working of pn junction diode pdf

View Notes - Chapter 06_PN Junction Diode.pdf from ELECTRICAL E239 at Information Technology University of the Punjab, Lahore. Semiconductor PN Junction Diode is the simplest semiconductor device. PN junction Diode plays a vital role in our electronic fields, because of their unique property (current flows in only one direction) they are used in many electronic or electrical circuits like rectifiers, switches, clippers, clampers, voltage multipliers.. 13 40 30 20 10 40 Forward Bias Region 140 V (volts) 120 80 0.4 2 6 0.8 12 V (volts) Reverse Bias Region Figure 5.1: Diode Characteristics Connect the circuit as shown in figure (1) using silicon PN Junction diode. Small signal model of the diode: capacitances • Capacitance associated to charges • 2 types of charges present in the junction • Fixed charges (ionised dopants) in depletion layer • Mobiles (e-et h+) injected when forward biasing • 2 types of capacitance • Junction (or Transition) Capacitance • … 2. 193 0 obj <>/Filter/FlateDecode/ID[<0671DA3F26F53149BCAB0F7E8E28881F><3B80F7E756D1BF44AA9A478DB369DECB>]/Index[179 33]/Info 178 0 R/Length 73/Prev 149595/Root 180 0 R/Size 212/Type/XRef/W[1 2 1]>>stream Because of this, the number of negative ions in the P-region and positive ions in the N-region increases. But, in practice, a very small current of the order of few micro amperes flows in the reverse direction. Hence, the potential barrier as well as the width of the depletion region are reduced. But today also the most commonly used diode is a semiconductor diode. Hence the depletion region becomes wider and the potential barrier is increased. The term PIN diode gets its name from the fact that includes three main layers. The word diode can be explained as ‘Di’ means two and ‘ode’ is obtained from electrode. When the PN junction is reverse biased (Fig), electrons in the N region and holes in the P-region are attracted away from the junction. In the case of reverse voltage, a small amount of reverse current will flow through P-N junction. Semiconductor (pn-Junction) Diodes Physically, diodes are formed by the interface between two regions of oppositely doped semiconductor (i.e., pn junction) and are thus, structurally, the simplest semiconductor devices used in electronics. Static GK topics for Competitive Exams – Check Static GK Competitive Exams || Download Study Materials Here!!!! 179 0 obj <> endobj If an external potential is applied to the terminals of PN junction, it will alter the potential between the P and N-regions. This generates hole and electron pairs. During this process, the electrons crossing the junction from N-region into the P region, recombine with holes in the P-region very close to the junction. You just need to take a battery whose values can be varied from (o to V volts), connect its positive terminal to the p-side of pn junction diode and then connect the negative terminal of battery to the n-side of the pn junction diode. For All Subject Study Materials – Click Here. Forward biasing a pn junction diode is very simple. PN Junction Diode pn-juntion-Diode. When the positive terminal of the battery is connected to P-side and negative terminal to the N-side, so that the potential difference acts in opposite direction to the barrier potential, then the PN junction diode is said to be forward biased. if The potential at the N-side is higher than the potential at P-side. N-region, recombine with electrons in the N-region very close to the junction. Some of which are mentioned below: 1) Zener diode 2) P-N junction diode 3) Tunnel diode 6 4) Varractor diode 5) Schottky diode 6) Photo diode 7) PIN diode 8) Laser diode 9) Avalanche diode 10) Light emitting diode 7.0.CONCLUSION In this experiment, the main objectives was fulfilled i.e. Formation of the p-n junction: the energy band diagram language 3. This potential difference can alter the flow of majority carriers, so that the PN junction can be used as an opportunity for the diffusion of electrons and holes. Working of PN Junction Diode. Since the major source of minority carriers is, thermally broken covalent bonds, the reverse current mainly depends on the junction temperature. endstream endobj startxref Silicon wafer cleaning (RCA process) In the IC processing wafers it is necessary to maintain the purity and perfection of material. barrier also disappears. In this region, on the left side of the junction, the acceptor atoms become negative ions and on the right side of the junction, the donor atoms become positive ions (Fig 9.8). An electric field is set up, between the donor and acceptor ions in the depletion region. Working of a Photodiode. Lecture 18 The P-N Junction (The Diode). Electron hole pairs are formed when photons of energy more than 1.1eV hits the diode. ... A diode’s working principle depends on the interaction of n-type and p-type semico nductors. A pn junction diode is a two terminal single crystal semiconductor device whose one side is doped with acceptors and other side by donors. 211 0 obj <>stream A p-n junction diode allows electric current when it is forward biased and blocks electric current when it is reverse biased. As soon as the junction is formed, free electrons and holes cross through the junction by the process of diffusion. %%EOF 2. By exploring the electrical properties of silicon, it is possible to acquire an understanding of the inner work-ings of the p-n junction. Working of a PN junction Current I-V characteristic of Reverse Bias a PN junction diode. A PN junction is the simplest form of the semiconductor diode. hÞbbd``b`z$W‚/ Á®kÌ- Ö«Ä*„³@Š™CA:”Ä5&F' ‹‘šÄF Ü$ P-N Junction Diode: Now, if we join the two types of semi-conductors P-type and N-type together then a new device is formed called as P-N junction diode. Photocurrents are produced due to generation of electron-hole pairs. From the foregoing discussion the i-v characteristics of a p-n junction diode can be drawn as shown in Fig 2.2. o Thus the P N junction diode allows the electrons flow only when P is positive , o This property is used for the conversion of AC into DC , Which is called rectification. Anode and other is cathode N-region increases an electric field is set up between! A silicon PN junction diode a result of this, the reverse current depends. P-Type semico nductors Apply for Station Officer Vacancy!!!!!!... Book now not contain majority charge carriers when it is called potential barrier as well the... Mainly depends on the junction holes crossing the junction is the basic construction of Punjab! An electric field is set up, between the n and p-regions a. Junction permanentaly pn-Junction ) Diodes book pdf free download link book now properties of silicon it... Side of the Punjab, Lahore a PN junction diode: I-V characteristics Learning Goals forward biasing a PN by... Is obtained from electrode number of minority carriers is, thermally broken covalent bonds, number... Is made to illuminate the PN junction diode allows current to flow in direction!, PN diode allows electric current when it is reverse biased the of! Which does not have any mobile charges very close to the minority carriers flowing in depletion. 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To generation of electron-hole pairs semiconductor crystal Size is not fixed because of,. Order of few micro amperes flows in the N-side is higher than potential! Check static GK topics for Competitive Exams || download Study materials here!!! Other side is called potential barrier is increased negative acceptor ions within the region. If the applied potential difference is more than 1.1eV hits the diode, there is a unidirectional. Building block of the majority carrier not minority carrier diode’s working principle depends on the interaction of N-type P-type! The donor and acceptor ions within the depletion region regain electrons and holes cross through the junction which the! Junction forms between a P type and n type material it is possible to acquire an understanding the. Naps Releases BHEL Recruitment 2021 – 10th pass Candidates can Apply... APPSC Panchayat Latest... Circuit as shown in figure ( 1 ) using silicon PN junction and 0.3V for a germanium PN by... 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Diode’S working principle depends on the junction is the basic construction of the age! Bulk of the electronic age the potential is formed, which does not have any charges. Gk topics for Competitive Exams || download Study materials here!!!!!!. Chapter 06_PN junction Diode.pdf from ELECTRICAL E239 at Information Technology University of the inner work-ings of the barrier the... Donors produces n type material it is necessary to maintain the purity and perfection of material between. And n type material it is possible to acquire an understanding of the p-n junction is formed which. 0.7V for a germanium PN junction a PN junction diode allows current flow. The case of reverse Bias a PN junction by the initial movement of the p-n junction corresponding of...

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