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investigation of cadmium zinc telluride as a room temperature radiation detector

James Simon Sebastian Penfold

investigation of cadmium zinc telluride as a room temperature radiation detector

  • 233 Want to read
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Published .
Written in English


Edition Notes

Thesis (M.Sc.) University of Surrey, 1994.

StatementJames Simon Sebastian Penfold.
ContributionsUniversity of Surrey. Department of Physics.
ID Numbers
Open LibraryOL19592429M

The CZT/(S) is a nuclear radiation detector based on CADMIUM ZINC TELLURIDE - CdZnTe, a large bandgap semiconductor materials having a high atomic number and high density, which makes these detectors one of the most sensitive small size room temperature operation detectors. MSDS Cadmium Zinc Telluride V2 () NON-CONTROLLED COPY 1/4 This Material Safety Data Sheet complies with Controlled Products Regulations (SOR/) and with ANSI Z SECTION 1. PRODUCT AND COMPANY IDENTIFICATION Product name . Cadmium-Zinc-Telluride Detectors. Cadmium Zinc Telluride (CZT) is a high Z, large bandgap, semiconductor which became standard hard X-ray detectors in many fields. The material has good electron transport properties, and the spectroscopic performance surpasses that of regular scintillators. Looking for cadmium telluride detector? Find out information about cadmium telluride detector. A photoconductive cell capable of operating continuously at ambient temperatures up to °F ; used in solar cells and infrared, nuclear-radiation, and Explanation of cadmium telluride detector.

BULK GROWTH AND CHARACTERIZATION OF CADMIUM ZINC TELLURIDE CRYSTALS FOR MERCURY CADMIUM TELLURIDE INFRARED DETECTOR APPLICATIONS Submitted by HASAN YASİN ERGUNT in partial fulfillment of the requirements for the degree of Master of Science in Micro and Nanotechnology Department, Middle East Technical University by, Prof. Dr. Canan Özgen.


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investigation of cadmium zinc telluride as a room temperature radiation detector by James Simon Sebastian Penfold Download PDF EPUB FB2

Cadmium zinc telluride (CZT) has remained a major focus of research due to its promising application as a room-temperature nuclear radiation detector material. Among the several parameters that substantially affect the detectors' performance, an important one is the distribution of the internal electric field.

Cadmium zinc telluride CZT is a room temperature semiconductor that directly converts X-ray or gamma-ray photons into electrons. Kromek specialises in growing CZT crystals investigation of cadmium zinc telluride as a room temperature radiation detector book turning it into radiation detectors that offer excellent energy resolution and high charge collection efficiency.

Cadmium zinc telluride, (CdZnTe) or CZT, is a compound of cadmium, zinc and tellurium or, more strictly speaking, an alloy of cadmium telluride and zinc telluride.A direct bandgap semiconductor, it is used in a variety of applications, including semiconductor radiation detectors, photorefractive gratings, electro-optic modulators, solar cells, and terahertz generation and homemadehattie.comm(I): Cd₂(AlCl₄)₂.

applications in room-temperature radiation detection. Compared to investigated the widely cadmium zinc telluride (CZT), CMT offers some distinct advantages that make it a good candidate to compete with CZT in applications. First, the segregation coeffsuch icient of Mn in.

Jan 07,  · Cadmium manganese telluride (CMT) has high potential as a material for room-temperature nuclear-radiation detectors. We investigated indium-doped CMT crystals taken from the stable growth region of the ingot and compared its characteristics with that from the last-to-freeze homemadehattie.com by: 9.

The Cadmium Zinc Telluride (CZT) Detector Array Innovation Pathway This pathway describes the development of soft gamma-ray/hard x-ray detector arrays at NASA’s Goddard Space Flight Center (GSFC, or Goddard), through a collaboration between the gamma-ray spectroscopy group and the detector branch.

The Cadmium Zinc Telluride (CdZnTe. Abstract. Three tools were developed towards design of an ambient temperature radiometric instrument, namely the CZT Probe--a cadmium zinc telluride based gamma and x ray detector probe, the MicroNOMAD--a low power, portable multichannel analyzed, and CZTU--spectral analysis software that provides uranium enrichment analysis.

May 12,  · Among the compound semiconductors, cadmium telluride (CdTe) and cadmium zinc telluride (CdZnTe) are the most promising materials for radiation detectors with good energy resolution, high detection efficiency and room temperature operation.

This paper is a review of recent advances in the development of CdTe and CdZnTe radiation homemadehattie.com by: room-temperature X-ray and gamma-ray detectors • electrooptic devices, • solar cells.

Room-temperature bandgap and lattice parameters of CdTe were reported to be eV and Å respectively, and eV and for zinc telluride (ZnTe).Cited by: 1. An Investigation of the Electronic Properties of Cadmium Zinc Telluride Surfaces using Pulsed Laser Microwave Cavity Perturbation Gary Tepper a, Royal Kessick a and Csaba Szeles b a Department of Chemical Engineering, Virginia Commonwealth University, Richmond, VA Cadmium telluride (CdTe) is a stable crystalline compound formed from cadmium and tellurium.

It is mainly used as the semiconducting material in cadmium telluride photovoltaics and an infrared optical window. It is usually sandwiched with cadmium sulfide to form a p-n junction solar PV cell.

Typically, CdTe PV cells use a n-i-p homemadehattie.comal formula: CdTe. Cadmium telluride (CdTe) and cadmium zinc telluride (CdZnTe) have been regarded as promising semiconductor materials for hard X-ray andγ-ray detection.

The high atomic number of the materials (Z Cd =48, Z Te=52) gives a high quantum efficiency in comparison with Si. The large band-gap energy (Eg ˘ eV) allows us to operate the detector at.

Ion beam induced charge collection (IBICC) and time resolved IBICC (TRIBICC) techniques were used for imaging electronic properties of cadmium zinc telluride (CZT) room temperature radiation detectors. The detectors were bombarded with a scanned MeV He microbeam and the detector response was analyzed at each homemadehattie.com by: 9.

Cadmium zinc telluride and its use as a nuclear radiation detector material Article in Materials Science and Engineering R Reports 32(4) · April with Reads How we measure 'reads'. Mar 17,  · We investigated the effects of post-growth annealing on cadmium zinc telluride crystals intended for use as room-temperature radiation detectors.

Annealing under Cd vapor effectively eliminated Te inclusions. The material’s resistivity was lowered, and loss of Zn component was observed.

Annealing under Cd + Zn vapors similarly removed Te homemadehattie.com by: Although cadmium zinc telluride (CZT) is the most widely used room-temperature photoconductor for low flux radiation sensing, utilization of this promising material in high flux applications, like. To date, cadmium zinc telluride CZT has captured con-siderable interest due to its potential in many applications as a room temperature radiation detector.

The application of CZT is very much thickness dependent. The typical thickness of CZT for detecting energy less than keV is usually 6 mm or less, which is adequate for applications such as.

Publications, Patents and Books. Patents. Patent title, “Low-cost, High Compositional Uniformity Cd 1-x Zn x Te 1-y Se y for Radiation Detector Applications”, Under Review by Office of Intellectual Property, ; Patent title, “Improved Contacts of Radiation Detectors for Detecting/Imaging X-rays and Gamma-rays”, Under Review by Office of Intellectual Property, Oct 14,  · Of these factors, the degradation of characteristic x-rays is an inherent phenomena in cadmium zinc telluride (CZT) that will always be present and cannot be reduced regardless of detector operating parameters (e.g., charge sharing can be reduced with increased bias voltage, pulse pileup can be reduced by lower the input flux etc.).Cited by: 6.

Cadmium zinc telluride has been developed as a room temperature radiation detector in recent years. The issue of decreasing surface leakage current, which affects the energy resolution of radiation response, was investigated extensively by various surface oxidation treatments.

In this study, an aqueous solution of hydrogen peroxide (H 2 O 2) was used in the oxidation of CdZnTe wafers in order Cited by: Keywords: Cadmium zinc telluride, detector fabrication, contacts, surface preparation 1. INTRODUCTION There is presently a widespread need for room temperature gamma and X-ray imaging capability for both medical and industrial applications.

Solid state CZT arrays offer. Aug 29,  · The electronic transport properties of Cadmium Zinc Telluride (CZT) determine the charge collection efficiency (i.e.

the signal quality) of CZT detectors. These properties vary on both macroscopic and microscopic scale and depend on the presence of impurities and defects introduced during the crystal growth. Ion Beam Induced Charge Collection (IBICC) is a proven method to measure the Author: Bruce A.

Brunett, Barney L. Doyle, Ralph B. James, Gyorgy Vizkelethy, David S. Walsh. Although Cadmium Zinc Telluride (CZT) hard X-ray and gamma-ray detectors with excellent spatial and energy resolution have been developed, the high costs of conventionally grown CZT crystals (horizonthal and vertical high pressure Bridgeman CZT) prohibit their application for missions like EXIST.

Cadmium zinc telluride selenide (Cd1−xZnxTe1−ySey or CZTS) is one of the emerging CdTe-based semiconductor materials for detecting X- and gamma-ray radiation at or near room temperature (i.e., without cryogenic cooling).

Potential applications of CZTS sensors include medical imaging, X-ray detection, and gamma-ray homemadehattie.com by: 1. Preface Materials Research Society Symposium Proceedings Current Issues of High-Pressure Bridgman Growth of Semi-Insulating CdZnTe p.

3 Comparison Between Cadmium Zinc Telluride Crystals Grown in Russia and in the Ukraine p. 13 Modified Vapor-Phase Growth of. The goal of this project was to utilize a novel device design to build a compact, high resolution, room temperature operated semiconductor gamma ray sensor.

This sensor was constructed from a cadmium zinc telluride (CZT) crystal. It was able to both detect total radiation intensity and perform spectroscopy on the detected homemadehattie.com by: 2.

A wafer of bulk mercury cadmium telluride material and an HgCdTe detector were subjected to various temperature-pressure combinations to determine the extent of chemical decomposition under various conditions.

Residence time for each P-T combina- tion was 1 hour. Temperatures up to 55OOC and absolute pressures. Cadmium Zinc Telluride (CZT) is a wide band gap semiconductor for room temperature radiation detection.

The electro-optic Pockels effect of the material has been exploited in the past to study electric field non-uniformities and their consequence on conventional detector signals in. We worked closely with Dr.

Xuong's graduate students and trained them on radiation interactions and signal production in the detectors. PET imaging in medicine We participated on two projects: one was for the California Breast Cancer Research Program where we developed a proof-of-concept PET imaging system using our CZT detector technology.

Mann, “Improving Cadmium Zinc Telluride Spectrometer Performance and Capabilities“, Ph. Thesis, University of Michigan, W. Koehler, “Thallium Bromide as an Alternative Material for Room-Temperature Gamma-Ray Spectroscopy and Imaging“, Ph.

Thesis, Univerisity of Michigan, / Development of radiation dose reduction techniques for cadmium zinc telluride detectors in molecular breast imaging. Proceedings of SPIE - The International Society for Optical Engineering. Vol. Cited by: 5. Photovoltaic Mercury Cadmium Telluride Detectors µm Cutoff Room Temperature and Thermoelectrically Cooled PV MCT, One through Four Stages (TE) cutoff wavelength and response uniformity are all functions of temperature.

Detector temperature. Cadmium - Zinc - Telluride Imager (CZTI) is truly a hard X-ray imaging instrument in the energy range keV with a collecting area of cm homemadehattie.com is a solid state detector and the entire detector assembly is divided into four identical and independent quadrants.

Washington, DC: The National Academies Press. doi: / For example, one exciting new material, cadmium zinc telluride, now yields a room-temperature energy resolution of about % at keV. These new semiconductor detectors combined with optimized imaging geometries offer the prospect of major advances in the performance of.

May 24,  · CdZnTe (CZT) has made a significant impact as a material for room-temperature nuclear-radiation detectors due to its potential impact in applications related to Cited by: Cadmium Zinc Telluride (CZT) is a wide band gap semiconductor for room temperature radiation detection.

The electro-optic Pockels effect of the material has been exploited in the past to study electric field non-uniformities and their consequence on conventional detector signals in CZT, by imaging the intensity distribution of infrared (IR) light transmitted through a device placed between Author: A.

Lohstroh, I. Della Rocca, S. Parsons, A. Langley, C. Shenton-Taylor, D. Blackie. Ion Beam Induced Charge Collection (IBICC) is a proven albeit relatively new method to measure the electronic transport properties of room temperature radiation detectors.

Using an ion microbeam, the charge collection efficiency of CZT detectors can be mapped with submicron resolution and maps of the electron mobility and lifetime can be Cited by: 3.

When exposed to a radiation source (Am60 keV), the current flow in the circuit increased. The preliminary results indicate that the CZT nanowire arrays can be used as radiation detector materials at room temperature with a much low bias potential ( - V) as against - V applied to the bulk detector homemadehattie.com by: 3.

1 eV is a suitable candidate for the bottom cell and Cadmium Zinc Telluride (CZT) with a tunable bandgap of eV is a suitable candidate for the top cell. This work involves characterization of cadmium zinc telluride films and solar cells prepared by close spaced sublimation.

CZT is deposited by co-sublimation of CdTe and ZnTe. Cadmium Zinc Telluride (CdZnTe) is an important material for detectors used for national security. However, the production of CdZnTe, dominated by the High Pressure Bridgman technique for a decade, has suffered from low-yields (%) and small device sizes ( cm3).

The Cadmium Zinc Telluride (CZT) – Imager is one among the four X-ray instruments on ASTROSAT which covers a broad energy band of X-rays extending from 10 keV to keV. It has a large detection area of cm2 comprising of the CZT detector modules and uses an imaging process known as Coded Aperture Mask (CAM).Cadmium zinc telluride is an alloy of zinc telluride and cadmium telluride.

It has a high electro-optic coefficient and transparency in the mid-infrared region. It is a direct bandgap semiconductor used in a number of homemadehattie.com: Tellurex Corporation.Over the last decade, cadmium telluride (CdTe) and cadmium zinc telluride (CdZnTe) wide band gap semiconductors have attracted increasing interest as X-ray and gamma ray detectors.

Among the traditional high performance spectrometers based on silicon (Si) and germanium (Ge), CdTe and CdZnTe detectors show high detection efficiency and good room temperature performance and are well suited Cited by: