Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronic Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Direct & Indirect band gap Semiconductors

Status
Not open for further replies.

ashishbatra

Newbie level 1
Joined
Nov 4, 2005
Messages
0
Helped
1
Reputation
2
Reaction score
1
Trophy points
1,282
Activity points
1,306
direct & indirect bandgap semiconductors

Plz give me a brief description about Direct & Indirect band gap Semiconductors
or any good link
 

elmolla

Full Member level 2
Joined
Jul 14, 2005
Messages
132
Helped
20
Reputation
40
Reaction score
2
Trophy points
1,298
Activity points
2,728
If we plot the E-k Diagram of any material, we will get the Valency and Conduction band shapes for every k (K is the wave number which is directly proportional to momentum and E is the total Energy).

If we define the energy band gap as the distance between the maximum point of the Valency band(VB) and the minimum point of the Conduction band(CB), we have one of two cases:

1. The max of the VB is directly under the min of the CB: This is called a direct badn gap material.

2. The max of the VB is not directly under the min of the CB: This is called an indirect band gap material.
 

electronics_kumar

Advanced Member level 2
Joined
Nov 29, 2004
Messages
659
Helped
34
Reputation
68
Reaction score
9
Trophy points
1,298
Location
Tamilnadu
Activity points
5,552
single element semiconductor is having direct bandgap whereas compound ( combination of two elements)semiconductor is having indirect band gap....
 

japholix

Newbie level 4
Joined
Jan 10, 2006
Messages
7
Helped
1
Reputation
2
Reaction score
0
Trophy points
1,281
Activity points
1,336
electronics_kumar said:
single element semiconductor is having direct bandgap whereas compound ( combination of two elements)semiconductor is having indirect band gap....
Not really : Si has an indirect bandgap while GaAs has a direct one
 

ashubrads

Newbie level 5
Joined
Jul 9, 2013
Messages
10
Helped
1
Reputation
2
Reaction score
1
Trophy points
3
Location
BIT Mesra, Ranchi
Activity points
66
single element semiconductor is having direct bandgap whereas compound ( combination of two elements)semiconductor is having indirect band gap....
"basically there's no such true link or idea that a single element semiconductor is direct and compound semiconductor is indirect."
For example : Silicon is an indirect band gap semiconductor while GaAs is a direct. So please make the proper corrections.

Also,Please let me know if I'm wrong.. !!
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top