What is "homojunction"

n. (context physics English) A junction between two similar semiconductors

A homojunction is a semiconductor interface that occurs between layers of similar semiconductor material, these materials have equal band gaps but typically have different doping. In most practical cases a homojunction occurs at the interface between an n-type ( donor doped) and p-type ( acceptor doped) semiconductor such as silicon, this is called a p-n junction.

This is not a necessary condition as the only requirement is that the same semiconductor (same band gap) is found on both sides of the junction, in contrast to a heterojunction. An n-type to n-type junction, for example, would be considered a homojunction if the doping levels are different.

The different doping level will cause band bending, and depletion region will be formed at the interface, as shown in the right figure.