SMuK 2023 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 20: Pixel ITk, Si-Strips/Other

T 20.5: Vortrag

Montag, 20. März 2023, 17:30–17:45, REC/C213

Humidity Studies on Silicon Strip Sensors — •Ilona-Stefana Ninca — Deutsches Elektronen-Synchrotron (DESY), Zeuthen, Germany

Silicon strip sensors for the ATLAS Upgrade showed a strong dependence of the breakdown voltage on varying levels of relative humidity. This study aims to investigate the same behavior on test structures that are produced on "half moons" of the same wafers as the sensors. The test structures are first imaged in breakdown conditions: high bias voltage and 20% - 50% relative humidity. Using an infrared camera the location of the avalanche breakdown on the surface of the test structures was captured. Afterwards, the test structures are investigated using the transient current technique (TCT). The region of the avalanche breakdown is investigated in the TCT setup by scanning a focused, pulsed 660 nm laser beam along the surface of the test structure and recording the resulting current transients. Using the TCT data, the electric field at the breakdown point can be estimated. In the future, hopefully with a better understanding of the origin of the humidity sensitivity we wish to be able to propose changes for new sensors reducing the humidity impact.