Speaker
Mr
Marco Povoli
(Università di Trento/INFN)
Description
In the framework of our R&D activities oriented to 3D detectors, which finally led to the first production for the ATLAS Insertable B layer, we have also developed planar sensors with active edge. First proposed by C. Kenney et al., this type of edge termination consists of a deep trench etched all around the active area and doped as an ohmic electrode. One batch of these devices was fabricated at Fondazione Bruno Kessler, Trento, Italy, and was split into two parts. From the characterization of the first part, it was possible to understand some critical features and to improve the fabrication process, so that devices from the second part had better defined trenches and good electrical characteristics in terms of breakdown voltage. At the conference we will report on the functional characterization of test diodes with active-edges performed by means of 1060nm laser scans carried out in our lab and by means of 15keV X-Ray beam scans carried out at the Diamond light source, UK. Measurements were performed on devices featuring different distances between the active area and the trench. Thanks to these measurements it was possible to investigate the effects of the bias voltage on the signal efficiency of the edge region (in particular the corner region) with different radiation sources and to demonstrate that devices work as expected. Preliminary results are very promising showing a full efficiency of the devices just ~20μm away from the physical edge.
Primary author
Mr
Marco Povoli
(Università di Trento/INFN)
Co-authors
Dr
Alexander Oh
(The University of Manchester, Oxford Road, Manchester M13 9PL, UK)
Dr
Alvise Bagolini
(Fondazione Bruno Kessler, Via Sommarive, 18, 38123 Trento, Italy)
Prof.
Gian-Franco Dalla Betta
(Università di Trento and INFN Trento, Via Sommarive, 14, 38123 Trento, Italy)
Dr
Jasmine Hasi
(SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025-7015)
Dr
Maurizio Boscardin
(Fondazione Bruno Kessler, Via Sommarive, 18, 38123 Trento, Italy)
Dr
Nicola Zorzi
(Fondazione Bruno Kessler, Via Sommarive, 18, 38123 Trento, Italy)
