Presentation is loading. Please wait.

Presentation is loading. Please wait.

Recent Trends in the Development of CdTe and CdZnTe Semiconductor Detectors for Astrophysical Applications S. Del Sordo 1, L. Abbene 1,2, N. Auricchio.

Similar presentations


Presentation on theme: "Recent Trends in the Development of CdTe and CdZnTe Semiconductor Detectors for Astrophysical Applications S. Del Sordo 1, L. Abbene 1,2, N. Auricchio."— Presentation transcript:

1 Recent Trends in the Development of CdTe and CdZnTe Semiconductor Detectors for Astrophysical Applications S. Del Sordo 1, L. Abbene 1,2, N. Auricchio 1,E. Caroli 1, M. Quadrini 1, J.B. Stephen 1, A. Zappettini 3, R.M. Curado Da Silva 4, O. Limousin 5, A. Meuris 5 and P. Ubertini 1 1 IASF-INAF, Italy 2 DiFTeR Università di Palermo, Palermo, Italy 3 IMEM-CNRParma, Italy 3 IMEM-CNR, Parma, Italy 4 Departmentode FísicaUniversidade de Coimbra, Coimbra, Portugal 4 Departmento de Física, Universidade de Coimbra, Coimbra, Portugal 5 CEA– DSM - Irfu - Service dAstrophysique, Saclay, France 5 CEA – DSM - Irfu - Service dAstrophysique, Saclay, France The Extreme Sky " Sampling the Universe above 10 keV" 13 - 17 October 2009 Otranto

2 The Extreme Sky, Otranto16 th October 2009 Outline Scenario (projects and collaborations) Scenario (projects and collaborations) CdTe / CdZnTe X-ray and gamma ray detectors CdTe / CdZnTe X-ray and gamma ray detectors Detector prototypes Detector prototypes Work in progress and future developments Work in progress and future developments Conclusions Conclusions

3 The Extreme Sky, Otranto16 th October 2009 Projects and Collaborations Progetto ASI Alte Energie (Study for the Gamma Ray Imager mission) Progetto PRIN INAF SGRIP (funded by INAF) Development of an high efficiency wide band 3D CZT detector prototype for Laue telescope focal plane Progetto PRIN (funded by MIUR) Growth technologies and spectroscopic optimization for X and Gamma ray detectors based on CdTe/CdZnTe. IASF-INAF (Milano Bologna Roma Palermo) IASF-INAF (Milano Bologna Roma Palermo) IMEM-CNR di Parma (crystal growth) IMEM-CNR di Parma (crystal growth) Università di Lecce (crystal growth and bonding) Università di Lecce (crystal growth and bonding) IMM-CNR di Lecce (bonding and electrical characterization) IMM-CNR di Lecce (bonding and electrical characterization) DIFTER Università di Palermo (medical applications) DIFTER Università di Palermo (medical applications) The Italian collaboration ESRF Grenoble Leicester University DTU Space Copenaghen Coimbra University CEA Saclay Paris ICE-CSIC Barcelona International collaborations

4 The Extreme Sky, Otranto16 th October 2009 CdTe and CdZnTe I High Z semiconductors (Z max = 52) Wide band gap semiconductors Del Sordo S. et al., Sensors, Vol. 9, 3491-3526, 2009.

5 The Extreme Sky, Otranto16 th October 2009 CdTe and CdZnTe II Critical Issues Poor transport properties of the charge carriers: h h ~ 10 -5 -10 -6 cm 2 / V e e ~ 10 -2 -10 -3 cm 2 /V) Small electrical signals at the electrodes Small crystal size: typically < 2 cm 3 Development of single charge carrier sensing detectors (pixel, strip, Frisch grid, multiple electrodes) to overcome the poor transport properties of the holes is mandatory. L. Abbene et al., NIM A 583 (2007) 324-331. 1 mm

6 The Extreme Sky, Otranto16 th October 2009 CdTe and CdZnTe III Suppliers of Spectrometer grade crystals Italian group at IMEM-CNR (A. Zappettini): CdZnTe crystals grown by the boron oxide encapsulated vertical Bridgman technique A. Zappettini et al., IEEE Nucl. Sci. Symp. Conf. Rec. 2008, 118-121. 2-inch CdZnTe crystal 1.1 mm

7 The Extreme Sky, Otranto16 th October 2009 CdZnTe detector prototypes DETECTORS CHARACTERISTICS Pixel detectorsCZT (eV Products) Geometric surface10×10 mm 2 Active area8×8 mm 2 Thickness 1 mm and 2 mm Number of pixels256 Pitch 0.5 mm (0.45 mm anodes, 0.05 mm gap) focal plane detector prototypes for Hard X-ray multilayer telescopes (10-100 keV) CZT pixel detectors

8 The Extreme Sky, Otranto16 th October 2009 Energy (keV) Energy resolution (%) Peak to valley ratio (2 x FWHM) 59.55.80 ± 0.1628.1 ± 1.1 88,13.9 ± 0.219.5 ± 1.1 CZT pixel detectors performance L. Abbene et al., JAP, Vol. 105, 2009. CdZnTe detector prototypes

9 The Extreme Sky, Otranto16 th October 2009 thickness 1 mm 2 mm energy resolution (%) (59.5 keV) 5.80 ± 0.16 5.50 ± 0.10 energy resolution (%) (88.1 keV) 3.9 ± 0.2 3.50 ± 0.13 deviation of the FW.1M/FWHM ratio from the Gaussian ratio (1.82) (59.5 keV) 8 % 5 % deviation of the FW.1M/FWHM ratio from the Gaussian ratio (1.82) (88.1 keV) 16 % 10 % Small pixel effectSmall pixel effect H. Barrett, J. Eskin, H. Barber, Phys. Rev. Lett. 75 (1995) 156 CdZnTe detector prototypes CZT pixel detectors performance 2 mm thick detector vs 1 mm

10 The Extreme Sky, Otranto16 th October 2009 CdZnTe detector prototypes POLarimetry with CdZnTe Arrays) CZT pixel detector for the POLCA II Experiment ( POLarimetry with CdZnTe Arrays) DetectorCZT Imarad 4x4 cm 2, 5 mm thick HV = -600 V 16x16 pix with 2.5 mm pitch 11x11 + 7 pix used Readout Electronics 8 eV products ASIC 16 channels/chip 33/50/100/200 sel. Gain 0.6/1.2/2.4/4 μs shaping time The POLCA quick look S/W user interface (LABVIEW)

11 The Extreme Sky, Otranto16 th October 2009 CdZnTe detector prototypes Polca experiment: Set-up at ESRF beam line ID15B and Results Counts maps (scattered events) pixel 186, Energy 200 keV, Angle 0, 45 degree

12 The Extreme Sky, Otranto16 th October 2009 Basic sensitive CZT unit External Dimensions: 10×10×2.5 mm 3 Anode side: 8 anodes strips 0.15 mm wide (pitch=2.5 mm) correcting field strips 0.15 mm wide gap between strips=0.15 mm Cathode side: 4 cathodes strips 2.4 mm wide gap between strips=0.10 mm 3D detector prototype packaging scheme: The detector assembly is built with 8 identical modules packed together (64 anodes and 32 cathodes). I/O pads Alumina support Front end electronics board data handling and logic board Small 3D CZT position sensitive spectrometer (SmallGRIPrototype) Redout Electronics NOVARAD Rena3 CdZnTe detector prototypes See Poster E. Caroli et al. SGRIP …

13 The Extreme Sky, Otranto16 th October 2009 Future Developments The POLCaliste experiment Low noise readout electronics r.m.s. 80 e - Caliste Module CdTe Schottky detector

14 The Extreme Sky, Otranto16 th October 2009 Future Developments The POLCaliste experiment Polarimetric measurements at ESRF with the PolCaliste prototype are foreseen in 2010. We foresee to use in a first run the 64 ch device and in a next step the new 256 ch device. The device thickness will be 0.5, 1, 2 mm Energy resolution 1.5 % (FWHM) @ 59.5 keV T = -15 °C POLCaliste Experiment (POLarimetry with Caliste) Caliste module performance

15 The Extreme Sky, Otranto16 th October 2009 Conclusions (I) Italian CZT detector development (crystal growth and detectors assembly) activities are in progress with quite good expectations. Experimental activities devoted to characterize imaging spectrometer operative in the 10 -100 keV energy band are in progress. The SGRIP experiment (considered as a pathfinder for GRI) is in an advanced realization phase. The study of the prototype performances, foreseen in the 2010, will allow the optimization of the main operative parameters for a detector operative up to 800 keV in stack configuration. The polarimetric performances of the POLCAII experiment are under evaluation. Measurements with the improved POLCaliste experiment are foreseen in the 2010 at ESRF.

16 The Extreme Sky, Otranto16 th October 2009 Very recently ASI funded a technological project named : LAUE - A Gamma Ray Lens. In this project our collaboration has the responsibility of the focal plane detector (4 x 4 cm 2, 0.5 mm spatial resolution, good energy resolution) for the test of the lens prototypes. In this framework one of the most appealing possibilities will be the use of an array of Calliste detectors in the new 256 channel version. Conclusions (II)


Download ppt "Recent Trends in the Development of CdTe and CdZnTe Semiconductor Detectors for Astrophysical Applications S. Del Sordo 1, L. Abbene 1,2, N. Auricchio."

Similar presentations


Ads by Google