Formula For Pn Junction Diode

Now let us examine the mode the diode current equation takes its form when we have the diode operating at room temperature. However unlike a resistor a diode does not behave linearly with respect to the applied voltage as the diode has an exponential current voltage i v relationship and therefore we can not described its operation by simply using an equation such as ohms law.

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Applying The Basic Equations To A Pn Junction Pveducation

A pn junction diode allows electric charges to flow in one direction but not in the opposite direction.

Formula for pn junction diode. The shockley diode equation relates the diode current of a p n junction diode to the diode voltage this relationship is the diode i v characteristic. On the other hand if the diode is reverse biased then the exponential term in equation 1 becomes negligible. As an example we now consider a silicon p n diode with n a 15 x 10 14 cm 3 and n d 10 14 cm 3.

A p n junction consists of two semiconductor regions with opposite doping type as shown in figure 421the region on the left is p type with an acceptor density n a while the region on the right is n type with a donor density n dthe dopants are assumed to be shallow so that the electron hole density in the n type p type region is approximately equal to the donor acceptor density. The diode equation is plotted on the interactive graph below. Silicon and germanium p n diodes usually satisfy this requirement while gallium arsenide p n diodes rarely do because of the short carrier lifetime and diffusion length.

Later he gives a corresponding equation for current as a function of voltage under additional assumptions which is the equation we call the shockley ideal diode equation. Large signal modelling shockley diode model. Thus the diode current equation equation 1 becomes.

The depletion region of the p n junction diode has high resistance. Change the saturation current and watch the changing of iv curve. Shockley derives an equation for the voltage across a p n junction in a long article published in 1949.

Negative charges electrons can easily flow through the junction from n to p but not from p to n and the reverse is true for holes. A pn junction diode is one of the simplest semiconductor devices around and which has the characteristic of passing current in only one direction only. When the pn junction is forward biased electric charge flows freely due to reduced resistance of the.

Note that although you can simply vary the temperature and ideality factor the resulting iv curves are misleading. Where is the saturation current or scale current of the diode the magnitude of the current that flows for negative in excess of a few typically 10 12 a. In a reverse biased p n junction diode the p type and n type regions have low resistance.

Hence p type and n type regions act like the electrodes or conducting plates of the capacitor.

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