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NE Colloquium: Lei Raymond Cao

Title: "Development of Perovskite Radiation Detectors."

Wide band-gap (WBG) semiconductors offer stability, endurability, and room temperature operation than those narrow band-gap semiconductors such as Si and Ge detectors. One example of most developed WBG is the well-known CZT detector. One emerging WBG is lead halide perovskites that show a great potential in X- and gamma-rays detection with a desirable high attenuation coefficient, a wide band gap energy, and a large mobility-lifetime product. The all-inorganic CsPbBr3 perovskite has its own advantages due to the structural stability over the organic-inorganic perovskites.

Lei Raymond Cao reports the performance of gamma-ray detectors made of solution-grown CsPbBr3 single crystals by Jinsong Huang’s group at University of North Carolina at Chapel Hill. Cao is able to produce energy spectra from Cs-137 button source with FWHM resolution at 5.5 - 11% @ 662keV, and Peak-to-Compton valley ratio at 2. Low leakage current has been consistently achieved (~2-5nA@-200V), comparable to a commercial CZT detector. Excellent reproducibility and stability are also demonstrated.

Lei Raymond Cao is professor and director of the Nuclear Engineering Program at The Ohio State University (OSU). He also serves as the director of OSU-Nuclear Reactor Lab. Cao received his BS degree in experimental nuclear physics from Lanzhou University in 1994 and his PhD from Nuclear and Radiological Engineering Program at University of Texas at Austin in 2007. Prior to joining OSU in 2009, he was a research associate at Positron Emission Tomography lab at Harvard Medical School and then at the Center for Neutron Research, National Institute of Standards and Technology (NIST) at Maryland.

His major research interests focus on nuclear instrumentation and sensor development, in-pile instrumentation, neutron radiography, and nuclear analytical technologies. Cao has published ~ 100 articles in journal and conference proceedings and serves as associate editor for IEEE Transactions on Nuclear Science.

Dial-In Information

Zoom Meeting ID: 933 9681 2886
Password: 743022

Wednesday, September 9, 2020 at 1:30pm to 2:30pm

Virtual Event
Event Type

Lectures & Presentations




Current Students, Faculty & Staff, Alumni, Prospective Students


NE Colloquium, NE Fall 2020


Nuclear Engineering
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