Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
Concepts Of Physics MCQ Edition [Volume 2]PhysicsSemiconductors and Semiconductor Devices

In a p - n junction, a hole diffuses from the p -side to the n -side. This indicates that

Options

  1. Aa conduction electron on the p -side jumps to a broken bond to fill it
  2. Ba bond breaks on the p -side and the electron released from the bond jumps to a broken bond on the n -side to
  3. Ca bond breaks on the n -side and the electron released from the bond jumps to a broken bond on the p -side to
  4. Da bond breaks on the n -side and the electron released from the bond jumps to the conduction band

Correct answer

C. a bond breaks on the n -side and the electron released from the bond jumps to a broken bond on the p -side to

Step-by-step solution

A hole in a semiconductor is a vacancy in a covalent bond (valence band). The movement of a hole from one position to another is physically realized by the movement of a valence electron in the opposite direction. When a hole diffuses from the p -side to the n -side, a valence electron from the n -side must move to the p -side to fill the vacancy. This means a covalent bond breaks on the n -side, and the electron released from this bond jumps to fill a broken bond (hole) on the p -side. As a result, the vacancy (ho

Practice Semiconductors and Semiconductor Devices on Quantrex Academy →

More from Semiconductors and Semiconductor Devices

A pure semiconductor has 6 10¹⁹ conduction electrons per cubic metre. Determine the number of holes present in a sample measuring 1 cm 1 cm 1 mm .For silicon, the band gap is 1.1 eV . Determine the ratio of the band gap to kT for silicon at a room temperature of 300 K .For silicon, the band gap is 1.1 eV . At what temperature does the ratio of the band gap to kT become one tenth of its value at 300 K ? (Silicon will not retain its structure at thDetermine the number of states per cubic metre in the 3s band of sodium, given that its density is 1013 kg m ⁻³ . Additionally, find how many of these states are empty.When a semiconducting material is doped with an impurity, new acceptor levels are generated. During a specific thermal collision, a valence electron gains an energy equal to 2kT , The band gap between the valence and conduction bands for indium antimonide is 0.23 eV . Determine the temperature at which kT becomes equal to this band gap.In zinc oxide (ZnO), the band gap between the valence and conduction bands is 3.2 eV . Assume that an electron in the conduction band recombines with a hole in the valence band, reDetermine the maximum wavelength of electromagnetic radiation capable of creating a hole-electron pair in germanium. The band gap of germanium is 0.65 eV . Full Semiconductors and Semiconductor Devices list All Concepts Of Physics MCQ Edition [Volume 2] PYQs