I know what an exciton is, but I can't really understand why having a large exciton BE would be good for a material to be used in photochemical reactions...
Answer:
First let’s define a couple of things:
An exciton is a bound state of an electron and an electron hole (an imaginary particle in an insulator or semiconductor).
Binding energy is the mechanical energy required to disassemble a whole into separate parts.
So, exciton binding energy, aka “kT “, is the mechanical energy required to separate and electron from the electron hole.
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