Concepts Of Physics MCQ Edition [Volume 2]
- Exam
- Concepts Of Physics MCQ Edition [Volume 2]
- Subject
- Physics
- Chapter
- Semiconductors and Semiconductor Devices
Concepts Of Physics MCQ Edition [Volume 2] · Physics · Semiconductors and Semiconductor Devices
In a p - n junction, a hole diffuses from the p -side to the n...
In a - junction, a hole diffuses from the -side to the -side. This indicates that
Options
- Aa conduction electron on the -side jumps to a broken bond to fill it
- Ba bond breaks on the -side and the electron released from the bond jumps to a broken bond on the -side to fill it
- Ca bond breaks on the -side and the electron released from the bond jumps to a broken bond on the -side to fill it
- Da bond breaks on the -side and the electron released from the bond jumps to the conduction band
Correct answer
C. a bond breaks on the -side and the electron released from the bond jumps to a broken bond on the -side to fill it
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 -side to the -side, a valence electron from the -side must move to the -side to fill the vacancy.
This means a covalent bond breaks on the -side, and the electron released from this bond jumps to fill a broken bond (hole) on the -side. As a result, the vacancy (hole) effectively shifts from the -side to the -side.
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 -side to the -side, a valence electron from the -side must move to the -side to fill the vacancy.
This means a covalent bond breaks on the -side, and the electron released from this bond jumps to fill a broken bond (hole) on the -side. As a result, the vacancy (hole) effectively shifts from the -side to the -side.