The Fall 2022 MatSE 590 for graduate students consists of an exciting and jam-packed schedule. MATSE 590 is a colloquium (1-3 credits) consist of a series of individual lectures by faculty, students, or outside speakers.
Graduate students will receive a weekly email with information via @psu.edu email. Graduate students are required to attend all 590 Seminars. If you have any questions, please email GradOffice@matse.psu.edu.
September 22, 2022
“Radiation Detection using Perovskites – from Materials to Devices”
Paul Sellin, Professor of Physics, Department of Physics, University of Surrey, UK
Abstract
Perovskites are a fascinating and varied class of materials that have recently been applied for use as sensor for ionising radiation. Having been widely developed by the PV and solid-state lighting communities, perovskites have many electronic and optical properties that make them very well suited for use as radiation detectors. Of particular interest are lead halide perovskites where the presence of high‐Z atoms such as Cs and Pb provides good X‐ray and gamma ray efficiency, combined with good charge transport, and/or scintillation properties. These materials can also be fabricated using relatively straightforward solution processing methods and can be used as both semiconductor ‘direct’ detectors, and as ‘indirect’ scintillation detectors. For direct detection, particularly rapid progress has been made for X‐ray imaging detectors, where perovskite detectors have demonstrated excellent x‐ray sensitivity, stability, and imaging performance. The use of perovskites as energy‐resolving gamma ray detectors has also developed strongly, and recent results using the highest quality single‐crystal perovskites have shown high mobility‐lifetime products that are capable of high resolution gamma spectra from sources such as 137Cs. Most recently several news types of ‘lead free’ double perovskite materials have demonstrate extremely high light yield as scintillators, combining high light yields with exceptionally large Stoke shifts. In this talk I will present an overview of the latest results from my group on perovskite radiation detectors, including both direct detection with single crystal and polycrystalline lead halide materials, and next generation radiation scintillators using various double perovskite materials.
Biographical Information
Paul Sellin is a Professor of Physics at the University of Surrey (UK) specializing in the development of new materials for radiation detection. He has worked for more than 30 years in this field, initially concentrating on the development of wide bandgap semiconductors such as CdTe, CZT, SiC, and diamond for use as radiation sensors. His group is now focused on the synthesis and characterization of metal halide and ‘lead free’ double perovskite materials for use as radiation detectors, both as direct charge-based detectors and as perovskite scintillators.