Cathodoluminescence is based on the emission of light upon electron beam excitation. An incident electron beam, coming from a SEM, hit the sample surface. Interaction of electrons and the matter, following various relaxation processes, can generate electron/hole pairs that can recombine and generate photons.
The intensity and spectral content of the emitted light is a direct measure of important material properties such as bandgap energy, impurity, structural defects, crystallinity, …
Luminescence, scanning electron microscopy, electron-hole recombination, radiative recombination
The cathodoluminescence microscope is an Attolight system equipped with:
- FEG electron gun
- Field of view
- From 100×100 nm2 up to 150×150 µm2
- Sample holder
- ∅1 inch diameter
- Liquid helium cryostat
- With temperature controller (5K-300K)
- Detectors spectral range
- UV visible CCD
- NIR InGaAs photodiode array
- Spectrometer and gratings (groves/mm@blaze)
- 320mm focal length
- Nano for Quantum Technologies
- Disruptive Devices
- Advanced Integration
Key Enabling Technologies
- Metrology / Characterisation: Physical
Users are trying to measure the spatial variation of the emission spectrum of their sample to characterize the material or device properties at the µm scale (from (50nm to 100µm).
They should define if the electron beam can reach the region of interest inside the sample (depth). The expected emission bands should have to be inside the detection range of the equipment. The sample size have to be compatible with the sample holder (<1″).
Such characterization can be use in the case of III-V nano and/or stack materials characterization, light emitting diodes and other optoelectronic devices