Speaker
Description
We have developed 3D integrated Photon-to-Digital Converters (PDC) as an improved alternative to PMTs and SiPMs for photon counting in various radiation applications, particularly for low power consumption in large area systems such as noble liquid dark matter and neutrino searches, or fast neutron spectroscopy.
In previous years we reported on the architecture, the fabrication process, the CMOS readout electronics designed for these applications, and on system integration. Fabrication of the first 3 wafers of PDC was completed at the Teledyne DALSA foundry in Oct. 2024. The SPAD show expected performances with peak sensitivity >50% at 420 nm and dark count rate (DCR) of $0.1~\text{cps}/\mu\text{m}^2$. Within a PDC, the DCR of the 4096 SPADs was characterized, showing 5% to 7% of screamer SPADs with >10$\times$ the average DCR. We will report on the PDC fabrication process, on wafer characterization, on the SPAD performance, and on the operation of the PDC showing low power and timing capability around 100 ps. We will also update on our efforts to produce large tiles of PDCs toward scale integration.
| Keyword-1 | Noble liquid experiments |
|---|---|
| Keyword-2 | Radiation instrumentation |
| Keyword-3 | Photodetectors |
