Heidelberg 2022 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 94: Silicon Strip Detectors 2
T 94.2: Vortrag
Donnerstag, 24. März 2022, 16:30–16:45, T-H25
Humidity Studies on ATLAS ITk sensors — Naim Bora Atlay2, Ingo Bloch1, Heiko Lacker2, •Ilona Stefana Ninca1, and Christian Scharf2 — 1Deutsches Elektronen-Synchrotron (DESY), Zeuthen, Germany — 2Humboldt-Universität zu Berlin, Berlin, Germany
This study aims to investigate electrical breakdown in the periphery of silicon sensors, with a focus on humid conditions. The study will take advantage of the large number of silicon strip sensors produced for the ATLAS Upgrade in order to probe their behavior. The sensors are investigated using the transient current technique (TCT). The TCT setup available at Deutsches Elektronen-Synchrotron in Zeuthen employs both red and infrared laser light. This setup can be used to study the transport of free charge carriers in the sensors at the surface and inside the bulk. Additionally, to better understand the electric properties of the sensors, simulations using Technology Computer Aided Design were produced. ATLAS ITk silicon miniature diodes were investigated in a humid environment. We are planning to use a dedicated camera to localize the critical spots where breakdown occurs on the surface of the diodes through luminescence of hot carriers. Using the information provided by the TCT measurements, the humidity dependence of the electric field at the breakdown point is planned to be studied. Understanding these dependencies will help us propose better geometries for future sensors and potentially allow us to develop improved operation scenarios for the future ATLAS ITk strips detector.