Speaker
Constantin Weisser
(University of Manchester (GB))
Description
Passive $100 \times 100 \,\mu$m test diodes in an unirradiated and an $1 \times 10^{15} Neq \,{cm}^{-2}$ irradiated HV2FEI4v3 HV-CMOS silicon sensor were analysed using the edge TCT technique. The observed signal had fast and slow contributions, that were interpreted as drift and diffusion. The former peaked in a region, that was interpreted as the depletion region, while the latter peaked further in the bulk material. Raising the bias voltage increased the depth of the former region, while pushing the latter region further into the bulk. The irradiated sample lost signal strength mainly in its slow part compared to the unirradiated sample, while its quick signal remained largely unaffected. As only the signal interpreted as drift is fast enough to be useful in LHC operation the investigated sensors could be considered radiation hard for this purpose. This gives further promise to the HV CMOS technology for high energy physics applications.
Primary authors
Constantin Weisser
(University of Manchester (GB))
Daniel Muenstermann
(Universite de Geneve (CH))
Marcos Fernandez Garcia
(Universidad de Cantabria (ES))
