1-37The CONDUCTION PROCESS in a SEMICONDUCTOR is accomplished by two different typesof current flow: HOLE FLOW and ELECTRON FLOW. Hole flow is very similar to electron flowexcept that holes (positive charges) move toward a negative potential and in an opposite direction to thatof the electrons. In an INTRINSIC semiconductor (one which does not contain any impurities), thenumber of holes always equals the number of conducting electrons.DOPINGis the process by which small amounts of selected additives, called impurities, are addedto semiconductors to increase their current flow. Semiconductors that undergo this treatment are referredto as EXTRINSIC SEMICONDUCTORS.An N-TYPE SEMICONDUCTOR is one that is doped with an N-TYPE or donor impurity (animpurity that easily loses its extra electron to the semiconductor causing it to have an excess number of
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business