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Characterization of Structural Defects in (Cd,Zn)Te Crystals Grown by the Travelling Heater Method

Zou, Jiaona; Fauler, Alex; Senchenkov, Alexander S.; Kolesnikov, Nikolai N.; Kirste, Lutz; Kabukcuoglu, Merve Pinar. ORCID iD icon; Hamann, Elias; Cecilia, Angelica; Fiederle, Michael


Structural defects and compositional uniformity remain the major problems affecting the performance of (Cd, Zn)Te (CZT) based detector devices. Understanding the mechanism of growth and defect formation is therefore fundamental to improving the crystal quality. In this frame, space experiments for the growth of CZT by the Travelling Heater Method (THM) under microgravity are scheduled. A detailed ground-based program was performed to determine experimental parameters and three CZT crystals were grown by the THM. The structural defects, compositional homogeneity and resistivity of these ground-based crystals were investigated. A ZnTe content variation was observed at the growth interface and a high degree of stress associated with extensive dislocation networks was induced, which propagated into the grown crystal region according to the birefringence and X-ray White Beam Topography (XWBT) results. By adjusting the growth parameters, the ZnTe variations and the resulting stress were efficiently reduced. In addition, it was revealed that large inclusions and grain boundaries can generate a high degree of stress, leading to the formation of dislocation slip bands and subgrain boundaries. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000140170
Veröffentlicht am 19.11.2021
DOI: 10.3390/cryst11111402
Zitationen: 3
Zitationen: 3
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Photonenforschung und Synchrotronstrahlung (IPS)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2073-4352
KITopen-ID: 1000140170
HGF-Programm 56.12.11 (POF IV, LK 01) Materials - Quantum, Complex and Functional
Erschienen in Crystals
Verlag MDPI
Band 11
Heft 11
Seiten Article no: 1402
Vorab online veröffentlicht am 18.11.2021
Schlagwörter CZT; THM; structural defects; homogeneity; resistivity; birefringence; XWBT
Nachgewiesen in Dimensions
Web of Science
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