Carbon nanotube

Field emission

Secondary electron emission(SEE)

Quantum Dot Sensitized solar cell

Photo-CELIV

Photoelectronic materials

Silicon solar cell

Photo sensor

wetting

 
 
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Secondary electron emission(SEE)

Process of SEE
1. Generation of excited electrons in solid (primary ionization)
2. Transport through the solid including cascade multiplication.
3. Escape of some of the electrons into vacuum.
 

In general, metals and semiconductors are relatively poor secondary electron emitters while insulators are good secondary electron emitters.