New developments in wide bandgap CdZnTe (CZT) semiconductor ...

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Conclusions 1 � Two growth method: Bridgman, THM, and floating zone � THM is the most promising � Grown crystals are far from perfect: • Te-reach secondary phases (inclusions and precipitates) • Twinning • Subgrain boundaries � Difficult to grow in comparison to Ge and Si (Czochralski)
2. Operation principle of ionization detectors � Low mobility of holes (single-charge carrier device) � This makes CZT detectors different from HPGe Q � Q -O out col Collected charge (mostly electrons) Qind � E ph D z ind Charge induced by trapped carriers (mostly holes). It is function of coordinates D E ph A detector’s design should provide efficient way for illuminating the effect of holes! z Incident photon HV- Spectral response to monoenergetic photons
Page 1 and 2: New developments in wide bandgap Cd
Page 3 and 4: Advantages of Cadmium Zinc Tellurid
Page 5 and 6: Progress in CZT detector developmen
Page 7 and 8: Spectra of 152 Eu source measured w
Page 9 and 10: Cadmium Zinc Telluride (CZT) detect
Page 11 and 12: φ32 mm ’89 φ50 mm ’94 0.6 kg
Page 13 and 14: CZT 11-1 seed loading procedure see
Page 15 and 16: CZT synthesis in rocking furnace
Page 17 and 18: CZT 10-1 results - grain structure
Page 19: Redlen’s more recent 100 mm diame
Page 23 and 24: 3. Defects in commercial CZT materi
Page 25 and 26: Motorized X-Y-Z translational stage
Page 27 and 28: An example of a stack of 100 images
Page 29 and 30: Twin boundaries decorated by Te inc
Page 31 and 32: Micro-scale X-ray mapping at BNL’
Page 33 and 34: Spatial resolution and flux of Sync
Page 35 and 36: Comparison between two detectors De
Page 37 and 38: 28 keV 1000 V, 50 mm step Response
Page 39 and 40: Prismatic punching dislocation patt
Page 41 and 42: 2x1.5 mm 2 Photograph of the etched
Page 43 and 44: 10 inches Two types of contrast: ge
Page 45 and 46: Subgrain boundaries exist in all co
Page 47 and 48: X-ray response mapping of the netwo
Page 49 and 50: X-ray maps of CPG Illuminating from
Page 51 and 52: Rejection of the incomplete charge
Page 53 and 54: Rejection of ICC
Page 55 and 56: 133 Ba source
Page 57 and 58: Applications
Page 59 and 60: Testing the array: raw data � Use
Page 61 and 62: BNL develops camera for prostate ca
Page 63 and 64: Medical - Future • $B/Yr market -
Page 65 and 66: A High-Resolution MRI-Compatible SP
Page 67 and 68: B A Animal PET scanner animal bed V
Page 69 and 70: 4.5 cm Digital readout PCB CdZnTe/C
Page 71 and 72:
Tomographic acquisition setup Radiu
Page 73 and 74:
Scientific Research • Astrophysic
Page 75 and 76:
CdZnTe gamma camera 32,000 4x4x2mm
Page 77 and 78:
Motivation for ProtoEXIST Implement
Page 79 and 80:
ProtoEXIST2 Detectors Crystal Units
Page 81 and 82:
Security & Surveillance • Nuclear
Page 83 and 84:
Detectors with electronics CZT Copl
Page 85 and 86:
The power of pixels! 20x20x15 cm 3
Page 87 and 88:
Motivation Dose rate monitoring net
Page 89 and 90:
� Silicon and CZT in one copper b
Page 91 and 92:
3 generations to reach optimal perf
Page 93 and 94:
Dual CdTe Medipix2 Flood Frames Si
Page 95 and 96:
Image Correction Demonstration of C
Page 97 and 98:
Conclusions � Quality and high co
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