Name the majority carrier in an n-type and p-type extrinsic semiconductor. Briefly explain the behavior of the carriers during the formation of the P-N junction and their relation to the depletion region appears in the junction.
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- A p-type semiconductor joined to an n-type semiconductor ... Pick those that apply. Will not allow current to flow in either direction. Has electron current flowing from the n-type to the p-type material Makes a diode Allows positive current flow from the p-type to the n-type materialAn addition of trivalent impurity to a semiconductor creates many a. Holes b. Free electrons c. Valence electrons d. Bound electrons A hole in a semiconductor is defined as a. A free electron b. The incomplete part of an electron pair bond C. A free proton d. A free neutron As the doping to a pure semiconductor increase, the bulk resistance of the semiconductor a. Remains the same b. Increases C. Decreases d. None of the abovea) What is n-type semiconductor materials? What are the majority and the minority cariers? b) What is p-type semiconductor materials? What are the majority and the minority cariers? c) What is depletion region of a p-n junction diode? d) Describe in your own words the forward-bias and reverse- bias conditions of a p-n junction diode. e) Draw a Diode Symbol and label the anode and the cathode. Si Ge 2 ka f) Find V, in the circuit shown in +20 V 2 k2 15V Fig. Fuad Al-Mannai EENG261 Page 1
- Correct the mistake for the underlined phrase in each of the following 1. With forward bias to a p-n junction , the width of depletion layer remains the same 2. A p-type semiconductor material is doped with donor impurities . 3. When a pentavalent impurity is added to a pure semiconductor, it becomes an insulator 4. Addition of pentavalent impurity to a semiconductor creates many Bound electrons 5. A two-diode rectifier will not operate without a capacitive filterProblem 1. Define doping. 2. What is the difference between a pentavalent atom and a trivalent atom? 3. What are other names for the pentavalent and trivalent atoms? 4. How is an n-type semiconductor formed? 5. How is a p-type semiconductor formed? 6. What is the majority carrier in an n-type semiconductor? 7. What is the majority carrier in a p-type semiconductor? 8. Describe forward bias of a diode.(1) Describe the behaviour of a p-n junction under forward and reverse biasing in terms of semiconductor behaviour and sketch the V-I Characteristics of a p-n Junction.
- QUESTION 1 Provide an example each for a trivalent and pentavalent element. Describe the doping process of Silicon (Si) to obtain p-type and n-type semiconductor material. a) b) c) Explain forward bias and reverse bias conditions of an ideal p-n junction diode. Sketch the I-V characteristic of Si and Ge diode. Discuss why Si based semiconductor is move favored in production of solid state devices.Which statement(s) is (are) true about a P-N junction: A. P-N junction consists of n-type and p-type semiconductor materials.B. Free electrons in n-type diffuse across junction to p-type.C. A depletion region formation happens due to electrons and holes moving away from each other due to the electric field.Discuss in detail the formation of a conventional current in a semiconductor. Butress your submission with a suitable diagram, also indicate the direction of holes, electron and current.
- 3. A metal contact to a n-type semiconductor can be considered as a p*-n junction with NA > ND. Draw an energy band diagram of the contact showing the Schottky barrier eoz and the depletion width d. Then draw the energy band diagram in forward and reverse biased conditions. Indicate how the +V or -V bias affects the contact potential and the depletion width. Explain how the bias changes the forward current due to the injection of electrons from the semiconductor into the metal, and the reverse current Io from the flow of metal free carriers into the semiconductor. Show that the rectifying behavior is just like that in a p-n junction.None Problem 1. Define doping. 2. What is the difference between a pentavalent atom and a trivalent atom? 3. What are other names for the pentavalent and trivalent atoms? 4. How is an n-type semiconductor formed? 5. How is a p-type semiconductor formed? 6. What is the majority carrier in an n-type semiconductor? 7. What is the majority carrier in a p-type semiconductor? 8. Describe forward bias of a diode.Take a diode formed by the junction of two type n and p semiconductors. In the figure below is the diagram of the energy bands of these semiconductors, (remember the concept of fermi energy, and knowing that for a pure semiconductor it is in the middle). Based on the figures below, answer a) What is the possible current direction in the direction from p to n or from n to p? b) Explain why the current flow occurs only in one direction.