Annual Report: Property Improvement in CZT via Modeling and Processing Innovations

Henager, Charles H. ; Setyawan, Wahyu ; Gao, Fei ; Hu, Shenyang Y. ; Bliss, Mary ; Riley, Brian J. ; Alvine, Kyle J. ; Stave, Jean A.

关键词: modeling and simulation;    CZT;    crystal growth;    tellurium;   

DOI  :  10.2172/1170117
RP-ID  :  PNNL-22869
PID  :  OSTI ID: 1170117
Others  :  Other: NN2001000

美国|英语

来源: SciTech Connect

【 摘 要 】

The objective of this project is to develop growth models of CZT crystals from the melt using vertical gradient freeze (VGF) or vertical Bridgman growth as a typical process. Further, the project will perform critical experiments including single crystal growth to validate the growth models and to provide detailed data for modeling and simulation. Ideally, the project will develop growth models that will provide, for the first time, choices for optimal CZT single crystal growth from the melt based on model input. The overarching goal that guides this research proposal is to produce large, single crystals of CZT with good yield and reproducible properties. In our view this depends on 1) understanding crystal growth processes, including annealing and cool-down processing, and 2) understanding the role of defects on detector response since it is not possible, yet, to produce defect-free materials. Models of defect structure and formation are addressed. Validated models and experiments on reducing defects in melt-grown crystals are used to guide our understanding of growth processes and in-furnace annealing plus cool-down.