Seminar | Crystal Growth and Characterization of CdTe for Radiation Detectors

When: Tuesday Aug 27, 15.00-16.00
Location: Seminar room FA32, Albanova Main building, 3rd floor,
Roslagstullsbacken 21, Stockholm
Videoconference: https://lnkd.in/dQAneyz9

About: CdTe-based semiconductors are the best materials for preparing room temperature spectrally sensitive detectors of high energy radiation. They are used in various medical applications, security, non-destructive testing, space research, etc. In this talk, Professor Roman Grill reports on the achievements and knowledge he and his colleagues have gathered during more than 30 years of CdTe research at the Institute of Physics, Charles University. Basic principles of operation of radiation detectors are presented and the required material properties are defined to meet strict criteria set for high-quality detectors. The entire production line is commented on, starting with the growth of single crystals followed by after-growth annealing, material characterization, detector manufacture, and testing. Theoretical concepts describing all processes will be outlined. Throughout the talk, Roman Grill will emphasize problems unsolved so far that critically limit the production yield and cause the high price of detectors. Particularly, the talk encompasses the following topics: CdTe phase diagram, point defect engineering and self-compensation, chemical diffusion, contactless resistivity mapping, bias- and light-induced space charge formation and sensor polarization, transient current technique, and specific contact designs in sensors.