Category: 1. Electronic Devices

When we add a small quantity of impurity in a semiconductor than the impurity contributes either free electrons or holes to the semiconductor. As a result, the conducting property of semiconductor changes. The process of changing the conductive property of semiconductor by adding impurities is known as doping. Suppose, we add any pentavalent impurity in…

It is well known to us that the conductivity of a material depends on the concentration of free electrons in it. Good conductors consist large concentration of free electrons whereas insulators consist small concentration of free electrons. These conductors have a high conductance value (and hence a low resistance value). The concentration level of the…

Before understanding what is n-type semiconductor we should focus on some basic theories of atomic science. We all know that each atom of any substance requires eight electrons at its outermost orbit. But it is also true that all atoms do not have eight electrons at their outermost orbit. But all the atoms have an…

Semiconductor is a material whose conductivity lies in-between that of the conductors and the insulators. Semiconductors which are chemically pure, meaning free of impurities, are called Intrinsic Semiconductors or Undoped Semiconductor or i-type Semiconductor. The most common intrinsic semiconductors are Silicon (Si) and Germanium (Ge), which belong to Group IV of the periodic table. The…

The Physics of a Semiconductor There are some materials, which have neither good conductivity nor bad conductivity of electricity. They have a moderate range of electrical conductivity. The examples of such materials are germanium, silicon, carbon etc. As the conductivity of those materials lies between good conductors and insulators, and these materials are called semiconductors.…