Chemistry

posted by .

What is the minimum wavelength of light that can promote an electron from the valence band to the conduction band in silicon?

  • Chemistry -

    Here is a site that lists the energy gap between the valence band and the conduction band.

    http://www-inst.eecs.berkeley.edu/~ee130/fa07/lectures/Semiconductor_fundamentals_lec1.pdf

    For Si that is 1.12 eV. convert that to wavelength.
    1 eV = 1.6 x 10^-19 joules and
    E = hc/lambda
    Plug in 1 eV (in joules) for E, h is Planck's constant, c is the speed of light at 3.0 x 10^8 m/s, and lambda is what you calculate. Post your work if you get stuck.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. physics

    (1) If an electromagnetic wave has a period of 4.8 μs, what is the frequency and wavelength?
  2. physics....

    1) Yellow light is incident on a single-slit 0.0315 mm wide. On a screen 70.0 cm away, a dark band appears 13.0 mm from the centre of the bright central band. Calculate the wavelength of the light.
  3. Chemistry

    1)The conduction band is at a higher energy than the valence band. True or false?
  4. chemistry

    The band gap of indium gallium arsenide varies based on the concentration of gallium in the material. A sample of InGaAs absorbs light with a wavelength less than 1.37 microns. What is the band gap of the InGaA sample in eV
  5. chemistry

    The band gap of indium gallium arsenide varies based on the concentration of gallium in the material. A sample of InGaAs absorbs light with a wavelength less than 1.37 microns. What is the band gap of the InGaA sample in eV
  6. chemistry

    The band gap of indium gallium arsenide varies based on the concentration of gallium in the material. A sample of InGaAs absorbs light with a wavelength less than 1.37 microns. What is the band gap of the InGaAs sample in eV
  7. chemistry

    An electron falls from the conduction band of silicon (Si) to the valence band. The band gap of Si is 1.1 eV. What is the wavelength of the photon emitted by this process?
  8. chemistry

    Determine if light with wavelength 3.00 x 10-7 m incident on gallium nitride (GaN) can generate electrons in the conduction band. Gallium nitride has a band gap of is 3.2 eV. Photons with wavelengths below what value will generate …
  9. Chemistry (please Help!!)

    determine which experiences a lower effective nuclear charge. using words and/ or drawings explain why. A) an electron in a 2s or an electron in a 2p B) a valence electron on sulfure or a vance electron on silicon C) a valence electron …
  10. Physics(semiconductors)

    Is electron and hole flow the same in a diode?

More Similar Questions