The Department of Physics Invites You To Attend An Honours Thesis Presentation By:
Supervisor: Dr. A. Reznik
Abstract: Cadmium zinc telluride (CZT) is currently the only single-crystalline photoconductor used in the direct conversion gamma-cameras due to its high sensitivity to x-rays and gamma-rays, good transport properties, high intrinsic energy resolution, wide band gap and mature technology. Currently, CZT-based single photon emission computed tomography (SPECT) gamma cameras are successfully used in oncology and cardiology where they demonstrate superior diagnostic capabilities, not achievable with indirect conversion SPECT technology. The high-energy resolution of CZT is also very promising for other spectroscopic applications including the emerging field of spectral Computed Tomography (CT). However, high flux operation rate typical in CT imaging puts stringent requirements on the detector performance and, most importantly, on the electron and hole drift mobilities. This research project aims to provide the detailed analysis of charge transport properties of CZT detectors provided by Redlen Technologies using time-of-flight (TOF) technique. Detailed measurements of electron and hole mobilities under varying applied electric fields and pulse intensities have been performed to ensure the desired performance at high flux applications. The effect of photogeneration rates on charge transport must be further analyzed with temperature controlled TOF experiments and x-ray characterization to understand the underlying mechanisms at play.
Tuesday, AUGUST 27, 2019 2:00 pm in ATAC 1005