According to band theory, the reason that an insulator does not conduct an electric current well...
According to band theory, the reason that an insulator does not conduct an electric current well is that ______.
A). there is no energy gap between the valence band and the conduction band
B). the energy gap between the valence band and conduction band is large
C), the energy gap between the valence band and conduction band is small
D). there is no conduction band
Homework Answers
Correct option: B
The band gap between the valence band and the conduction band is very large in case of insulators. Therefore, the electrons can not overcome the band gap to reach the conduction band from valence band. Hence, insulators are non-conductive.
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According to band theory, the reason that an insulator does not
conduct an electric current well...
According to band theory, a band is (a) an elastic force that holds electrons close to...
According to band theory, a band is (a) an elastic force that holds electrons close to atoms in a insulator. (b) the energy gap associated with semiconductor.
For the following questions please use more detail than the band theory explanation. 1a) What atomic energy levels combine to form the valence band?? Please specify the specific energy levels; a diagr...
For the following questions please use more detail than the band theory explanation. 1a) What atomic energy levels combine to form the valence band?? Please specify the specific energy levels; a diagram will help! 1b) What atomic energy level combine to form the conduction band?? Please specify the specific energy levels and a diagram!! 1c) If there is a relatively low concentration of an ionic impurity in an insulator how does its electronic structure appear in the band structure of...
Theory section is below for the equations PRELAB Read the theory section below. Calculate the photon...
Theory section is below for the equations
PRELAB Read the theory section below. Calculate the photon wavelength in nm corresponding to a photon energy equal to the theoretical band gap energy of S1.121 eV and GaAs, 1.422 eV. These will be used to set the monochromator. THEORY One of the most important characteristics of a semiconductor is its band gap energy Eg Whereas an electron in an isolated atom has discrete energy levels, an electron in a semiconductor crystal has...
(2) In a semiconductor with an energy gap Eg between the valence and the conduction bands we can take Ef (the Fermi ene...
(2) In a semiconductor with an energy gap Eg between the valence and the conduction bands we can take Ef (the Fermi energy) to be halfway between the bands (see figure below): Conduction band Energy gap Eg Valence band Semiconductor a. Show that for a typical semiconductor or insulator at room temperature the Fermi- Dirac factor is approximately equal to exp(-E 2kBT). (Typical Eg for semi-conductors ranges from about 0.5eV to 6eV at T-293K.) b. In heavily doped n-type silicon,...
PART A: The electrons in solids can be found ____________in only certain discrete sharp energy states...
PART A: The electrons in solids can be found ____________in only certain discrete sharp energy states associated with their orbits.in energy states that overlap so that more than one electron is associated with a given energy level.in the same energy states as if the atoms forming the solid were far enough so that their interactions could be neglected.in closely spaced energy levels that form a continuous distribution of energy within a certain range.PART B: When an electron in the valence...
Please explain part b in details thx! Question 2 At 300 K, the bandgap of GaP is 2.26 eV and the effective density of states at the conduction and valence band edge are 1.8 x 1019 cm23 and 1.9 x 1019...
Please explain part b in details thx!
Question 2 At 300 K, the bandgap of GaP is 2.26 eV and the effective density of states at the conduction and valence band edge are 1.8 x 1019 cm23 and 1.9 x 1019 cm3, respectively. (a) Calculate the intrinsic concentration of GaP at 300K (7 marks) Calculate the GaP effective mass of holes at 300K. (b) (8 marks) (c The GaP sample is now doped with donor concentration of 1021 cm3 with...
Band structure Consider a one-dimensional semiconductor crystal consisting of 11 atoms with nearest- neighbor atoms separated...
Band structure Consider a one-dimensional semiconductor crystal consisting of 11 atoms with nearest- neighbor atoms separated by a 5 . The band structure for electrons in the conduction band is given by Ec(k) = 101(k-0.2n)2-A(k-02n)"] + 2.25 [eV] and the band structure for holes in the valence band is given by where the wavevector k s in units ofA-1. The allowed wavevectors are--< k 즈 al (a) Is this a direct or indirect gap semiconductor? What is the energy gap...
Question 2 2 pts Doping can best be described as: The charge-storing ability of a material,...
Question 2 2 pts Doping can best be described as: The charge-storing ability of a material, defined as the magnitude of charge stored on either plate, divided by the voltage Material that is electrically insulating (non-metallic), and exhibits an electric dipole structure, meaning there is a separation of (+) and (-) electrically-charged entities on a molecular or atomic level Semiconducting materials in which the electrical behavior is based on the electronic structure naturally present within the pure material Intentional alloying...
1.(a)Explain the differences between conduction and valence band with the aid of an energy diagram (b)Mention...
1.(a)Explain the differences between conduction and valence band with the aid of an energy diagram (b)Mention seven differences between charge and current (c)Explain why ammeters are connected in series but not parallel (d)Explain why always a voltmeter is connected in parallel but not in series
3. Many parameters of crystals are dependent on the band gap. a) From the optical absorption...
3. Many parameters of crystals are dependent on the band gap. a) From the optical absorption spectrum of a certain semiconductor, one finds that the longest wavelength of radiation absorbed is 1.40 m. What is the band gap for this semiconductor? Explain how the band gap gives rise to this behavior. b) What band gap would be needed to make blue (450 nm) LEDs? Explain why. c) Most of the sun's radiation has wavelengths shorter than 1000 nm. For a...
According to band theory, a band is (a) an elastic force that holds electrons close to atoms in a insulator. (b) the energy gap associated with semiconductor.
Theory section is below for the equations
PRELAB Read the theory section below. Calculate the photon wavelength in nm corresponding to a photon energy equal to the theoretical band gap energy of S1.121 eV and GaAs, 1.422 eV. These will be used to set the monochromator. THEORY One of the most important characteristics of a semiconductor is its band gap energy Eg Whereas an electron in an isolated atom has discrete energy levels, an electron in a semiconductor crystal has...
(2) In a semiconductor with an energy gap Eg between the valence and the conduction bands we can take Ef (the Fermi energy) to be halfway between the bands (see figure below): Conduction band Energy gap Eg Valence band Semiconductor a. Show that for a typical semiconductor or insulator at room temperature the Fermi- Dirac factor is approximately equal to exp(-E 2kBT). (Typical Eg for semi-conductors ranges from about 0.5eV to 6eV at T-293K.) b. In heavily doped n-type silicon,...
Please explain part b in details thx!
Question 2 At 300 K, the bandgap of GaP is 2.26 eV and the effective density of states at the conduction and valence band edge are 1.8 x 1019 cm23 and 1.9 x 1019 cm3, respectively. (a) Calculate the intrinsic concentration of GaP at 300K (7 marks) Calculate the GaP effective mass of holes at 300K. (b) (8 marks) (c The GaP sample is now doped with donor concentration of 1021 cm3 with...
Band structure Consider a one-dimensional semiconductor crystal consisting of 11 atoms with nearest- neighbor atoms separated by a 5 . The band structure for electrons in the conduction band is given by Ec(k) = 101(k-0.2n)2-A(k-02n)"] + 2.25 [eV] and the band structure for holes in the valence band is given by where the wavevector k s in units ofA-1. The allowed wavevectors are--< k 즈 al (a) Is this a direct or indirect gap semiconductor? What is the energy gap...
Question 2 2 pts Doping can best be described as: The charge-storing ability of a material, defined as the magnitude of charge stored on either plate, divided by the voltage Material that is electrically insulating (non-metallic), and exhibits an electric dipole structure, meaning there is a separation of (+) and (-) electrically-charged entities on a molecular or atomic level Semiconducting materials in which the electrical behavior is based on the electronic structure naturally present within the pure material Intentional alloying...
3. Many parameters of crystals are dependent on the band gap. a) From the optical absorption spectrum of a certain semiconductor, one finds that the longest wavelength of radiation absorbed is 1.40 m. What is the band gap for this semiconductor? Explain how the band gap gives rise to this behavior. b) What band gap would be needed to make blue (450 nm) LEDs? Explain why. c) Most of the sun's radiation has wavelengths shorter than 1000 nm. For a...
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