Two semiconductors forming a heterostructure will not necessarily have Type I band alignment. Below are three different cases where individual band diagrams for two different semiconductors are given. For each of the cases, sketch the equilibrium band diagrams when an N-p heterojunction is formed between the two, clearly showing the conduction and valence band offsets. Electron affinities (qχ) and Fermi levels (EF) are indicated on the diagrams. Explain for each case how efficiently the single heterostructure would work as an LED.

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Explanation:

Electron affinity can be defined as the change in energy (in kJ/mole) of a neutral atom which may be in the gaseous phase when an electron is added to the atom to form a negative ion. In other words, the neutral atom's likelihood of gaining an electron.

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