05
Sep
Types Of Semiconductor In Chemistry. Thus the holes are the majority carriers while electrons are the minority carriers in P-type materials. For reference we will consider silicon as that is one of the most widely used materials in these junctions. In this article we shall have a brief idea of semiconductors. I n -type semiconductor.
Semiconductors can be divided into two groups. Science Chemistry Solid State Semiconductors On the basis of electrical conductivity substances can be classified into three types conductors insulators and semiconductors. Out of 5 valence electrons only 4 are involved in bond formation and the fifth electron is delocalized and can be easily provided to the conduction band. The impurity has more valence electrons than the host. Extrinsic semiconductors are doped which means some small amounts of impurities are added to improve conductivity. A semiconductor diode is a device typically made up of a single p-n junction.
The elemental semiconductors are those composed of single species of atoms such as silicon Si germanium Ge and tin Sn in column IV and selenium Se and tellurium Te in column VI of the periodic table.
The junctions which formed where n-type and p-type semiconductors are joined together is called pn junction. N-Type semiconductors are negative charge carriers. When voltage is applied to semiconductor devices electron current flows toward the positive side of the source and holes current flows towards the negative side of the source. P-Type semiconductors are positive charge carriers. The name extrinsic semiconductor can be a bit misleading. Extrinsic semiconductors are doped which means some small amounts of impurities are added to improve conductivity.