(a)
Interpretation:
The dopants required to make
Concept introduction:
A semiconductor is type of conductor that has conductance in-between good conductors and insulators. There are two types of semiconductors, that is, p-type semiconductor and an n-type semiconductor. The p-type semiconductor has holes to conduct electricity and n-type semiconductor has electrons to conduct electricity.
(b)
Interpretation:
The dopants required to make
Concept introduction:
A semiconductor is type of conductor that has conductance in-between good conductors and insulators. There are two types of semiconductors, that is, p-type semiconductor and an n-type semiconductor. The p-type semiconductor has holes to conduct electricity and n-type semiconductor has electrons to conduct electricity.
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PHYSICAL CHEMISTRY-STUDENT SOLN.MAN.
- a) A hexagonal close-packed layer in two dimensions is shown in figure 2.By identifying a suitable unit cell, calculate the packing fraction of this structure.arrow_forward(a) Why electrical conductivity of the semiconductor increases with increase in temperature? Illustrate and explain the above effect with hypothetical band energy diagrams, showing one at 25 °C and another at 50 °C? (b) The number average molecular weight of polyvinyl chloride (PVC) is 110000 g/mol and the Polydispersity index (PDI) is 1.3. What is the weight average molecular weight and degree of polymerization of PVC? Note: Molar mass of vinyl chloride is 62.498 g/molarrow_forwardWhich of these statements is false?(a) As you go down column 4A in the periodic table, the elementalsolids become more electrically conducting. (b) Asyou go down column 4A in the periodic table, the band gapsof the elemental solids decrease. (c) The valence electroncount for a compound semiconductor averages out to fourper atom. (d) Band gap energies of semiconductors rangefrom ∼0.1 to 3.5 eV. (e) In general, the more polar the bondsare in compound semiconductors, the smaller the band gap.arrow_forward
- A compound of Sn, Cd and P are mixed together to synthesize a semiconductor. The phosphorous atoms reside in the corners and faces of a cube and the Cd and Sn atoms each reside in 1/4 of the tetrahedral holes. Provide the formula for the compound.arrow_forwardAn ideal quantum dot for use in TVs does not contain anycadmium due to concerns about disposal. One potentialmaterial for this purpose is InP, which adopts the zinc blende (ZnS) structure (face-centered cubic). The unit celledge length is 5.869 Å. (a) If the quantum dot is shaped likea cube, how many of each type of atom are there in a cubiccrystal with an edge length of 3.00 nm? 5.00 nm? (b) Ifone of the nanoparticles in part (a) emits blue light and theother emits orange light, which color is emitted by the crystalwith the 3.00-nm edge length? With the 5.00-nm edgelength?arrow_forwardThere are four different types of band structures at 0 K. Among them, two are typified in metals, one in semiconductors and the last one in insulators. Which of the following statement/s is/are false? (i) In this band structure typified in metals, the outermost band is partially filled with electrons; (ii) In this band structure also typified in metals, there is an overlap of an empty band and a filled band; (iii) In the semiconductors, the band gap energy is narrower than insulators; (iv) In insulators, the band gap energy is wider than semiconductors. C. (iii) A. (i) E. None of the above D. (iv) B. (ii) Other:arrow_forward
- (a) A hypothetical compound MB2 crystallises in the rutile lattice structure. (i) Draw the lattice structure of the unit cell MB2. (ii) Show by calculation that the stoichiometry of the formula is consistent with the structure. (iii) Determine the coordination number of the MB₂ unit cell.arrow_forwardIndicate whether each statement is true or false:(a) The band gap of a semiconductor decreases as the particlesize decreases in the 1–10-nm range.(b) The light that is emitted from a semiconductor, uponexternal stimulation, becomes longer in wavelength asthe particle size of the semiconductor decreases.arrow_forwardAn ideal quantum dot for use in TVs does not contain anycadmium due to concerns about disposal. One potentialmaterial for this purpose is InP, which adopts the zincblende (ZnS) structure (face-centered cubic). The unit celledge length is 5.869 Å. (a) If the quantum dot is shaped likea cube, how many of each type of atom are there in a cubiccrystal with an edge length of 3.00 nm? 5.00 nm? (b) Ifone of the nanoparticles in part (a) emits blue light and theother emits orange light, which color is emitted by the crystalwith the 3.00-nm edge length? With the 5.00-nm edgelength?arrow_forward
- Identify 2 elements that would lead to an n-type semiconductor when added in trace amounts to silicon. Explain your response.arrow_forwardWhat is the answerarrow_forwarda) Explain the band structure of an electrical conductor (metal), a semiconductor, and an insulator at 0 K by showing the valence and conduction bands and fermi energy levels. Explain how the electrical conduction takes place in these three types of materials. Give an example for each type of material. b)Explain what n and p-type semiconductors are using their band structures. Why?arrow_forward
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