Direct Vs Indirect Band Gaps

Question 1

In Band Gaps, what does Conductivity generally depend on?

Answer 1

Crystal Orientation

Question 2

In Band Gaps, what does the Electric Field Depend on?

Answer 2

Depends on k - Scattering Momentum/Direction

Question 3

What is an Attribute of a Direct Band Gap, and an Attribute of Indirect Band Gap?

Answer 3

Direct Band Gap - Normal

Indirect Band Gap - Shiny & Special

Question 4

What is a material which has an Indirect band Gap?

Answer 4

Silicon (Si)

Question 5

Generation/___________ at minimum ______ transfers must involve a moment transfer via ________

Answer 5

Generation/Recombination at minimum energy transfers must involve a moment transfer via photons

Question 6

There is an Indirect band Gap if: ___________ and _________ processes need _______

Answer 6

There is an Indirect band Gap if: Generation and Recombination processes need phonons

Question 7

There is a Direct Band Gap if: _________ produces ________

Answer 7

There is a Direct Band Gap if: Recombination produces photons

Question 8

What is the Band Gap responsible for & what does it affect?

Answer 8

The Band Gap is responsible for resistivity in materials, and only the Fermi lvl and Fermi Function changes