Characterization of p-stop isolation implants in silicon sensors using MOSFET structures

Thomas Bergauer; Suman Chatterjee; Marko Dragicevic; Ioannis Kopsalis; Veronika Kraus

Characterization of p-stop isolation implants in silicon sensors using MOSFET structures

Instrumentation and Detectors 2026-07-06 v1 High Energy Physics - Experiment

Authors: Thomas Bergauer , Suman Chatterjee , Marko Dragicevic , Ioannis Kopsalis , Veronika Kraus

Abstract

Metal-oxide-semiconductor field-effect transistor (MOSFET) test structures are investigated to characterize p-stop isolation implants between n-type electrodes in p-type silicon sensors. The device transfer characteristics are measured as a function of the voltage applied to the backside to extract the threshold voltage, which quantifies inter-electrode isolation, and the field-dependent mobility parameters. We present a methodology to reconstruct depth-dependent doping profiles from the threshold voltage characteristics, accounting for the localized space-charge effects and electric-field screening induced by the p-stop implants. The study evaluates the sensitivity of this technique to various p-stop geometries and doping concentrations across different wafer types. The results demonstrate the potential of MOSFET-based structures as a non-destructive diagnostic for monitoring p-stop consistency and inter-electrode isolation properties in silicon detectors.

Cite

@article{arxiv.2607.05528,
  title  = {Characterization of p-stop isolation implants in silicon sensors using MOSFET structures},
  author = {Thomas Bergauer and Suman Chatterjee and Marko Dragicevic and Ioannis Kopsalis and Veronika Kraus},
  journal= {arXiv preprint arXiv:2607.05528},
  year   = {2026}
}