GaAs is a good material to fabricate LED (Light Emitting Diode) , whereas Si is not. (i) Briefly explain the reason by introducing the concept of band structure. (Hint: E-k diagram)  (ii) In Si, how does a free electron and a hole recombine, and when they do, how does the energy dissipate?

Q: An intrinsic semiconductor with an intrinsic hole concentration of p(i)= 2.45x10^10 cm³, has been…

A:

Q: Elaborate the following with Scientific Reason a. Why Intrinsic Semiconductor materials are the bad…

A: a) Intrinsic Semiconductor materials are the bad conductors of electricity because it is a pure…

Q: Draw the energy band diagram of an ideal p-i-n device structure in the dark! For each side of the…

A: According to question we have to draw the energy band diagram of an ideal p-i-n device structure.

Q: n-type semiconductor sample has an electron density of 6.25x10^18/cm^3 at 300K.If the additive-free…

A: Solution :-  As per mass action law :-  np=n2i where n is the concentration of electron in n type…

Q: Q2: What is the difference between Ideal, Silicon and Germanium diodes in term of forward and…

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Q: We inject electrons into a p-type semiconductor 5 microns long such that the concentration varies…

A: Diffusion current is the movement of holes and electrons from high-concentration locations to…

Q: Give the classification of diodes by design, technology and their application.

A: Shockley DiodeIt was one of the first semiconductor devices that invented. It has has four layers.…

Q: Q3:- A bar of p-type silicon, has a cross-sectional area A =106 cm? and a length L= 1.2x103 cm. For…

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Q: 2. A silicon specimen is doped with 4.73 x1010/cm³ Antimony and 3.57x1010/cm³ Aluminum. a) Calculate…

A: We need to find out electron and hole concentration of given semiconductor .

Q: 5. Consider the energy diagrams for Si, Ge, and GaAs shown below (also in Slide 14 in Lecture 2.3…

A: Calculation of wavelengths for given energy diagrams of Si, Ge and GaAs : Enegy bandgap of Ge,…

Q: a. Sketch the characteristic curve and describe briefly the main characteristics of a semiconductor…

A: Semiconductor diode is a single junction two terminal device which is constructed by joing two…

Q: 1. Determine the average ac resistance for the diode with characteristic curve region between 0.7…

A:

Q: H.W5: If the ratio of mopility of electrons to mopility of holes is 3:1 and the condicutivity of…

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Q: PROBLEM 6 Consider the two-dimensional representation of the semiconductor GaAs shown below: : Ga;…

A: The GaAs semiconductor is made up of Gallium and arsenic. Gallium is an electron-deficient atom as…

Q: In electronic circuits it is not unusual to encounter currents in themicroampere range. Assume a 35…

A: Given:  Current a=  35 μA.

Q: The density of free electrons in an arbitrary semiconductor in a given energy band is obtained by…

A: Semiconductor devices are used nowadays very widely. They use silicon- and germanium-based devices.…

Q: In terms of electronics, what purpose does light emitting diodes serve? and what are its application…

A: In terms electronics,purpose of LED is to convert Electrical energy into light energy. Input for LED…

Q: Assume that the conductivity of a pure semiconductor at an applied electric field of 450 mV/m is…

A: The data given in the question are: E=450mV/m, σ=2.75×1013/Ω-cm, vd(e)=0.135m/s, vd(holes)=0.048m/s…

Q: Q1: Estimate the ratio of the electron densities in the conduction bands of silicon (E, = 1.14 eV)…

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Q: Based on the charge neutrality equations, a) Obtain a mathematical expression for the density of…

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Q: In a P-type semiconductor, the Fermi level is 0.3 ev above the valance band at a room temperature of…

A: Fermi level in P-Type semiconductor lies near to valence band. Fermi level EF in P-Type…

Q: i) With suitable crystal structure, explain P type extrinsic semiconductor in detail. i) Draw the…

A: Extrinsic semiconductors are just intrinsic semiconductors that have been doped with impurity atoms…

Q: 1- Why do we need to know that Moor's law is important for semiconductors fabrication? 2- Density of…

A: 1) Moore's law states that number of Transistors on chip gets double in every 18 months

Q: 1)Define Drift and Diffusion current in Semiconductor.

A: Only first individual questions are to be answered, so kindly repost the remaining question. 1.…

Q: 1 (a) Why Ge material has a lower Vbi than Si at T = 300 K and GaAs has a higher Vbi than Si at T =…

A: Built in voltage given by vbi = (kT/q) loge(NaNd/ni2) Here ni is intrinsic concentration  T is…

Q: Find the position of the Fermi energy level relative to the intrinsic level of the Si semiconductor…

A: We need to find out position of Fermi level relative to intrinsic Fermi level .

Q: A silicon material is doped 2.25 x 10 ^ 15 atoms / cm ^ 3 with an element from the group 5a. At T =…

A:

Q: Calculate the effective state densities Uc and Uv for the semiconductors InAs and InSb and their…

A: For InAs: Basic Parameter Eg=0.354ev (1): Effective state density in Uc Nc=22πme*kTh232 (2):…

Q: 1- Why is the photonic devices are considered direct semiconductors? Explain 2- Where does the…

A: NOTE- As per the rules we can answer only 3 sub-parts, please post the remaining sub-parts as the…

Q: a. There are three major steps which are used to explain the flow of carriers through a PN junction…

A: a) In PN diode carrier flows explains by three major steps. 1. Drift 2. Recombination 3. Diffusion…

Q: 4.32: For the Boltzmann approximation to be valid for a semiconductor, the Fermi level must be at…

A: GIVEN: fermi level must be at least 3kT below the donor level in n-type material              fermi…

Q: Based on the charge neutrality equations, a) Obtain a mathematical expression for the density of…

A:

Q: 5) Germanium doped with 1024 m³ Al atoms is a semi-conductor at room temperature and each Al atom…

A: a) aluminium is a trivalent impurities.so when Ge  doped with aluminium makes the semiconductor is a…

Q: Q3:- A bar of p-type silicon, has a cross-sectional area A =106 cm2 and a length L= 1.2x103 cm. For…

A:

Q: Compare the temperature dependence of the conductivity for metals and intrinsic semiconductors.…

A: The intrinsic semiconductor have negative resistance temperature coefficient means its resistivity…

Q: An ideal photo-diode of unit quantum efficiency, at room temperature, is illuminated with 8 mW of…

A: The total current is given by the standard diode equation,

Q: 7. Describe the construction and the material composition of a light emitting diode? An illustration…

A: Given & to find: Describe the construction and the material composition of a light-emitting…

Q: Given a semiconductor band structure E-k diagram as below. For point A, B, and C: (a) compare the…

A:

Q: What is effective mass? Derive an expression for the effective mass in semiconductors. On an E-k…

A: Here I have solved it.

Q: Describe the Float-zone crystal growth proces.. Draw the configuration

A: Float zone (FZ) crystal growth is based on the movement of a liquid zone through the material. A…

Q: QUESTION:3 A special semiconductor material is to be "designed". The semiconductor is to be n- type…

A: Given Na=0Nc=Nv=1.5×1019 cm-3T=400k

Q: Consider germanium Ge and GaAs material. Which material has lower intrinsic carrier concentration ni…

A:

Types of Charge Carriers

A carrier is a type of object which carries a particular thing from one point to another point. For instance, people use different vehicles from one place to another, and the vehicle carries those people and acts as a carrier.