reduce the no-gain region, enabling smaller pixels with adequate fill factors.
- The study presents a ranking of TI-LGAD designs by measured inter-pixel distance.
- Time resolution of TI-LGADs is compared to that of regular LGADs, demonstrating competitive performance.
Conclusions:
- Trench isolation is an effective strategy to enhance the fill factor in pixelated LGADs.
- TI-LGAD technology facilitates the development of smaller, more efficient pixels for charged particle detection.
- The TI-RD50 production demonstrates the viability and potential of TI-LGADs for future detector applications.
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