Question

A p-type semiconductor has acceptor levels 57 $meV$ above the valence band. The maximum wavelength of light required to create a hole is (Planck's constant h= $6.6\times {10}^{-34}J-s$)

• A. $57\AA$
• B. $57\times {10}^{-3}\AA$
• C. $217100\AA$
• D. $11.61\times {10}^{-33}\AA$

Answer 1

The correct option is C $217100\AA$

$E=\frac{hc}{\lambda }\lambda =\frac{hc}{E}=\frac{6.6\times {10}^{-34}\times 3\times {10}^8}{57\times {10}^{-3}\times 1.6\times {10}^{-19}}=217100\AA$