Dissertation/Thesis Abstract

Strategies and Challenges to Improve Single Crystal Yield and Detector Properties of Cadmium Zinc Telluirde Grown Via Accelerated Crucible Rotation
by Kakkireni, Saketh, Ph.D., Washington State University, 2020, 164; 28028540
Abstract (Summary)

Solid-state radiation detection finds its applications in numerous fields ranging from nuclear medicine to astrophysics. Although Semiconductors offer better energy and spatial resolution than Scintillators, their market share is limited by the cost, availability and need for cryogenic cooling. Cadmium Zinc Telluride (CZT) is a compound semiconductor with attractive properties for compact device technology for detection of X-rays and Gamma-rays. Over the past few decades’ numerous efforts are made to grow high-quality CZT, unfortunately to-date it’s application is limited by large-scale production and cost. Poor thermo-physical properties of CZT coupled with no strong growth direction make it a challenge to achieve high yield of single crystalline material. Current industrial flux growth technique is inherently limited by slow growth rates and requires post-processing. The solution may be found in the Accelerated Crucible Rotation Technique (ACRT), where the crystal growth is achieved under a forced convective regime involving periodic rotation of the growth crucible. ACRT induced flow patterns can homogenize the melt thereby enabling faster growth rates and eliminate the need for post-processing. Our preliminary results, presented here, show that ACRT can reduce the production time by a factor of four. Additionally, the application of ACRT has provided the potential for scale up the growth process. Also discussed are challenges and future strategies in ACRT coupled CZT growth. Successful completion of this work will enable the use of CZT in the next generation imaging systems as well as provide a better foundation for understanding and implementing ACRT in other crystal growth systems. Successful seeding and superior detector resolutions are demonstrated.

Indexing (document details)
Advisor: McCloy, John S.
Commitee: Matveev, Konstantin, Field, David P.
School: Washington State University
Department: Mechanical Engineering
School Location: United States -- Washington
Source: DAI-B 82/5(E), Dissertation Abstracts International
Subjects: Mechanical engineering, Information Technology, Industrial engineering, Nuclear physics
Keywords: ACRT, Cadmium ZInc Telluride, Radiation detection, Seeded growth, Solid-state radiation, Compact device technology
Publication Number: 28028540
ISBN: 9798698542957
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