explain the concept of doping in semiconductors
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Consider the statements I and II below given about semiconductors: I. Doping Si with P creates free electrons. II. Doping Si with B creates holes. Which of the following statements is/are correct? A. Only I B. Only II C. Both I and II D. Neither I nor II
from Semiconductors class
2. An n-MOSFET has substrate doping N,-10°cm, oxide thickness ox-50 nm and n+ poly silicon gate. The oxide has fixed charge of 2 x1010/cm2 Cim 1. Calculate the flat band voltage VF Hint: fixed charge adjustsVby OIC 2. Threshold voltage V HINT
Which of the following statements concerning semiconductors is/are CORRECT? 1. The conduction of electricity in p-type semiconductors occurs by the movement of electrons in the conduction band. 2. Doping an intrinsic semiconductor, such as silicon, with a Group 3A element will produce a p-type semiconductor. 3. An n-type semiconductor uses the movement of positive holes in the valence band to conduct electricity.
Problem 3: Semiconductor doping a) Explain why boron (B) is preferred over indium (In) as the dopant species to achieve highly conductive p-type silicon. b) At very high temperatures (e.g. >1000°C), the conductivity of silicon is not significantly affected by moderate doping (Na or No less than 101/cm), i.e. it is an intrinsic semiconductor. Explain why this is the case.
The Conductivity of metals decreases with increasing Temperature. However, The conductivity of semiconductors increases. Explain these two trends.
10. Can Al be used to produce an n-type semiconductor by doping Ge? Explain your reasoning.
10. Can Al be used to produce an n-type semiconductor by doping Ge? Explain your reasoning. 2
Classify the following as n or p doped semiconductors and explain: (a) Ga doped Ge; (b) As doped Si; (c) In0.49As0.51; (d) Zn1+xO, (e) LixNi1-xO.
Explain your mental model of how n-doping of a semi-conductor works. Include any diagrams if useful.
Utilizing band theory, explain how p-type and n-type semiconductors are made, and show how they work in a diode.