Irradiation and annealing study of 3D p-type strip detectors

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Irradiation and annealing study of 3D p-type strip detectors CNM double-sided 3D Measurements pre-irradiation Bulk capacitance Leakage current Interstrip capacitance Interstrip resistance Post-irradiation and annealing Future work Celeste Fleta, Manuel Lozano, Giulio Pellegrini (IMB-CNM, Barcelona)

Double-sided 3D at CNM Columns etched from opposite sides of substrate and don't pass through full thickness All fabrication done in-house ICP is a reliable and repeatable process (many successful runs) Electrode fabrication: ICP etching of the holes: Bosch process, ALCATEL 601-E Holes partially filled with 3 µm LPCVD poly Doping with P or B Holes passivated with TEOS SiO2 Hole aspect ratio 25:1 10µm diameter, 250µm deep P- and N-type substrates, 285µm thick C. Fleta, 5th “Trento” Workshop, 24/02/2010 2

Double-sided 3D fabrication runs First run (Nov’07): n-type, 2 wafers 1 for electrical tests and charge collection with strips, 1 for bump bonding of Medipix Two fabrication runs in October 2008: 6 n-type wafers (two were damaged during processing) 8 p-type wafers p-stop isolation Strip results shown today 6 new p-type wafers ready end of March 2010 ATLAS Medipix2 Pads Strips 4’’ 3D-wafer Designed by Glasgow Uni and CNM C. Fleta, 5th “Trento” Workshop, 24/02/2010

3D p-type strip detectors 3D guard ring Devices: » n+ strips » p- bulk » p+ back contact 50 strips DC coupled 50 electrodes/strip 4mm long strips 80 µm Common p-stop surrounding sensor area p-stop around each n-hole Yield for strip detectors in 2008 production = 86% C. Fleta, 5th “Trento” Workshop, 24/02/2010

Leakage current Before irradiation, T = 20ºC Backside biased, strip and guard ring grounded Can see VFD ~ 40V 2 – 6 nA/strip (40 – 120 pA/column) Only 2 detectors, of 19 tested, bad (not shown) Breakdown at less than 5V (catastrophic defect?) All others work far beyond full depletion C. Fleta, 5th “Trento” Workshop, 24/02/2010

Bulk capacitance ~4V lateral depletion Full depl ≈40V 0V Lat dep Full dep Full depl ≈40V Simulation by D. Pennicard, Glasgow Capacitance between strip and backside, neighbours also biased, 20ºC, 10 kHz C = 3 – 7 pF/strip depending on sensor C. Fleta, 5th “Trento” Workshop, 24/02/2010

Interstrip resistance Use two K2410 Sourcemeters: Bias in backside, guard ring to ground Sense test strip, varying voltage, keeping neighbours at ground Rint = 2/slope Non – irradiated I-V interstrip at 20ºC Vbias (V) Rint (GW) 5 28 15 50 20 52 30 99 40 94 Good P-stop isolation before irradiation C. Fleta, 5th “Trento” Workshop, 24/02/2010

Interstrip capacitance Use K2410 Sourcemeter and HP4284A LCR meter: K2410: Bias in backside, guard ring to ground 4284A: test strip HIGH, neighbours LOW 3 probes + guard ring Test Cint as function of frequency Values converge for higher frequencies Will use 1 MHz for tests C. Fleta, 5th “Trento” Workshop, 24/02/2010

Irradiations (with thanks to Karlsruhe, Freiburg) Fluence (neq/cm2) 5E14 1E15 2E15 5E15 1E16 2E16 N- and P-bulk short strip detectors were irradiated at Karlsruhe with 26 MeV protons. Irradiated cold, not biased No intentional annealing Max 5 days room temperature Distributed to test in Glasgow, Freiburg, CNM. 26 MeV protons scale to 1 MeV neutron equivalent fluence with a hardness factor of 1.85 Annealing P-type strip detector irradiated to 1016 neq/cm2 Accelerated annealing at 80ºC Acceleration factor of 7400 for the reverse annealing with respect to RT All tests at -10ºC in probe station C. Fleta, 5th “Trento” Workshop, 24/02/2010

Leakage current after irradiation Annealing time Charge multiplication? Leakage current, -10ºC, 1016 neq/cm2 Irradiated p-type, no annealing, -10ºC Leakage current increases with irradiation dose Two competing effects in annealing curves: Annealing of leakage current at low V Charge multiplication? More pronunced and earlier for longer annealing times C. Fleta, 5th “Trento” Workshop, 24/02/2010

Bulk capacitance vs fluence Irradiated p-type sensors, no annealing, -10ºC Lateral depletion voltage estimated from log-log plot, error bars take into account choice of points for lines fitting Not possible to distinguish full depletion in plots C. Fleta, 5th “Trento” Workshop, 24/02/2010

Bulk capacitance vs annealing time Bulk capacitance, -10ºC, 10 kHz, 1016 neq/cm2 480 min Vlat ~ 170 V Anomalous behaviour of C appears at high voltages As with the IVs, effect is more marked for longer times Vlat increases with annealing time at 80ºC Vlat (0 min) ~ 148V, Vlat (480 min) ~ 170V C. Fleta, 5th “Trento” Workshop, 24/02/2010

Interstrip capacitance vs fluence Irradiated p-type sensors, no annealing, -10ºC, 1MHz Cint saturates at lower voltages for irradiated sensors Cint seems to decrease with initial irradiation, then increase again with dose. Might be just difference between sensors (one for each dose only) C. Fleta, 5th “Trento” Workshop, 24/02/2010

Interstrip capacitance vs annealing time Interstrip capacitance, -10ºC, 1 MHz, 1016 neq/cm2 Interstrip capacitance changes very little with annealing time at 80ºC. More likely due to strip to strip variation than annealing effect C. Fleta, 5th “Trento” Workshop, 24/02/2010

Interstrip resistance vs fluence Irradiated p-type sensors, no annealing, -10ºC Interstrip current too low (pA) to obtain Rint of non-irradiated sensor at -10ºC (~100 GW at 20ºC) Measured resistance decreases with irradiation dose P-stop works well even for highest irradiation Rint >100 MW for 1016 neq/cm2 C. Fleta, 5th “Trento” Workshop, 24/02/2010

Interstrip resistance vs annealing time multiplication Interstrip resistance, -10ºC, 1016 neq/cm2 100V: interstrip resistance increases with time as substrate becomes more p-type and compensates negative charge in surface 150 V: Rint measured decreases for t > 15 min charge multiplication C. Fleta, 5th “Trento” Workshop, 24/02/2010

Conclusions I have presented an irradiation and annealing study of 3D P-type strip sensors from CNM irradiated with 26 MeV protons up to 1E16 neq/cm2 Depletion voltage increases with irradiation dose and annealing time. V(lat depl) lower than 150 V for 1E16 without annealing Leakage current increases with dose, shows typical annealing behaviour for low voltages. Charge multiplication appears at higher voltages, earlier for longer annealing times Strip isolation decreases with dose, p-stop works well even for higher irradiation Multiplication effect also seen in annealing curves of interstrip resistance Interstrip capacitance doesn’t change much with irradiation or annealing Annealing study of n-type sensor irradiated to 1E16 neq/cm2 started C. Fleta, 5th “Trento” Workshop, 24/02/2010

Future 3D Work 4 pA/pixel @ 20V (VFD = 9 V) Irradiation and test beams with Medipix (Timepix) detectors for LHCb VELO upgrade. Atlas pixels, FE-I3 and new FE-I4 fabrication, irradiation and test beam. In the framework of the ATLAS 3D Collaboration New run of 3D-Medipix3 already fabricated, standard (2 cm2) and quad area (16 cm2) 4 pA/pixel @ 20V (VFD = 9 V) C. Fleta, 5th “Trento” Workshop, 24/02/2010