The use of Scanning-TCT where edge of the device is illuminated is called Edge-TCT. It is particularly useful techniques for studying the properties of the sample bulk when using a light of long penetration depth and studying of the edge properties with ligth of short penetration. It is a very powerful tool to study:
-electric field/velocity distribution inside the bulk even in the presence of high deep trap concentrations
-charge collection properties of the bulk
The edge-TCT usually requires the carefull sample preparation of the edge, polishing, in order to limit the difraction of light of long penetration depth. This is not required for exploring the edge properties of the samples.
List of related publications: