Hierarchical microstructures in CZT

• Published in: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Vol. 652; no. 1; pp. 174 - 177
• Main Authors: Sundaram, S.K., Henager, C.H., Edwards, D.J., Schemer-Kohrn, A.L., Bliss, M., Riley, B.R., Toloczko, M.B., Lynn, K.G.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-10-2011
• Subjects: CdZnTe; Crystal growth; CZT; Detectors; Dislocations; Electron backscatter diffraction; Hierarchical; Infrared microscopy; Microscopy; Microstructure; Microstructures; Networks; Radiation detectors; Spectrometers; Tellurium precipitate; Twin boundaries; Crystal growth; Hierarchical; Twin boundaries; Electron backscatter diffraction; CdZnTe; Infrared microscopy; Tellurium precipitate; Microstructures
• ISSN: 0168-9002; 1872-9576
• DOI: 10.1016/j.nima.2010.09.128

Advanced characterization tools, such as electron backscatter diffraction and transmitted IR microscopy, are being applied to study critical microstructural features and orientation relations in as-grown CZT crystals to aid in understanding the relation between structure and properties in radiation detectors. Even carefully prepared single crystals of CZT contain regions of slight misorientation, Te-particles, and dislocation networks that must be understood for more accurate models of detector response. This paper describes initial research at PNNL into the hierarchy of microstructures observed in CZT grown via the vertical gradient freeze or vertical Bridgman method at PNNL and WSU.