Characterization of timing and spacial resolution of novel TI-LGAD structures before and after irradiation

TL;DR

This paper evaluates the spatial and timing resolution of a novel trench-isolated LGAD sensor technology designed for precise 4D particle detection, including its performance before and after irradiation.

Contribution

It introduces the first pixelated TI-LGAD sensors and characterizes their spatial and timing resolution, demonstrating potential for advanced particle tracking.

Findings

Achieved high spatial resolution with TI-LGADs

Demonstrated precise timing capabilities for MIPs

Assessed performance stability post-irradiation

Abstract

The characterization of spacial and timing resolution of the novel Trench Isolated LGAD (TI-LGAD) technology is presented. This technology has been developed at FBK with the goal of achieving 4D pixels, where an accurate position resolution is combined in a single device with the precise timing determination for Minimum Ionizing Particles (MIPs). In the TI-LGAD technology, the pixelated LGAD pads are separated by physical trenches etched in the silicon. This technology can reduce the interpixel dead area, mitigating the fill factor problem. The TI-RD50 production studied in this work is the first one of pixelated TI-LGADs. The characterization was performed using a scanning TCT setup with an infrared laser and a $^{90}$Sr source setup.