Charge Collection and Space Charge Distribution in Epitaxial Silicon Detectors after Neutron-Irradiation
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1 Charge Collection and Space Charge Distribution in Epitaxial Silicon Detectors after Neutron-Irradiation Thomas Pöhlsen, Julian Becker, Eckhart Fretwurst, Robert Klanner, Jörn Lange Hamburg University 16th RD50 Workshop, Barcelona, June 2010
2 Outline Introduction Transient Current Technique (TCT) Simulation of TCT current signal for unirradiated diodes Simulation of TCT current signal for irradiated diodes Electric field and space charge distribution Fit of the Charge Collection Efficiency (CCE) / Parameterisation of (E) Results Trapping time Space charge distribution Summary Thomas Pöhlsen, Charge Collection in Si Detectors 2
3 Introduction Trapping - Most limiting factor for S-LHC - Charge Collection Efficiency (CCE) decreases Aim of this work - Determination of trapping time - Taking into account the structure double peak to the electric field - Investigation of field dependence of Thomas Pöhlsen, Charge Collection in Si Detectors 3
4 Introduction Why field dependent? constant - common description for < cm -2 (FZ, MCz) - not suitable for > cm -2 (higher CCE observed, especially at high U) field or voltage dependent motivated by: - field dependent trapping cross section (E)? - field enhanced detrapping? - trap filling? Thomas Pöhlsen, Charge Collection in Si Detectors 4
5 Investigated samples Window for laser light injection Samples and irradiation n-type epitaxial silicon pad detectors thickness d: 100 µm and 150 µm area: 2.5 x 2.5 mm 2 (small) or 5 x 5 mm 2 (big) neutron fluence : to cm -2 type inversion for > Thomas Pöhlsen, Charge Collection in Si Detectors 5
6 Transient Current Technique (TCT) Front side injection (p+ side) 660 nm / 670 nm laser light (penetration depth 3 µm) electron signal Short laser pulse: FWHM ~ 40 ps Small pad diodes: C = 4.3 pf for d = 150 µm 1 GHz Oscilloscope measured rise time = 650 ps (for the small 150 µm thick diodes) Thomas Pöhlsen, Charge Collection in Si Detectors 6
7 Simulation of TCT current signal for unirradiated diodes Induced current I = v dr (E) N q 0 / d Thomas Pöhlsen, Charge Collection in Si Detectors 7
8 Circuit simulation Circuit simulation - calculated with SPICE - unirradiated diodes used for calibration data well described Thomas Pöhlsen, Charge Collection in Si Detectors 8
9 Simulation of TCT current signal for irradiated diodes I [10 4 A] double peak x [µm] U = 300 V, = cm -2 Number of drifting electrons N reduces while drifting (trapping time ) time [ns] Trapping time, space charge distribution and E-field not known Fit space charge distribution N eff and trapping time (E) Thomas Pöhlsen, Charge Collection in Si Detectors 9
10 Simulation for irradiated diodes N eff = const from U dep = 250 V (CV measurements) EPI-DO 20 C data not well described with N eff = const Thomas Pöhlsen, Charge Collection in Si Detectors 10
11 Parameterisation of space charge distribution EPI-DO 20 C N eff = cm -3 N eff = cm -3 Thomas Pöhlsen, Charge Collection in Si Detectors 11
12 Simulation for irradiated diodes _ best values for N eff, N eff were taken, U dep = 250 V EPI-DO 20 C data described with N eff linear in x Thomas Pöhlsen, Charge Collection in Si Detectors 12
13 Fit of the CCE curve Trapping model: 1 dn (E(x(t))) N dt CCE versus rev. bias voltage Different possible parameterisations of = 0 = E 1/ = 1/ 0 + 1/ 1 E 1/ = 1/ 0 + 1/ 1 v dr (E) EPI-ST 20 C - fit simulated CCE curve to the measured CCE values - free parameters: 0, 1 best parameterisation: = E Thomas Pöhlsen, Charge Collection in Si Detectors 13
14 Results: trapping = E G. Kramberger cm 2 /ns cm 2 /ns Strong field dependence seen! Less trapping for high fields. Previous investigations by G.Kramberger: = const, charge correction method, fluences up to = cm -2 Thomas Pöhlsen, Charge Collection in Si Detectors 14
15 Results: space charge N eff (T,, x) N eff linear in x higher N eff for low T higher N eff for large Thomas Pöhlsen, Charge Collection in Si Detectors 15
16 Charge multiplication Charge multiplication seen for 100 µm thick diodes and U > 800 V Thomas Pöhlsen, Charge Collection in Si Detectors 16
17 Summary Charge collection and trapping can be well described taking into account - distortions to the space charge distribution leading to parabolic electric fields (double peak) - field-dependence of trapping time (to fit CCE curves) - circuit effects (to simulate TCT signals) Trapping probability decreases with increasing E-field high E-fields desirable to reduce trapping probability 1/ Neff larger (more negative) for lower temperatures * here is an effective trapping time including trapping and detrapping Thomas Pöhlsen, Charge Collection in Si Detectors 17
18 Backup Slides Thomas Pöhlsen, Charge Collection in Si Detectors 18
19 U dep dependence on temperature Thomas Pöhlsen, Charge Collection in Si Detectors 19
20 Electric Field and Space Charge Distribution N eff Unirradiated diode p + n Irradiated diode: = cm -2 U = 300 V U = 300 V x [µm] x [µm] homogenous space charge distribution linear electric field linear space charge distribution parabolic electric field Thomas Pöhlsen, Charge Collection in Si Detectors 20
21 Determination of (E) Initial guess of field distribution (i.g. linear, parabolic) Assumption of electric field parameters Fit of CCE curves by simulation with parameter Agreement of measured and simulated TCT signal? Yes / No modification of E(x) (E) Thomas Pöhlsen, Charge Collection in Si Detectors 21
22 fluence Determination of Charge Collection Efficiency from TCT Measurements TCT signal Charge Collection Efficiency (CCE) U = 350 V Q Collected Charge Q = Deposited Charge Q 0 = I dt I non - irradiated dt CCE = Q / Q 0 Unirradiated diodes: CCE = 1 Trapping reduces collected charge Q. Thomas Pöhlsen, Charge Collection in Si Detectors 22
23 Thomas Pöhlsen, Charge Collection in Si Detectors 23
24 Overview of E(x), I(t) and CCE(U) for a DO Thomas Pöhlsen, Charge Collection in Si Detectors 24
25 CCE-curves measured with different setups Thomas Pöhlsen, Charge Collection in Si Detectors 25
26 Drift Velocity ( ) v sat = m/s 0 = m²/vs = (modified Jacoboni at 294 K) Thomas Pöhlsen, Charge Collection in Si Detectors 26
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