Control of the polytypes and line defects in radiation detector materials

2012 ◽  
Author(s):  
N. B. Singh ◽  
W. M. B. Duval ◽  
R. H. Hopkins ◽  
R. Mazelsky ◽  
D. K. Fox ◽  
...  
Keyword(s):  
Radiation Detector ◽  
Line Defects ◽  
Detector Materials

Large-size CdZnTe (Zn=10%) radiation detector materials and device performance

2004 ◽  
Author(s):  
Longxia Li ◽  
Fengying Lu ◽  
Chun Lee ◽  
Marc Black ◽  
Ralph B. James ◽  
...  
Keyword(s):  
Radiation Detector ◽  
Device Performance ◽  
Large Size ◽  
Detector Materials

First-principles study of defects and carrier compensation in semiconductor radiation detector materials

2009 ◽  
Vol 1164 ◽  
Author(s):  
Mao-Hua Du ◽  
Hiroyuki Takenaka ◽  
David Joseph Singh
Keyword(s):  
Hydrogen Atom ◽  
Fermi Level ◽  
First Principles ◽  
Radiation Detector ◽  
Defect Engineering ◽  
Fermi Level Pinning ◽  
Excellent Candidate ◽  
Anion Site ◽  
Defects And Impurities ◽  
Detector Materials

AbstractWe discuss defect engineering strategies in radiation detector materials. The goal is to increase resistivity by defect-induced Fermi level pinning without causing defect-induced reductions in the carrier drifting length. We show calculated properties of various intrinsic defects and impurities in CdTe. We suggest that the defect complex of a hydrogen atom and an isovalent impurity on an anion site may be an excellent candidate in many semiconductors for Fermi level pinning without carrier trapping.

Radiation detector materials: An overview

2008 ◽  
Vol 23 (10) ◽  
pp. 2561-2581 ◽  
Author(s):  
B.D. Milbrath ◽  
A.J. Peurrung ◽  
M. Bliss ◽  
W.J. Weber
Keyword(s):  
Homeland Security ◽  
Performance Metrics ◽  
Materials Science ◽  
Radiation Detector ◽  
Radiation Detection ◽  
National Defense ◽  
Challenges And Opportunities ◽  
Science Community ◽  
Faster Development ◽  
Detector Materials

Due to events of the past two decades, there has been new and increased usage of radiation-detection technologies for applications in homeland security, nonproliferation, and national defense. As a result, there has been renewed realization of the materials limitations of these technologies and greater demand for the development of next-generation radiation-detection materials. This review describes the current state of radiation-detection material science, with particular emphasis on national security needs and the goal of identifying the challenges and opportunities that this area represents for the materials-science community. Radiation-detector materials physics is reviewed, which sets the stage for performance metrics that determine the relative merit of existing and new materials. Semiconductors and scintillators represent the two primary classes of radiation detector materials that are of interest. The state-of-the-art and limitations for each of these materials classes are presented, along with possible avenues of research. Novel materials that could overcome the need for single crystals will also be discussed. Finally, new methods of material discovery and development are put forward, the goal being to provide more predictive guidance and faster screening of candidate materials and thus, ultimately, the faster development of superior radiation-detection materials.

Data-Driven Exploration of the Ionization-Phonon Partitioning in Scintillating Radiation Detector Materials

2008 ◽  
Vol 55 (3) ◽  
pp. 1042-1048 ◽  
Author(s):  
Kim F. Ferris ◽  
Bobbie-Jo M. Webb-Robertson ◽  
David V. Jordan ◽  
Dumont M. Jones
Keyword(s):  
Radiation Detector ◽  
Data Driven ◽  
Detector Materials

Materials Aspects of Germanium Radiation Detector Fabrication

1982 ◽  
Vol 16 ◽  
Author(s):  
G. Scott Hubbard
Keyword(s):  
High Purity ◽  
Present Status ◽  
Operating Characteristic ◽  
Radiation Detector ◽  
Radiation Detectors ◽  
Complete Dominance ◽  
Active Point ◽  
High Purity Germanium ◽  
Line Defects ◽  
And Storage

ABSTRACTAn overview of the present status and future requirements of material for germanium radiation detectors is presented. Fabrication and storage problems for both lithium-drifted, doped germanium and high-purity germanium are compared to demonstrate the reasons for the recent complete dominance of the latter in commercially available radiation detectors. The effect of electrically active point and line defects on the resolution and operating characteristic of high-purity germanium radiation detectors is discussed. Emphasis is placed on deep impurities and dislocations. Present and future applications of high-purity germanium radiation detectors are reviewed.

Computational Models for Crystal Growth of Radiation Detector Materials: Growth of CZT by the EDG Method

2007 ◽  
Vol 1038 ◽  
Author(s):  
Jeffrey J. Derby ◽  
David Gasperino
Keyword(s):  
Crystal Growth ◽  
Computational Models ◽  
Radiation Detector ◽  
Radiation Detection ◽  
Radiation Detectors ◽  
Growth Conditions ◽  
Detector Performance ◽  
Detection Systems ◽  
Crystal Properties ◽  
Detector Materials

AbstractCrystals are the central materials element of most gamma radiation detection systems, yet there remains surprisingly little fundamental understanding about how these crystals grow, how growth conditions affect crystal properties, and, ultimately, how detector performance is affected. Without this understanding, the prospect for significant materials improvement, i.e., growing larger crystals with superior quality and at a lower cost, remains a difficult and expensive exercise involving exhaustive trial-and-error experimentation in the laboratory. Thus, the overall goal of this research is to develop and apply computational modeling to better understand the processes used to grow bulk crystals employed in radiation detectors. Specifically, the work discussed here aims at understanding the growth of cadmium zinc telluride (CZT), a material of long interest to the detector community. We consider the growth of CZT via gradient freeze processes in electrodynamic multizone furnaces and show how crucible mounting and design are predicted to affect conditions for crystal growth.

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