A the material is p type because the fermi energy

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: p0 2 × 10 (d) Finally, we have ⎛ p0 ⎞ ⎛ 2 × 1016 ⎞ EFi − EF = kBT ln ⎜ ⎟ = 0.0259 ln ⎜ = 0.365 eV ⎝ 1.5 × 1010 ⎟ ⎠ ⎝ n0 ⎠ 4.22 The Fermi energy level in silicon at T = 300 K is as close to the top of the valence band as to the midgap energy. (a) Is the material n type or p type? (b) Calculate the values of n0 and p0. (a) The material is p- type, because the Fermi energy is closer to the valence band than to the conduction band. (b) ⎛E⎞ 1.12 ⎞ ⎛ p0 = N v exp ⎜ − G ⎟ = 1.04 × 1019 exp ⎜ − = 2.1 × 1014 cm −3 ⎝ 4 ⋅ 0.0259 ⎟ ⎠ ⎝ 4 kBT ⎠ . ni2 (1.5 × 1010 )2 6 −3 n0 = = = 1.07 × 10 cm p0 2.1 ×...
View Full Document

Ask a homework question - tutors are online