Speaker
Description
The MONOLITH H2020 ERC Advanced project aims at producing a high-granularity monolithic silicon pixel detector with picosecond-level time stamping. Such extreme timing exploits fast and low-noise SiGe BiCMOS electronics, and a novel sensor concept: the Picosecond Avalanche Detector (PicoAD).
A prototype without internal gain layer and 100µm pixel pitch was produced in 2022.
Lab measurements with a femtosecond laser provided time resolutions down to 2.5 ps. Testbeam measurements showed full efficiency and 20 ps time resolution at a power consumption of 1 W/cm^2 and a sensor bias voltage HV = 200 V. This prototype after being irradiated up to 1x10^16 neq/cm2, still provides an efficiency of 99.7% and 45 ps at HV = 300 V.
The novel PicoAD sensor uses a patented multi-PN junction to engineer the electric field and produce a continuous gain layer deep in the sensor volume. The result is an ultra-fast current signal with low intrinsic jitter in a full fill factor sensor. A proof-of-concept monolithic PicoAD demonstrator provided full efficiency and 13 ps at the center of the pixel, while the time resolution raised to 25 ps in the inter-pixel region. The first batch of PicoAD prototypes with different geometries and gain-layer implant doses was delivered in January 2024; preliminary results will be shown.
