Silicon is diffused at 1100°C for 20 minutes with bismuth (Bi). You measure a diffusion length of 1 µm and the total amount of Bi in the sample is 2 × 10'5 Bi atoms/cm². Use linear approximation and D (a) What is the diffusion coefficient? (b) What is the surface concentration? (c) What is the flux after 10 min? You heat another sample to 1200°C for 20 minutes and the surface concen- tration remains unchanged but the diffusion length increases a factor of 4: (d) What is the total amount of Bi in the sample? (e) What is the value of the activation energy EA? Do exp (– Ea/kT). %3D
Silicon is diffused at 1100°C for 20 minutes with bismuth (Bi). You measure a diffusion length of 1 µm and the total amount of Bi in the sample is 2 × 10'5 Bi atoms/cm². Use linear approximation and D (a) What is the diffusion coefficient? (b) What is the surface concentration? (c) What is the flux after 10 min? You heat another sample to 1200°C for 20 minutes and the surface concen- tration remains unchanged but the diffusion length increases a factor of 4: (d) What is the total amount of Bi in the sample? (e) What is the value of the activation energy EA? Do exp (– Ea/kT). %3D
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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please solve part d and e
Transcribed Image Text:7.2. Silicon is diffused at 1100°C for 20 minutes with bismuth (Bi). You measure
a diffusion length of 1 µm and the total amount of Bi in the sample is 2 ×
1015 Bi atoms/cm². Use linear approximation and D
(a) What is the diffusion coefficient?
(b) What is the surface concentration?
(c) What is the flux after 10 min?
You heat another sample to 1200°C for 20 minutes and the surface concen-
tration remains unchanged but the diffusion length increases a factor of 4:
(d) What is the total amount of Bi in the sample?
(e) What is the value of the activation energy EA?
Do exp (– Ex/kT).
%3D
(a) 5 × 104 cm-2
(b) 1.8 х 10' sec.
(c) 1.12 × 10" atoms/cm² sec
(a) ' 2.1 × 10-12 cm²/sec
(b) 4 х 109 cmi
(c) 1.2 x 1012 atoms/cm² sec
(d) 8 × 103 cm-2
(e) 1.15 eV
7.1.
7.2.
-3
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