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The energy gap of GaP is 2.26 eV. Show that partial absorption of visible light is occurred when GaP wafer exposed to visible light, and the materials appears reddish. For visible light, the photon energy is in the range of 1.8 -3.1 eV.

The energy gap of GaP is 2.26 eV. Show that partial absorption of visible light is occurred when GaP wafer exposed to visible light, and the materials appears reddish. For visible light, the photon energy is in the range of 1.8 -3.1 eV.

Delmar's Standard Textbook Of Electricity
Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter1: Atomic Structure
Section: Chapter Questions
Problem 6RQ: How many valence electrons are generally contained in materials used for insulators?
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QUESTION 4 The energy gap of GaP is 2.26 eV. Show that partial absorption of visible light is a) occurred when GaP wafer exposed to visible light, and the materials appears reddish. For visible light, the photon energy is in the range of 1.8 – 3.1 eV. In some semiconductor material the bottom of conduction band does not lie at the b) origin (k + 0). For the absorption process, the electrons absorb the photon and phonon simultaneously to make a transition from valence band to conduction band. Given the wavelength of photon is 2- 10°m and for optical phonon the wavelength is 2~10-9m, respectively. Using the calculated values of energy and momentum of phonon and photon, explain the main roles of photon and phonon for the transition proses. (Given phonon velocity, Vph = 3000 ms-', speed of light, c = 3 x 108 ms1 and Plank constant, h= 4.1357 x 10-15 eVs)
Transcribed Image Text:QUESTION 4 The energy gap of GaP is 2.26 eV. Show that partial absorption of visible light is a) occurred when GaP wafer exposed to visible light, and the materials appears reddish. For visible light, the photon energy is in the range of 1.8 – 3.1 eV. In some semiconductor material the bottom of conduction band does not lie at the b) origin (k + 0). For the absorption process, the electrons absorb the photon and phonon simultaneously to make a transition from valence band to conduction band. Given the wavelength of photon is 2- 10°m and for optical phonon the wavelength is 2~10-9m, respectively. Using the calculated values of energy and momentum of phonon and photon, explain the main roles of photon and phonon for the transition proses. (Given phonon velocity, Vph = 3000 ms-', speed of light, c = 3 x 108 ms1 and Plank constant, h= 4.1357 x 10-15 eVs)
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