2024-03-28T20:16:20Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1400212018-06-28T07:23:56Zcom_10261_37com_10261_4col_10261_290
http://hdl.handle.net/10261/140021
10.1016/j.nima.2015.08.026
319235
Impact of low-dose electron irradiation on n+p silicon strip sensors
Elsevier
2015
artículo
Klanner, R.
Jaramillo, R.
rp06811
Fernández, M.
rp06805
Gómez, G.
rp06809
Moya, David
González Sánchez, J.
rp06808
Vila, Iván
López Virto, A.
rp06882
CMS Collaboration
Surface damage
Silicon strip sensors
Radiation damage
Charge collection
2015
Under a Creative Commons license.
The Tracker Group of the CMS Collaboration.-- et al.
The response of n+p silicon strip sensors to electrons from a 90Sr source was measured using a multi-channel read-out system with 25 ns sampling time. The measurements were performed over a period of several weeks, during which the operating conditions were varied. The sensors were fabricated by Hamamatsu Photonics on 200 μm thick float-zone and magnetic-Czochralski silicon. Their pitch was 80 μm, and both p-stop and p-spray isolation of the n+ strips were studied. The electrons from the 90Sr source were collimated to a spot with a full-width-at-half-maximum of 2 mm at the sensor surface, and the dose rate in the SiO2 at the maximum was about 50 Gy(SiO2)/d. After only a few hours of making measurements, significant changes in charge collection and charge sharing were observed. Annealing studies, with temperatures up to 80 °C and annealing times of 18 h showed that the changes can only be partially annealed. The observations can be qualitatively explained by the increase of the positive oxide-charge density due to the ionization of the SiO2 by the radiation from the β source. TCAD simulations of the electric field in the sensor for different oxide-charge densities and different boundary conditions at the sensor surface support this explanation. The relevance of the measurements for the design of n+p strip sensors is discussed.
European Commission
Federal Ministry of Education and Research (Germany)
European Organization for Nuclear Research
Nuclear Instruments and Methods in Physics Research - Section A
2015
803
100
112