3) A GaAs semiconductor is doped n-type No-3x1016 cm ³. Within the band gap of the material are 8x10¹5 cm-³ donor defects located energetically below the Fermi level such that only 75% of those defects are populated with carriers. 3a. Are the minority carriers electrons or holes for this material? 3b. What is the total free carrier concentration of this GaAs material? 3c. Where is the Fermi Level for this material relative to the conduction band?

Delmar's Standard Textbook Of Electricity
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ISBN:9781337900348
Author:Stephen L. Herman
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Chapter1: Atomic Structure
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Problem 6RQ: How many valence electrons are generally contained in materials used for insulators?
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3)
A GaAs semiconductor is doped n-type ND-3x10¹6 cm ³. Within the band gap of
the material are 8x10¹5 cm ³ donor defects located energetically below the Fermi level such
that only 75% of those defects are populated with carriers.
3a. Are the minority carriers electrons or holes for this material?
3b. What is the total free carrier concentration of this GaAs material?
3c. Where is the Fermi Level for this material relative to the conduction band?
3d. Where is the donor defect trap located relative to the conduction band?
3e. What wavelength of light would be needed to excite trapped charge from the above
mentioned defect site to the conduction band?
Transcribed Image Text:3) A GaAs semiconductor is doped n-type ND-3x10¹6 cm ³. Within the band gap of the material are 8x10¹5 cm ³ donor defects located energetically below the Fermi level such that only 75% of those defects are populated with carriers. 3a. Are the minority carriers electrons or holes for this material? 3b. What is the total free carrier concentration of this GaAs material? 3c. Where is the Fermi Level for this material relative to the conduction band? 3d. Where is the donor defect trap located relative to the conduction band? 3e. What wavelength of light would be needed to excite trapped charge from the above mentioned defect site to the conduction band?
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