Study of radiation damage in silicon detectors for high ... - F9
Study of radiation damage in silicon detectors for high ... - F9
Study of radiation damage in silicon detectors for high ... - F9
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Contents1. Introduction 52. Operation and Radiation Damage <strong>of</strong> Silicon Detectors 112.1 Basics <strong>of</strong> Operation <strong>of</strong> Silicon Detectors . . . . . . . . . . . . . . . . . . . . 112.1.1 p ; n Junction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122.1.2 Inuence <strong>of</strong> External Voltage . . . . . . . . . . . . . . . . . . . . . 152.1.3 The Fermi Level . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162.1.4 Diusion Current from the Neutral Bulk . . . . . . . . . . . . . . . 172.1.5 Generation Current <strong>in</strong> Depleted Region . . . . . . . . . . . . . . . . 192.1.6 N eff from C/V Measurements . . . . . . . . . . . . . . . . . . . . . 222.2 Radiation Induced Defects . . . . . . . . . . . . . . . . . . . . . . . . . . . 242.2.1 Defect Generation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 242.2.2 Compar<strong>in</strong>g Radiation Damage Measurements . . . . . . . . . . . . 252.2.3 Types <strong>of</strong> Defects . . . . . . . . . . . . . . . . . . . . . . . . . . . . 272.3 Eects on Bulk Properties . . . . . . . . . . . . . . . . . . . . . . . . . . . 272.3.1 Leakage Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . 282.3.2 Eective Dopant Concentration . . . . . . . . . . . . . . . . . . . . 292.3.3 Charge Collection Eciency . . . . . . . . . . . . . . . . . . . . . . 312.4 Time Evolution <strong>of</strong> Defects . . . . . . . . . . . . . . . . . . . . . . . . . . . 312.4.1 Time Evolution <strong>of</strong> Leakage Current . . . . . . . . . . . . . . . . . . 332.4.2 Time Evolution <strong>of</strong> N eff . . . . . . . . . . . . . . . . . . . . . . . . . 343. Ir<strong>radiation</strong> Facility 353.1 The Reactor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 353.2 Selection <strong>of</strong> Ir<strong>radiation</strong> Site . . . . . . . . . . . . . . . . . . . . . . . . . . 353.3 Ir<strong>radiation</strong> Chamber . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 373.3.1 Channel Description . . . . . . . . . . . . . . . . . . . . . . . . . . 373.3.2 Measurement Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . 373.3.3 Neutron Spectrum and Dosimetry . . . . . . . . . . . . . . . . . . . 383.4 Ir<strong>radiation</strong> Channel F19 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 413.4.1 Channel Description . . . . . . . . . . . . . . . . . . . . . . . . . . 413.4.2 Neutron Spectrum and Dosimetry . . . . . . . . . . . . . . . . . . . 421