Electric field distribution of cadmium zinc telluride (CZT) detectors

2009 ◽  
Author(s):  
G. Yang ◽  
A. E. Bolotnikov ◽  
G. S. Camarda ◽  
Y. Cui ◽  
A. Hossain ◽  
...  
Keyword(s):  
Electric Field ◽  
Field Distribution ◽  
Electric Field Distribution ◽  
Cadmium Zinc Telluride ◽  
Zinc Telluride ◽  
Czt Detectors ◽  
Cadmium Zinc

On the Active Volume of Cadmium Zinc Telluride Gamma-Ray Spectrometers

1997 ◽  
Vol 487 ◽  
Author(s):  
J. C. Lund ◽  
B. A. Brunett ◽  
T. P. Viles ◽  
N. R. Hilton ◽  
R. B. James
Keyword(s):  
Gamma Ray ◽  
Cadmium Zinc Telluride ◽  
Pulse Height ◽  
Zinc Telluride ◽  
Charge Trapping ◽  
Active Volume ◽  
Electronic Signal Processing ◽  
Czt Detectors ◽  
Unipolar Devices ◽  
Cadmium Zinc

AbstractIn this paper we develop quantitative models to predict the active volume of cadmium zinc telluride (CZT) detectors operated as gamma-ray pulse height spectrometers. Three cases are considered: a conventional planar detector, a unipolar device, and a detector in which electronic signal processing has been applied to correct for charge trapping effects. We find that existing detectors are very limited in their maximum attainable active volume, but unipolar devices with charge correction show promise for producing large active volume devices.

Investigation of the internal electric field in cadmium zinc telluride detectors using the Pockels effect and the analysis of charge transients

2010 ◽  
Vol 107 (2) ◽  
pp. 023704 ◽  
Author(s):  
Michael Groza ◽  
Henric Krawczynski ◽  
Alfred Garson ◽  
Jerrad W. Martin ◽  
Kuen Lee ◽  
...  
Keyword(s):  
Electric Field ◽  
Cadmium Zinc Telluride ◽  
Zinc Telluride ◽  
Internal Electric Field ◽  
Pockels Effect ◽  
Cadmium Zinc

scholarly journals Modern possibilities of cardiovascular imaging using gamma cameras with cadmium–zinc–telluride-detectors

2020 ◽  
Vol 24 (3) ◽  
pp. 11
Author(s):  
S. M. Minin ◽  
K. V. Zavadovky ◽  
N. A. Nikitin ◽  
A. V. Mochula ◽  
A. B. Romanov
Keyword(s):  
Conflict Of Interest ◽  
Cadmium Zinc Telluride ◽  
Zinc Telluride ◽  
Diagnostic Tools ◽  
Cardiac Spect ◽  
Gamma Cameras ◽  
Non Invasive ◽  
Flow Reserve ◽  
Czt Detectors ◽  
Cadmium Zinc

<p>Myocardial perfusion imaging is considered one of the leading non-invasive diagnostic tools for the assessment of patients with known or suspected coronary artery disease and other cardiac pathologies. The technical improvement of the currently used gamma-tomographic devices has increased the diagnostic capability of this technique. In recent years, the use of dedicated cardiac SPECT cameras with solid-state cadmium–zinc–telluride (CZT) technology has increased in nuclear imaging. These new CZT technologies have several advantages over existing scanner models. The development of new CZT detectors and their collimator configuration has increased scanning sensitivity and spatial resolution values. Also, due to the significantly higher sensitivity of new CZT detectors and new methods of data processing, radiologists have already introduced new scanning protocols and methods for radionuclide assessment of myocardial blood flow, reserve and non-invasive visualisation of the functioning of the sympathetic nervous system into clinical practice. The purpose of this review is to provide data on the main technical characteristics of gamma cameras equipped CZT detectors as well as the current possibilities of using CZT cameras for examining patients with various cardiovascular diseases.</p><p>Received 1 April 2020. Revised 22 April 2020. Accepted 30 April 2019.</p><p><strong>Funding:</strong> The work is supported by a grant of the Russian Science Foundation No. 17-75-20118.</p><p><strong>Conflict of interest:</strong> Authors declare no conflict of interest.</p><p><strong>Author contributions</strong><br />Conception and study design: S.M. Minin, K.V. Zavadovky, A.B. Romanov<br />Drafting the article: S.M. Minin, K.V. Zavadovky, N.A. Nikitin, A.V. Mochula, A.B. Romanov<br />Critical revision of the article: S.M. Minin, K.V. Zavadovky<br />Final approval of the version to be published: S.M. Minin, K.V. Zavadovky, N.A. Nikitin, A.V. Mochula, A.B. Romanov</p>

scholarly journals Opto-electrical characterization and X-ray Mapping of large-volume cadmium zinc telluride radiation detectors

2009 ◽  
Vol 1164 ◽  
Author(s):  
Ge Yang ◽  
Aleksey E Bolotnik ◽  
Giuseppe Camarda ◽  
Yonggang Cui ◽  
Anwar Hossain ◽  
...  
Keyword(s):  
Large Volume ◽  
Cadmium Zinc Telluride ◽  
Radiation Detection ◽  
Zinc Telluride ◽  
Radiation Detectors ◽  
Internal Electric Field ◽  
Pockels Effect ◽  
X Ray ◽  
Czt Detectors ◽  
Cadmium Zinc

AbstractLarge-volume cadmium zinc telluride (CZT) radiation detectors would greatly improve radiation detection capabilities and, therefore, attract extensive scientific and commercial interests. CZT crystals with volumes as large as hundreds of centimeters can be achieved today due to improvements in the crystal growth technology. However, the poor performance of large-volume CZT detectors is still a challenging problem affecting the commercialization of CZT detectors and imaging arrays. We have employed Pockels effect measurements and synchrotron X-ray mapping techniques to investigate the performance-limiting factors for large-volume CZT detectors. Experimental results with the above characterization methods reveal the non-uniform distribution of internal electric field of large-volume CZT detectors, which help us to better understand the responsible mechanism for the insufficient carrier collection in large-volume CZT detectors.

Characterization of Extended Defects Observed in Cadmium Zinc Telluride (CZT) Crystal

2015 ◽  
Vol 1792 ◽  
Author(s):  
Samuel Uba ◽  
Stephen Babalola ◽  
Anwar Hossain ◽  
Ralph James
Keyword(s):  
Electrical Properties ◽  
Grain Boundaries ◽  
Cadmium Zinc Telluride ◽  
Zinc Telluride ◽  
High Energy ◽  
Extended Defects ◽  
Detector Performance ◽  
Te Inclusions ◽  
Czt Detectors ◽  
Cadmium Zinc

ABSTRACTCadmium Zinc Telluride (CZT) semiconductor crystal properties have been studied extensively with a focus on correlations to their radiation detector performance. The need for defect-free CZT crystal is imperative for optimal detector performance. Extended defects like Tellurium (Te) inclusions, twins, sub-grain boundaries, and dislocations are common defects found in CZT crystals; they alter the electrical properties and, therefore, the crystal's response to high energy radiation. In this research we studied the extended defects in CZT crystals from two separate ingots grown using the low-pressure Bridgman technique. We fabricated several detectors cut from wafers of two separate ingots by dicing, lapping, polishing, etching and applying gold metal contacts on the main surfaces of the crystals. Using infrared (IR) transmission microscope we analyzed the defects observed in the CZT detectors, showing three dimensional scans and plot size distributions of Te inclusions, twins and sub-grain boundaries observed in particular regions of the CZT detectors. We characterized electrical properties of the detectors by measuring bulk resistivity and detector response to gamma radiation. We observed that CZT detectors with more extended defects showed poor opto-electrical properties compared to detectors with fewer defects.

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