Residual strain was found to locally degrade stability and shift optical photoluminescence in halide perovskites.
Significance and Impact
The nanostructural origins of optical performance and photo-stability were directly observed using nanoscale x-ray microscopy - informing new routes for strain engineering of emergent optoelectronic materials.
- Perovskite CsPbBr3 thin film single crystals were prepared by a fast crystallization process of spin-casting and annealing
- Structural and chemical imaging were performed by nanoscale synchrotron x-ray fluorescence and scanning diffraction microscopy using the joint CNM/APS nanoprobe, and correlated with ex-situ photoluminescence mapping at UCSD
- The x-ray nanobeam also was used as a tunable source of photochemical degradation to directly assess local structural stability
Work was performed in part at the Center for Nanoscale Materials and Advanced Photon Source.
About Argonne’s Center for Nanoscale Materials
The Center for Nanoscale Materials is one of the five DOE Nanoscale Science Research Centers, premier national user facilities for interdisciplinary research at the nanoscale supported by the DOE Office of Science. Together the NSRCs comprise a suite of complementary facilities that provide researchers with state-of-the-art capabilities to fabricate, process, characterize and model nanoscale materials, and constitute the largest infrastructure investment of the National Nanotechnology Initiative. The NSRCs are located at DOE’s Argonne, Brookhaven, Lawrence Berkeley, Oak Ridge, Sandia and Los Alamos National Laboratories. For more information about the DOE NSRCs, please visit https://science.osti.gov/User-Facilities/User-Facilities-at-a-Glance.
About the Advanced Photon Source
This research used resources of the Advanced Photon Source, a U.S. DOE Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.
Argonne National Laboratory seeks solutions to pressing national problems in science and technology. The nation’s first national laboratory, Argonne conducts leading-edge basic and applied scientific research in virtually every scientific discipline. Argonne researchers work closely with researchers from hundreds of companies, universities, and federal, state and municipal agencies to help them solve their specific problems, advance America’s scientific leadership and prepare the nation for a better future. With employees from more than 60 nations, Argonne is managed by UChicago Argonne, LLC for the U.S. Department of Energy’s Office of Science.
The U.S. Department of Energy’s Office of Science is the single largest supporter of basic research in the physical sciences in the United States and is working to address some of the most pressing challenges of our time. For more information, visit https://energy.gov/science.