Nanoscale variations of crystal polytype, strain and com-position in ternary (In,Ga)As quantum well nanostructures locally shift cathodoluminescence emission energy.
Significance and Impact
Crystal structure was found to have a role in tuning quantum well emission. Combining electron, X-ray and atom probe microscopy demonstrates a unique route for advanced nanoscale characterization of photonic heterostructures.
- Cathodoluminescence hyperspectral imaging revealed a blue-shift of emission energy in core-shell quantum well nanowires.
- This shift was correlated with a local shift of indium revealed by atom probe tomography at Northwestern, and the presence of wurtzite/zincblende polytypes and local lattice strain were identified by the Center for Nanoscale Materials (CNM)/Advanced Photon Source (APS) Hard X-ray Nanoprobe.
Work was performed in part at CNM and APS.
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.
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