Edgeless sensors for full-field X-ray imaging
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1 Edgeless sensors for full-field X-ray imaging 12 th iworid in Cambridge July 14 th, 2010 Marten Bosma 12 th iworid, Cambridge - July 14 th, 2010
2 Human X-ray imaging High spatial resolution Low-contrast resolution High dynamic range Medipix Good noise performance Human X-ray imaging ( kev) High detective quantum efficiency Good charge collection efficiency Good quality high-z sensors High absorption (CdTe-based) Full field imaging Large area (edgeless detectors) Good spectrometric properties Medipix 3 12 th iworid, Cambridge - July 14 th, 2010
3 Current status Four Medipix chips underneath one large sensor (Quad module). ~ 7.5 cm Four Quads in one cooling rig. ~ 0.5 cm Inactive seam of ~ 0.5 cm along one dimension. 12 th iworid, Cambridge - July 14 th, 2010
4 Edgeless modules Quad Sensor with Guard Ring Medipix ASIC Medipix ASIC PCB Ball-Grid-Array Through-Silicon-Via Medipix ASIC Edgeless Quad Sensor Medipix ASIC PCB
5 Edge termination Edge issues: Minimization of charge injection; Confinement of the depletion region; Prevention of high-field regions. Edgeless reduction of inactive periphery by: Less-deleterious dicing: Etching Laser dicing (stealth dicing) Design: Active edge Current termination (stop ring) Pixel Detectors Rossi 12 th iworid, Cambridge - July 14 th, 2010
6 Separation steps 1 st etch (SF 6 C 4 F 8 SF 6 etc.) 1. p + n + n-type Si bulk 2. phosphorus diffusion for: ii. i. Edge activation Surface state passivation Mask material 3. Phosphorus (n + ) 2 nd etch
7 Conventional vs. Edgeless 500 µm 50 µm
8 Stop ring functionality Effect of grounding the stop ring n + stop ring V bias p + stop ring 12 th iworid, Cambridge - July 14 th, 2010 V bias
9 Fabrication by Canberra Samples Medipix pixel sensors (10 30 µm edge distance) TOTEM strip sensors (30 µm and 50 µm edge distance) Rectangular test diodes ( µm edge distance) Circular test diodes ( µm edge distance) DRIE dicing and phosphorus diffusion by IMEC Characterization by Nikhef Medipix sensor TOTEM strip sensor Rectangular diode Circular diode 12 th iworid, Cambridge - July 14 th, 2010
10 Humidity No significant dependence on humidity level (except for severely damaged structures)
11 Temperature Normal temperature dependence of thermal generation current
12 J V curves T = K R.H. = % V dep 25 V (from J-V fits) N d (substrate) cm -3 (from resistivity) V fd (V) J 50V (na/cm 2 ) J 50V (na/cm 2 ) Conv Edgeless At 50 V reverse bias, current density levels are: na/cm 2 for p + stop ring structures; na/cm 2 for n + stop ring structures; having a 50 µm edge distance (one pixel column). Breakdown at ( ) V
13 C V curves T = 295 K; R.H. = 30 % f = 100 khz; V AC = 30 mv RMS V dep V (from C-V curves) N d (substrate) (5 7) cm -3 (1/C 2 -V curves) At V dep the capacitance is approx. 10 pf
14 Proof-of-principle Edgeless vs. Conventional
15 J V measurements Inverse correlation: Edge distance and stop ring width current density Structures with a 50 µm edge distance and a 15µm wide stop ring show acceptable current densities at 50 V reverse bias.
16 300 µm edge dist. and 25 µm SR C V curve effects 13 µm edge dist. and 5 µm SR
17 Charges at Si/SiO 2 interface charges/cm 3 at the Si/SiO 2 interface TCAD simulation 12 th iworid, Cambridge - July 14 th, 2010
18 Summary Integrity checks: No significant influence of humidity and normal temperature dependence. Depletion voltage is approximately 25 V; Breakdown at ( ) V reverse bias; The edgeless and conventionally processed devices show comparable current densities. The p+ stop ring structures show lower current densities than the n+ stop ring ones: na/cm 2 for p + stop ring structures; na/cm 2 for n + stop ring structures; with 50 um edge distance, at 50 V reverse bias. Inverse correlation between leakage-current density and both edge distance and stop ring width: Structures with a 50 µm edge distance and a 15 µm wide stop ring show acceptable current-density values. 12 th iworid, Cambridge - July 14 th, 2010
19 What s next? Edge effects in CdTe-based (high-z) sensors. Examination of other dicing techniques (e.g. stealth dicing) Blade diced Stealth diced 12 th iworid, Cambridge - July 14 th, 2010
20 Acknowledgements Canberra: P. Burger, O. Evrard Imec: P. De Moor, K. De Munck, D. S. Tezcan Nikhef: J.L. Visschers, J. Visser 12 th iworid, Cambridge - July 14 th, 2010
21 Back-up slides 12 th iworid, Cambridge - July 14 th, 2010
22 12 th iworid, Cambridge - July 14 th, 2010
23 Dicing Blade dicing Deep Reactive Ion Etching
24 Humidity Severely damaged edge No significant dependence on humidity level (except for severely damaged structures)
25 Integrity checks Temperature
26 J V curve fits V V V V FD FD : : I A V BV C leak I A V BV C leak FD A [na/( Vcm 2 )] B [na/(vcm 2 )] C [na/cm 2 ] V fd (V) J 50V (na/cm 2 ) J 50V (na/cm 2 ) Conv Edgeless
27 Electrostatic potential p + stop ring 5 µm SR; 10 µm edge dist. 50 µm SR; 100 µm edge dist SR floating SR biased
28 Stop ring functionality No stop ring 50 µm wide stop ring Hole-current density (changing parameter: electron and hole recombination velocity at the edge)
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