![[590] The band stru energy. What is the minimal photon energy to directly excite an electron from the valence band to the conduction band? A. 0.7 eV B. 0.8 eV C. 1.2 eV D. 1.5 eV cture for an imaginary semiconductor is shown in Figure 2, where Er is the Fermi CJ 1.2 eV Ef 0.8ev 1.5 ev Figure 2](http://img.homeworklib.com/questions/7313a880-4ae9-11ea-91fc-01ea080e9b93.png?x-oss-process=image/resize,w_560)
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[590] The band stru energy. What is the minimal photon energy to directly excite an electron...
4. A photon of light can excite an electron from the valence band to the conduction...
4. A photon of light can excite an electron from the valence band to the conduction band of a semiconductor. This process is called photoconduction. a. PbS has a band gap of 0.37 eV. What wavelength of light would be needed to start the photoconduction in this semiconductor? b. In the light meters of cameras one would need a semiconductor that operates efficiently in visible light, or at-550 nm. Would PbS be a suitable semiconductor for a light meter? Why...
4. A photon of light can excite an electron from the valence band to the conduction...
4. A photon of light can excite an electron from the valence band to the conduction band of a semiconductor. This process is called photoconduction. a. PbS has a band gap of 0.37 eV. What wavelength of light would be needed to start the photoconduction in this semiconductor? b. In the light meters of cameras one would need a semiconductor that operates efficiently in visible light, or at-550 nm. Would PbS be a suitable semiconductor for a light meter? Why...
(A) Comment on the energy needed to excite an electron from the valence band edge to...
(A) Comment on the energy needed to excite an electron from the valence band edge to conduction band edge of InP if the temperature is reduced from 300K to 77K. Justify your answer (B) If the semiconductor is undoped, how does the probability of occupancy of a state at the conduction band edge change as the temperature of the semiconductor is increased? Justify your answer.
(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,...
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...
Draw the energy band diagram at equilibrium for the p+ /n/p semiconductor heterostructure (p+ indicates a...
Draw the energy band diagram at equilibrium for the p+ /n/p semiconductor heterostructure (p+ indicates a p-type semiconductor which is heavily doped, i.e., more heavily doped than p). You should indicate Ec (conduction band), Ev (valence band), Ei (intrinsic Fermi level), and Ef (Fermi level) throughout the device structure. show your work (i.e., you should start from the diagram of individual material pieces). State any reason for your drawing.
The energy gap for a semiconductor is 1.25 eV. Of the frequencies given below, what is...
The energy gap for a semiconductor is 1.25 eV. Of the frequencies given below, what is the minimum frequency photon than can move an electron from the valence band to the conduction band?
Conduction band Energy gap, Valence band The energy gap between the valence band and the conduction...
Conduction band Energy gap, Valence band The energy gap between the valence band and the conduction band in the widely-used semiconductor gallium arsenide (GaAs) is A - 1.424 eV. Suppose that we consider a small piece of GaAs with 1020 available electrons, and use the equilibrium condition derived in the prelecture. 1) On average, how many electrons will be in the conduction band if T-282.15 K? electrons Submit 2) How many holes (the white dots in the figure) will be...
Please help me 1. In degenerate p-type silicon, a. The Fermi energy is above the valence...
Please help me
1. In degenerate p-type silicon, a. The Fermi energy is above the valence energy and below the intrinsic Fermi energy b. The Fermi energy is below the valence energy c. The Fermi energy is above the conduction energy d. The Fermi energy is below the conduction energy and above the intrinsic Fermi energy 2. A semiconductor has No 5X 1010 cm3 and N-2X 1018 cm2. It is a. b. C. d. N-type and electrons are the majority...
Consider a deuterium atom (1 electron orbiting one proton and one proton). Calculate the energy required...
Consider a deuterium atom (1 electron orbiting one proton and one proton). Calculate the energy required to excite an electron in the H atom from the first (n = 2) excited state to the third (n = 4) excited state Calculate the wavelength of the corresponding photon required to create this excitation. Is it in the visible, ultraviolet, or infrared portion of the electromagnetic spectrum? Imagine a large single-crystal wafer of silicon (Si), where a Si atom is replaced by...
4. A photon of light can excite an electron from the valence band to the conduction band of a semiconductor. This process is called photoconduction. a. PbS has a band gap of 0.37 eV. What wavelength of light would be needed to start the photoconduction in this semiconductor? b. In the light meters of cameras one would need a semiconductor that operates efficiently in visible light, or at-550 nm. Would PbS be a suitable semiconductor for a light meter? Why...
4. A photon of light can excite an electron from the valence band to the conduction band of a semiconductor. This process is called photoconduction. a. PbS has a band gap of 0.37 eV. What wavelength of light would be needed to start the photoconduction in this semiconductor? b. In the light meters of cameras one would need a semiconductor that operates efficiently in visible light, or at-550 nm. Would PbS be a suitable semiconductor for a light meter? Why...
(A) Comment on the energy needed to excite an electron from the valence band edge to conduction band edge of InP if the temperature is reduced from 300K to 77K. Justify your answer (B) If the semiconductor is undoped, how does the probability of occupancy of a state at the conduction band edge change as the temperature of the semiconductor is increased? Justify your answer.
(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,...
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...
Conduction band Energy gap, Valence band The energy gap between the valence band and the conduction band in the widely-used semiconductor gallium arsenide (GaAs) is A - 1.424 eV. Suppose that we consider a small piece of GaAs with 1020 available electrons, and use the equilibrium condition derived in the prelecture. 1) On average, how many electrons will be in the conduction band if T-282.15 K? electrons Submit 2) How many holes (the white dots in the figure) will be...
Please help me
1. In degenerate p-type silicon, a. The Fermi energy is above the valence energy and below the intrinsic Fermi energy b. The Fermi energy is below the valence energy c. The Fermi energy is above the conduction energy d. The Fermi energy is below the conduction energy and above the intrinsic Fermi energy 2. A semiconductor has No 5X 1010 cm3 and N-2X 1018 cm2. It is a. b. C. d. N-type and electrons are the majority...
Consider a deuterium atom (1 electron orbiting one proton and one proton). Calculate the energy required to excite an electron in the H atom from the first (n = 2) excited state to the third (n = 4) excited state Calculate the wavelength of the corresponding photon required to create this excitation. Is it in the visible, ultraviolet, or infrared portion of the electromagnetic spectrum? Imagine a large single-crystal wafer of silicon (Si), where a Si atom is replaced by...
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