N_Diode_N3 - Diodes (03) Electronic Devices and Circuit...

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1 Diodes (03) Electronic Devices and Circuit Theory : 9 th Edition By Robert Boylestad & Louis Nashelsky
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2 REAL DlODE OR SILICON DIODE The term conductor is applied to any material that will support a generous flow of charge when a voltage source of limited magnitude is applied across its terminals. An insulator is a material that offers a very low level of conductivity under pressure from an applied voltage source. A semiconductor , therefore, is a material that has a conductivity level somewhere between the extremes of an insulator and a conductor. SEMICONDUCTOR MATERIALS
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REAL DlODE OR SILICON DIODE n-Type Material Both the n- and p-type materials are formed by adding a predetermined number of impurity atoms into a silicon (or germanium) base. The n-type is created by introducing those impurity elements that have five valence electrons (pentavalent), such as antimony, arsenic, and phosphorus. The effect of such impurity elements (e.g. using antimony as the impurity in a silicon base), in addition to the four covalent bonds now, there is an additional fifth electron due to the impurity atom. This electron is unassociated with any particular covalent bond. This electron
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N_Diode_N3 - Diodes (03) Electronic Devices and Circuit...

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