Learning outcomes - after studying this topic, you should be able to:

• explain how band structure in insulators, semiconductors and metals arise from delocalised orbitals
• describe the characteristics of natural and doped semiconductors, including band-gap energy
• explain how semiconductors are used in solar energy collection and conversion
• describe chemical vapour deposition, and how it can be used to build up layers of different composition.

• Sections 7.2 and 7.8 (in Blackman, Bottle, Schmid, Mocerino and Wille, Chemistry, 3^rd Edition, 2015 (John Wiley))

Intro to energy bands