Solar spectrum outside atmosphere Solar spectrum at sea level Ultraviolet Visible Infrared 1000 1400 1800 Wavelength (nm) 200 600 2200 2600 3000 Increasing flux-

Q: The first LEDs were made from GaAs, which has a bandgap of 1.43 eV. What wavelength of light would…

A: Unit of energy is converted as follows,

Q: 13. Show that the maximum packing ratio in the diamond structure is ë/3/16. [Hint: The structure may…

A: NOTE

Q: Imagine the primitive cubic lattice. Now imagine grabbingopposite corners and stretching it along…

A: Since the edge length of the lattice is equal, but the angles are now not 90°. Hence the lattice…

Q: Which of these molecular fragments would you expect tobe more likely to give rise to electrical…

A: Electrical conductivity depends upon flow of electrons or charge separation.

Q: What is the trend in the size of the bandgap as you move down the column of the group 4A elements?

A: Band-In molecular orbitals of an atom the set of closely discrete energy levels is called as band.…

Q: The unit cell of a compound containing Co and O has a unitcell shown below. The Co atoms are on the…

A: Since both the O atoms are completely inside the unit cell. Hence the contribution of both O to the…

Q: What type of bonding would you expect in Silicon nitride? explain the answer and what kind of…

A:

Q: The electronic structure of a doped semiconductor isshown here. (a) Which band, A or B, is the…

A: Hey, since you are posted a question with multiple sub-parts, we will answer first three sub-parts.…

Q: The maximum wavelength of light that a certain silicon photocell can detect is 1.11 μm. (a) What is…

A: The energy difference between the top valence band and bottom of conduction band in terms of…

Q: Explain the terms : (a) Intrinsic semiconductor (b) Extrinsic semiconductor.

A: Intrinsic semiconductor: Naturally occurring property of pure material, the number of electrons in…

Q: How Band theory differentiate between semiconductors and semi materials?

A:

Q: Indicate whether each statement is true or false:(a) The band gap of a semiconductor decreases as…

A: FALSE, As the particle size decreases, band gap of semiconductor increases.

Q: Explain what happens when a pure semiconductor made up of Silicon is doped with an Indium atom…

A:

Q: The gap between valence and conduction bands in diamond is 5.47 eV. (a) What is the maximum…

A: (a) The relationship between wavelength and energy is given below.

Q: a. What is the equivalent energy (in Joules) of the power required by Porous at the given time? b.…

A: a. We have 1021ZW= 1W ,so 6917.82 ZW = 6.917× 10-18W. Also we have Power ,P= Energy(E)/time (t), So…

Q: Which is not likely to lead to an increase in electrical conductivity?a. Increasing the temperature…

A: The band gap is the energy difference between the conduction band and valence band.

Q: CdS has a band gap of 2.4 eV. If large crystals of CdS are illuminatedwith ultraviolet light, they…

A: a. Hence, the wavelength of light corresponds to the given band gap is 517 nm . This wavelength…

Q: Which wavelength of light (in nm) is emitted if an electronmoves from the conduction band to the…

A: Energy of an electron is determined by using the formula E=hcλ E is energy. h is Planck's constant.…

Q: (a) What molecular features make a polymer flexible? (b) Ifyou cross-link a polymer, is it more…

A: a. The intermolecular attractions between the polymeric chains can be hydrogen bonding, dispersion…

Q: 3.6 Show that the atomic packing factor for HCP is 0.74.

A:

Q: If you want to dope GaAs to make a p-type semiconductorwith an element to replace As, which…

A: A p-type semiconductor is a type of semiconductor. When the trivalent impurity is added to an…

Q: When you shine light of band gap energy or higher on asemiconductor and promote electrons from the…

A: The conductivity of semiconductor is possible due to the transfer of an electron from the valance…

Q: Is interatomic bonding in ceramics always ionic? Or is that false?

A: Ceramics : These are very brittle , corrosion resistant material made from inorganic non metallic…

Q: Define the term, Band-Gap?

A: Electrons are present in the orbits around the nucleus. On coming together of two charges together…

Q: In how many allotropic forms does arsenic exists?

A: Allotropes of an element are forms of the same element with different physical and chemical…

Q: The electronic structure of a doped semiconductor isshown here. (a) Which band, A or B, is the…

A: The bands closest to the fermi level are valence band and conduction band. The electrical…

Q: Does a photon of red light with a frequency of 4.29 * 1014 Hzhave sufficient energy to promote an…

A: The electrons can be promoted to conduction band from the valence band if the band gap energy and…

Q: A sample of Pb ( Fcc structure ) with a lattice parameter of 0.4949 nm contains one vacancy per 500…

A: For FCC structure of Pb : Lattice Parameter = 0.4949 nm Atomic weight of Pb = 207 g mol-1

Q: (d) Doping can be used to increase conductivity of the substances, explain with examples. What are…

A: Doping increases the conductivity as follows.

Q: In the process of doping a semiconductor, certain impuri-ties are added to increase its electrical…

A: In semiconductors, the gap between the valence band (VB), and the conduction band (CB), is small.…

Q: The figure to the right shows sunlight intensity as a function of wavelength. Answer the following…

A: a. With 1000 nm absorber, the energy is given as:   E=hcλE=6.626×10-34 J.s×3×108 m/s1000×10-9…

Q: If you want to dope GaAs to make an n-type semiconductorwith an element to replace Ga, which…

A: Compound semiconductors have an average of four electrons per atom that is total eight valence…

Q: Two solids are shown below. One is a semiconductor andone is an insulator. Which one is which?…

A: Since in insulators, the gap between the conduction band and valence band is very high. Hence there…

Q: Explain how metallic conductors, semiconductors, and insulators are identified and explain their…

A:

Q: Which of the following doped semiconductors will be p-type and which will be n-type (i)Arsenic in…

A: Since you have posted a question with multiple sub-parts, we will solve first three subparts for…

Q: Indicate whether this statement is true or false:If you want a semiconductor that emits blue light,…

A: Conductors are the substance, which can conduct the electricity whereas insulators are the…

Q: Compare the hybridization of Si atoms in Si(s) with thatof C atoms in graphite (see Fig. 21.26). If…

A: Both Si and C atoms has 4 valance electrons in its outer most shell and both of these form covalent…

Q: Q2. Give a list ONLY for the following items: 1. The main bases on which crystallographic systems…

A: We have asked to give only list for the item given and the answer to this question is given in…

Q: The semiconductor CdSe has a band gap of 1.74 eV. Whatwavelength of light would be emitted from an…

A: The semiconductor CdSe has a band gap of 1.74 eV. The wavelength of light that would be emitted from…

Q: An ideal quantum dot for use in TVs does not contain anycadmium due to concerns about disposal. One…

A: The InP has the ZnS type structure, that is fcc, hence no. of ZnS in one unit cell will be 4 (i.e.…

Q: 1. Estimate at what temperature silicon tends to be as electrically conductive as diamond at room…

A:

Q: Introduction of carbon into a metallic lattice generally resultsin a harder, less ductile substance…

A: Introduction of carbon into a metallic lattice generally results in a harder , less ductile…

Q: Explain how doping can increase the conductivity of a semiconductor.

A: Conductivity is due to the mobility of electrons; therefore, conductivity can be increased by…

Q: In-band theory of bonding for solids, what is a bandgap? Howdoes the band gap differ in metals,…

A: Band gap refers to the distance between the valence band and conduction band. It represents the…