Diodes and diode circuits tlt8016 basic analog circuits 20052006 20 3. The objective of this experiment is to measure the iv curve for pn junction diode and to understand the characteristics of pn junction. This video will clear provide clear understanding of pn junction and its working and properties of forward and reverse biasing by dilip kumar m from vidyaniketan college hubli, karnataka. You will figure them out as we go further in the lecture. Basic electronics pn junction forward and reverse bias.
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. With the ideal diode equation now understood, we can begin to analyze pn. In the forward bias, the diode allows the current to flow in unidirection. Doping with acceptor creates p type semiconductor while doping with donors produces n type. Each type has its own symbol but the basic design remains the same. Pn junction diodes form the basis not only of solar cells, but of many other electronic devices such as leds, lasers, photodiodes and bipolar junction transistors bjts. Following is the electrical symbol of a pn junction diode. The occurrence of an intrinsic layer can significantly increase the breakdown voltage for the application of highvoltage.
In fact, a pn junction diode alone can act as a primitive photovoltaic device, because its internal electric field separates light generated electronhole pairs. Learning the basics of a diode easy and quick explanation. After the pn junction diode was developed in the year 1940s, the diode was first exercised as a highpower rectifier, lowfrequency during the year 1952. A pn junction aggregates the recombination, generation, diffusion and drift effects described in the previous pages into a single device. Its made up from a small piece of semiconductor material usually silicon, it allows the electric current to flow in one direction while opposes the current in other direction. In this physics digital electronics video lecture in hindi for class 12 we explained forward and reverse bias in pn junction diode in terms of depletion layer and potential barrier. The boltzmann approximation is to say that the resulting current being small compared with the components of. A pn junction diode is a two terminal single crystal semiconductor device whose one side is doped with acceptors and other side by donors.
Pn junction diode, characteristics and applications 2020. The pn junction is the most fundamental component of a solar cell. However, unlike a resistor, a diode does not behave linearly with respect to the applied voltage as the diode has an exponential currentvoltage. When a section of ptype material and a section of ntype material are brought in contact to form a pn junction, a number of interesting properties arise. It is the first step in learning diode basics to identify the symbol of a diode and remember it. Behaviors of the pn junction engineering libretexts. Pin diode basics, working and applications elprocus. The diffusion forms a dipole charge layer at the pn junction interface. Electrons and holes diffuse from areas of high concentration toward areas of low concentration. The pin diode is an alteration of the pn junction for particular applications. There is a builtin voltage at the pn junction interface that prevents penetration of electrons into the pside and holes into the nside. Pn junction underbiasing 14 boltzmanns approximation.