A team of Foundry staff and users harnessed sample design to optimize spatial resolution and brightness in cathodoluminescence (CL) microscopy for visualization of nanoscale buried interfaces.
Significance and Impact
This provides a comprehensive method to optimize encapsulated TMDs for CL imaging that will enable the study of buried structures in beam-sensitive materials like quantum dot superlattices or biological samples.
- The team focused on monolayer 2D semiconductor transition metal dichalcogenide (TMD) MoSe2 encapsulated in a hexagonal boron nitride (hBN) layer and determined the exciton diffusion in the hBN to be >200nm (first report).
- They optimized both spatial resolution and brightness of TMD emission by tuning the hBN thickness below 100 nm.
- Hyperspectral CL maps resolved spectrally distinct nanoscale features below diffusion-limited spatial resolution.