Pure Si at 500 K has equal number of electron ( n e ) and hole ( n h ) concentrations of 1.5 × 1 0 16 m − 3 . Doping by indium increases n h to 4.5 × 1 0 22 m − 3 . The doped semiconductor is of

Question

Pure Si at 500 K has equal number of electron ( n e ​ ) and hole ( n h ​ ) concentrations of 1.5 × 1 0 16 m − 3 . Doping by indium increases n h ​ to 4.5 × 1 0 22 m − 3 . The doped semiconductor is ofNEET 2011 (Mains)

TestHub · Accepted Answer

​ n i 2 ​ = n e ​ n h ​ n e ​ = n h ​ ( n i ​ ) 2 ​ n e ​ = ( 4.5 × 1 0 22 ) ( 1.5 × 1 0 16 ) 2 ​ n e ​ = 5 × 1 0 9 m − 3 ​ So, n f 1 ​ ​ ≫ n e ​ semiconductor is p -type.

Physics - Semiconductors Question with Solution | TestHub

Options:

Doubts & Discussion