# Development and simulations of Enhanced Lateral Drift Sensors

## TL;DR

This paper introduces the ELAD sensor, a silicon tracking device with enhanced spatial resolution achieved through a novel charge sharing mechanism enabled by a non-homogeneous electric field created by buried doping implants, supported by detailed simulations.

## Contribution

The paper presents the concept, design, and simulation results of the new ELAD sensor with optimized electric field profiles for improved impact position resolution.

## Key findings

- Charge sharing depends strongly on buried implant concentration.
- Optimal implant concentrations enable nearly linear charge sharing.
- Simulations demonstrate improved position interpolation capabilities.

## Abstract

We present the concept of a new type of silicon tracking sensor called Enhanced Lateral Drift (ELAD) sensor. In ELAD sensors the spatial resolution of the impact position of ionising particles is improved by a dedicated charge sharing mechanism, which is achieved by a non-homogeneous electric field in the lateral direction in the sensor bulk. The non-homogeneous electric field is created by buried doping implants with a higher concentration with respect to the background concentration of the bulk. The resulting position-dependent charge sharing allows for an improved interpolation of the impact position. TCAD-based electric field simulations for 2D and 3D geometries as well as transient simulations with a traversing particle for the 2D geometry have been carried out. The electric field profiles have further been optimised for position resolution. The simulations show a strong dependence of the charge sharing mechanism on the buried implant concentration. Optimal values for the buried implant concentration allow for nearly linear charge sharing between two readout electrodes as a function of the impact position. Additionally, the foreseen production technique combining silicon epitaxy and ion beam implantation is outlined.