What is the difference between the SE and BSE modes of scanning electron microscopy?

1. The collected signals are different.

• SE: secondary electron;

• BSE: backscattered electron.

2. The resolution is different. 

• SE: high; 

• BSE: low.

3. The image contrast is different. 

• SE: Topographic contrast; 

• BSE: Thickness contrast.

4. The purpose of application is different. 

• SE: onlookers three-dimensional morphology; 

• BSE: two-dimensional distribution of elements and phases.