Editing Superlattice (section)

== Semiconductor superlattice types ==

Superlattice miniband structures depend on the [[Heterojunction|heterostructure]] type, either ''type I'', ''type II'' or ''type III''. For type I the bottom of the [[conduction band]] and the top of the valence subband are formed in the same semiconductor layer. In type II the conduction and valence subbands are staggered in both real and [[reciprocal space]], so that electrons and holes are confined in different layers. Type III superlattices involve [[semimetal]] material, such as HgTe/[[CdTe]]. Although the bottom of the conduction subband and the top of the valence subband are formed in the same semiconductor layer in Type III superlattice, which is similar with Type I superlattice, the band gap of Type III superlattices can be continuously adjusted from semiconductor to zero band gap material and to semimetal with negative band gap.

Another class of quasiperiodic superlattices is named after [[Fibonacci]]. A Fibonacci superlattice can be viewed as a one-dimensional [[quasicrystal]], where either electron hopping transfer or on-site energy takes two values arranged in a [[Fibonacci sequence]].