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Development of High-Z Semiconductor Detectors and Their Applications to X-ray/Gamma-ray Astronomy

Abstract: Cadmium telluride (CdTe) has been regarded as a promising semiconductor material for hard X-ray and gamma-ray detection. The high atomic number of the material (48 and 52) gives a high quantum efficiency in comparison with silicon. Its large band-gap energy (~ 1.4 eV) allows us to operate the detector at room temperature. However, a considerable amount of charge loss in CdTe detectors causes degradation of energy resolution. This problem is due to the small mobility-lifetime product of carriers. Recently, significant improvements have been achieved to improve the spectral properties based on the advances in the production of crystals and in the design of electrodes. In this talk, I will present our recent progresses in CdTe-based detectors with an emphasis on our development of high resolution CdTe diodes. I will also talk on development of pixel devices and their applications to next-generation experiments for high energy astrophysics.
Speaker: Takaaki Tanaka - KIPAC
Speaker Bio: Takaaki Tanaka is a JSPS Postdoctoral Fellow at KIPAC/SLAC, working on high energy astrophysics. He has been involved in development of semiconductor detectors for hard X-ray detection and study of cosmic-ray acceleration in supernova remnants. He received his Ph.D. from University of Tokyo in 2007 for work on study of non-thermal X-ray emission from supernova remnants using data from a Japanese X-ray astronomy satellite, Suzaku. Currently, he is mainly working on GLAST mission.
Poster Link: Poster
Presentation: Presentation on 9/19/2007 (PDF)