The semi conductor diode has the property of a:

Explanation

A diode is a circuit element that allows electric current to flow in only one direction, like a one-way valve . A diode is created by joining a p-type semiconductor to an n-type semiconductor. The junction between these materials is called a p-n junction. . The positions of the valence and conduction bands are the same, but the impurity levels are quite different. When a p-n junction is formed, electrons from the conduction band of the n-type material diffuse to the p-side, where they combine with holes in the valence band. This migration of charge leaves positive ionized donor ions on the n-side and negative ionized acceptor ions on the p-side, producing a narrow double layer of charge at the p-njunction called the depletion layer. The electric field associated with the depletion layer prevents further The junction between these materials is called a p-n junction. . The positions of the valence and conduction bands are the same, but the impurity levels are quite different. When a p-n junction is formed, electrons from the conduction band of the n-type material diffuse to the p-side, where they combine with holes in the valence band. This migration of charge leaves positive ionized donor ions on the n-side and negative ionized acceptor ions on the p-side, producing a narrow double layer of charge at the p-njunction called the depletion layer. The electric field associated with the depletion layer prevents further diffusion.