Hamburg 2016 – scientific programme

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T: Fachverband Teilchenphysik

T 53: Halbleiterdetektoren III (Strahlenhärte)

T 53.5: Talk

Tuesday, March 1, 2016, 17:45–18:00, VMP8 HS

TSC measurements on proton-irradiated p-type Si-sensors — •Elena Donegani, Eckhart Fretwurst, Erika Garutti, and Alexandra Junkes — University of Hamburg

Thin n⁺p Si sensors are potential candidates for coping with neutron equivalent fluences up to 2·10¹⁶ n_eq/cm² and an ionizing dose in the order of a few MGy, which are expected e.g. for the HL-LHC upgrade. The aim of the present work is to provide experimental data on radiation-induced defects in order to: firstly, get a deeper understanding of the properties of hadron induced defects, and secondly develop a radiation damage model based on microscopic measurements.

Therefore, the outcomes of Thermally Stimulated Current measurements on 200 µm thick Float-Zone (FZ) and Magnetic Czochralski (MCz) diodes will be shown, as a results of irradiation with 23 MeV protons and isothermal annealing. The samples were irradiated in the fluence range (0.3-1)·10¹⁴ n_eq/cm², so that the maximal temperature at which the TSC signal is still sharply distinguishable from the dark current is 200 K.

In particular, special focus will be given to the defect introduction rate and to the issue of boron removal in p-type silicon. Annealing studies allow to distinguish which defects mainly contribute to the leakage current and which to the space charge, and thus correlate microscopic defects properties with macroscopic sensor properties.