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GATE Electronics and Communications (EC) 2018 Solved Paper
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Question : 40
Total: 65
Red (R), Green (G) and Blue (B) Light Emitting Diodes (LEDs) were fabricated using p-n junctions of three different inorganic semiconductors having different band-gaps. The built-in voltages of red, green and blue diodes are V
R
, V
G
and V
B
, respectively. Assume donor and acceptor doping to be the same (N
A
and N
D
, respectively) in the p and n sides of all the three diodes.
Which one of the following relationships about the built-in voltages is TRUE?
V
R
> V
G
> V
B
V
R
< V
G
< V
B
V
R
= V
G
= V
B
V
R
> V
G
< V
B
Validate
Solution:
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