Posted on: November 17, 2010

•The band gap enables electrons to stay in the conduction band for long enough to be exploited.
•In a metal the continuum of available energy levels means that the electron would return to the ground state quickly.
•When an electron is promoted across a band gap it quickly decays to the lowest state in the conduction band but decay across the band gap is much slower.
–Thermalisation, Energy lost as heat.

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )


Connecting to %s




%d bloggers like this: