Question

If the lattice constant of this semiconductor is decreased, then which of the following is correct?

Options

• All E_c, E_g, E_v increase

• E_c and E_v increase, but E_g decreases

• E_c and E_v decrease, but E_g increases

• All E_c, E_g, E_v decrease

Answer 1

E_c and E_v decrease, but E_g increases

Explanation:

A crystal structure is made up of unit cells, which are groups of atoms arranged in a specific pattern and are repeated in three dimensions on a lattice. The lattice parameters or constants are the spacing between unit cells in various orientations. By increasing these lattice constants, the band-gap (E_g) will widen, requiring more energy from electrons to enter the conduction band from the valence band. E_e and E_v lower automatically.