(a)
Interpretation:
Whether nitrogen-doped diamond is n -type or p -type semiconductor should be classified.
Concept introduction:
Semiconductors are devices that have conductivity intermediate between conductors and insulators and their conductivity gets enhances when doped.
Doped semiconductors are used in commercialized electronic devices as diodes, transistors, LEDs, photovoltaic cells. They all differ in their functions which are as follows:
- Diodes convert alternating current to direct current.
- Photovoltaic cells convert sunlight to electricity.
- LEDs act as a light source.
- Transistors amplify an electrical signal in an integrated circuit.
(b)
Interpretation:
The MO diagram comparing the pure diamond with doped diamond should be drawn.
Concept introduction:
Semiconductors are devices that have conductivity intermediate between conductors and insulators and their conductivity gets enhances when doped.
Doped semiconductors are used in commercialized electronic devices as diodes, transistors, LEDs, photovoltaic cells. They all differ in their functions that are as follows:
- Diodes convert alternating current to direct current.
- Photovoltaic cells convert sunlight to electricity.
- LEDs act as a light source.
- Transistors amplify an electrical signal in an integrated circuit.
(c)
Interpretation:
The band gap energy that corresponds to the wavelength
Concept introduction:
Semiconductors are devices that have conductivity intermediate between conductors and insulators and their conductivity gets enhances when doped.
Doped semiconductors are used in commercialized electronic devices as diodes, transistors, LEDs, photovoltaic cells. They all differ in their functions that are as follows:
- Diodes convert alternating current to direct current.
- Photovoltaic cells convert sunlight to electricity.
- LEDs act as a light source.
- Transistors amplify an electrical signal in an integrated circuit.
Want to see the full answer?
Check out a sample textbook solutionChapter 12 Solutions
CHEMISTRY-TEXT
- what is the difference between ferromagnetic and paramagnetic?arrow_forwarda Spinels are solids with the general formula M²+ (M¹³+)₂ 04 (where M²+ and M¹³ are 3+ 3+ metal cations of the same or different metals). The best-known example is common magnetite, Fe3O4 [which you can formulate as (Fe³+)₂04]. (Fe²+) A crystal of a spinel Given its name, it is evident that magnetite is ferromagnetic. How many unpaired electrons are there in iron (II) and in iron(III) ions? Iron(II) ion: unpaired electron(s) Iron(III) ion: unpaired electron(s)arrow_forward(a) Answer parts i), i),ii) and iv) side by side so that the relative scales are obvious, include electron occupancy. (i) Draw the band structure of potassium (ii) Draw the band structure of silicon (iii) Draw the band structure of carbon (iv) Draw the band structure of germanium (b) Based on your diagrams, state the order of electrically conductivity for the four elements at 300 K, from the smallest to the highest - explain your choice. Magnesium has an electron configuration of 1s? 2s? 2p° 3s?. Using band diagrams explain why this element is considered an (c) electrical conductor. (d) improve its ability to conduct electricity. What type of extrinsic semiconductor results and explain how the addition of arsenic increases conductivity (use diagrams if necessary)? A small amount of arsenic is added to a sample of silicon to (i) Gallium phosphide (GaP) has a band gap of 2.26 eV. Calculate the wavelength of light emitted in nm (1 eV = 1.6 x 1019 J). (e) (ii) It is required for a…arrow_forward
- What is the underlying mechanism that causes superconductivity in certain materials? How can we mitigate the environmental impact of the chemical industry? What is the relationship between molecular structure and the optical properties of materialsarrow_forwardSketch the structure of how the silicon atoms in the mineral hedenbergite, FeCaSi2O6, are connected to oxygen atoms.arrow_forwardWhich phosphorus nitride NP ,NP^+or NP^2- would be paramagneticarrow_forward
- Explain basing on bonding the differences in properties of:(a) Diamond and Graphite (b) Sodium and Copper(c) Carbon and Lead, (d) Fluorine and Iodinearrow_forwardPhosphorus (P) is present in a germanium (Ge) sample. Assume that one of its five valence electrons revolves in a Bohr orbit around each P+ ion in the Ge lattice. (a) If the effective mass of the electron is 0.17 me and the dielectric constant of Ge is 16, find the radius of the first Bohr orbit of the electron. (b) Ge has a band gap (Eg) of 0.65 eV. How does the ionization energy of the above electron comparing to Eg and kBT at room temperature?arrow_forwardDiscuss the nature of bonds in NaCl and diamond. What do you mean by directionality of covalent bonds? Why materials with covalent bonds are brittle?arrow_forward
- 3. Calculate the radius of a tantalum atom, given that Ta has a BCC crystal structure, a density of 16.6 g/cm³, and an atomic weight of 180.9 g/mol.arrow_forwardDefine the term a substitutional alloy?arrow_forwardCalculate the free electron per atom of metal A. The electrical conductivity of metal A is 6.0 × 10² (N- m)-¹. The number of free electrons per volume of metal A is 1.25x102⁹ m ³. Assume that the density of the metal is 8.9 g/mL and its molar mass is 63.6.arrow_forward
- Chemistry for Engineering StudentsChemistryISBN:9781337398909Author:Lawrence S. Brown, Tom HolmePublisher:Cengage LearningChemistry: Principles and PracticeChemistryISBN:9780534420123Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward MercerPublisher:Cengage Learning