Sensors (Mar 2023)

Inverse LGAD (iLGAD) Periphery Optimization for Surface Damage Irradiation

  • Albert Doblas,
  • David Flores,
  • Salvador Hidalgo,
  • Neil Moffat,
  • Giulio Pellegrini,
  • David Quirion,
  • Jairo Villegas,
  • Dzmitry Maneuski,
  • Marie Ruat,
  • Pablo Fajardo

DOI
https://doi.org/10.3390/s23073450
Journal volume & issue
Vol. 23, no. 7
p. 3450

Abstract

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Pixelated LGADs have been established as the baseline technology for timing detectors for the High Granularity Timing Detector (HGTD) and the Endcap Timing Layer (ETL) of the ATLAS and CMS experiments, respectively. The drawback of segmenting an LGAD is the non-gain area present between pixels and the consequent reduction in the fill factor. To overcome this issue, the inverse LGAD (iLGAD) technology has been proposed by IMB-CNM to enhance the fill factor and provide excellent tracking capabilities. In this work, we explore the use of iLGAD sensors for surface damage irradiation by developing a new generation of iLGADs, the periphery of which is optimized to improve the performance of irradiated sensors. The fabricated iLGAD sensors exhibit good electrical performances before and after X-ray irradiation.

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