Engineering Hybrid Perovskite Materials for Spectroscopic Sensing of Ionizing Radiation

Eric Lukosi^a^,^b, Jeremy Tisdale^b^,^c, Travis Smith^a^,^b, Ryan Tan^a^,^b, Bogdan Dryzhakov^b^,^c, Andrew Shayotovich^a^,^b, Andrew Naylor^a^,^b, Kate Higgins^b^,^c, Jessica Charest^a^,^b, Bin Hu^b^,^c, Mahshid Ahmadi^b^,^c

^aDepartment of Nuclear Engineering, University of Tennessee, US, Knoxville, Tennessee 37996, EE. UU., Knoxville, United States

^bJoint Institute for Advanced Materials, University of Tennessee, US, Knoxville, Tennessee 37996, EE. UU., Knoxville, United States

^cDepartment of Materials Science Engineering, University of Tennessee, US, Knoxville, Tennessee 37996, EE. UU., Knoxville, United States

Materials for Sustainable Development Conference (MATSUS)
Proceedings of nanoGe Fall Meeting19 (NFM19)

#RadDet19. Radiation Detection Semiconductors Materials, Physics and Devices

Berlin, Germany, 2019 November 3rd - 8th

Organizers: Mahshid Ahmadi and Germà Garcia-Belmonte

Invited Speaker, Eric Lukosi, presentation 244
DOI: https://doi.org/10.29363/nanoge.nfm.2019.244
Publication date: 18th July 2019

Methylammonium lead halide hybrid perovskite semiconductors are a potential low-cost option for moderate energy resolution semiconductor detectors for gamma and neutron sensing. However, their chemical/environmental instabilities and ionic conductivity are significant challenges that must be overcome, and the ability to consistently reproduce sufficient material quality for spectroscopic gamma sensing has not yet been achieved. In this presentation, we will report on several experiments aimed at better understanding the pertinent electronic properties of methylammonium lead halide hybrid perovskites. Methods include direct charge transient measurements using alpha particles, photo-Hall electron spectroscopy, the transient current technique, time-resolved photoluminescence, and the effect of precursor purity used for growth. With these methods, we have identified the drift mobility, trapping time constant, detrapping time constant, and trap cross section for holes in CH₃NH₃PbBr₃. Further, the shallow and deep energy levels within the band gap have been identified, providing insight into the causes of trap-controlled conductivity and non-radiative recombination mechanisms. Finally, it was found that particle size on the nucleation surface increased by as much as a factor of five when using higher purity precursors with a corresponding increase in charge carrier transport properties. Using alpha particles, the signal amplitude increased by as much as 30%, and using time-resolved photoluminescence, the radiative recombination lifetime increased by two orders of magnitude.

Acknowledgements:

This material is based upon work supported by the U.S. Department of Homeland Security under grant no. 2016-DN-077-ARI01. Part of this work was conducted in the Micro-Processing Research Facility, a University of Tennessee Core Facility. Part of this work was conducted at the Center for Nanophase Materials Science, and DOE User Facility. Disclaimer: The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the U.S. Department of Homeland Security.

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