Charge collection parameterization of MALTA2, a depleted monolithic active pixel sensor

Journal article

A fast simulation method is presented for a depleted monolithic active pixel sensor, which uses a data driven parameterization of the charge collection and propagation. This approach provides an efficient alternative to TCAD simulations, particularly for sensors whose proprietary process details — such as doping profiles or implant geometries — are unavailable. Data was obtained with a MALTA2 sensor fabricated in a 180 nm CMOS imaging technology on 30 µm epitaxial silicon using the MALTA beam telescope at CERN SPS. The model reproduces the measured in-pixel efficiency with high accuracy and enables a realistic yet computationally lightweight analog pixel simulation. This method will be further employed in optimizing the digital sensor design for applications in high-rate particle tracking and high-granularity calorimetry.

Authors: Fasselt, L; Behera, P; Berlea, D; Bortoletto, D; Buttar, C

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: IOP Publishing
• Journal: Journal of Instrumentation
• Volume: 21
• Issue: 04
• Pages: C04001
• Article number: C04001
• Publication date: 2026-04-01
• Acceptance date: 2026-02-09
• DOI: 10.1088/1748-0221/21/04/c04001
• EISSN: 1748-0221
• ISSN: 1748-0221
• Language: English
• Keywords: Detector modelling and simulations II (electric fields, charge transport, multiplication and induction, pulse formation, electron emission, etc); Radiation-hard detectors; Particle tracking detectors