Determine the width (in eV) of a forbidden energy band & also Determine the width of the forbidden bandgap that exists at ka = ? (see Figure 2.1 & 2.2 ). Assume that the coefficient ?́ = 10 and the potential width is a = 6.5 Å. f (aa)4ka 3 2тka = 0+1-4-3aaka 3 Зпka 3 пka = TFig. 2.1: the entire f (aa) function. The shaded areas show the allowed values of (aa)Corresponding to real values of k. E 4Allowed!energyband !! Forbiddenjenergy band2737aaFig. 2.2: The E versus k diagram generated from Figure 2.1. The allowed energy bandsand forbidden energy band gaps are indicated.

Forbidden energy is the other name for bandgap ist the energy difference between the two-level of…

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Introductory Circuit Analysis (13th Edition)

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ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

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Determine the width (in eV) of a forbidden energy band & also Determine the width of the forbidden bandgap that exists at ka = ? (see Figure 2.1 & 2.2 ). Assume that the coefficient ?́ = 10 and the potential width is a = 6.5 Å.

f (aa)4
ka 3 2т
ka = 0
+1
-4
-3
aa
ka 3 Зп
ka 3 п
ka = T
Fig. 2.1: the entire f (aa) function. The shaded areas show the allowed values of (aa)
Corresponding to real values of k.

E 4
Allowed!
energy
band !
! Forbidden
jenergy band
27
37
a
a
Fig. 2.2: The E versus k diagram generated from Figure 2.1. The allowed energy bands
and forbidden energy band gaps are indicated.

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