AIPMT MAINS2011Physics-Semiconductors
AIPMT MAINS 2011 Physics Doping MCQ Question
Type: MCQ-conceptual-Medium-Class 12
Pure Si at 500 K has equal number of electron (nₑ) and hole (nₕ) concentrations of 1.5 × 10¹⁶ m⁻³. Doping by indium increases nₕ to 4.5 × 10²² m⁻³. The doped semiconductor is of :
A
n-type with electron concentration nₑ = 2.5 × 10²³ m⁻³
B
p-type having electron concentrations nₑ = 5 × 10⁹ m⁻³
C
n-type with electron concentration nₑ = 2.5 × 10²² m⁻³
D
p-type with electron concentration nₑ = 2.5 × 10¹⁰ m⁻³
Correct Answer
Option B
Detailed Explanation
The increase in hole concentration indicates that the semiconductor is p-type. The electron concentration is much lower than the hole concentration, confirming it as p-type.
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