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MHT-CET : Physics Entrance Exam

MHT - CET : Physics - Semi Conductors Glossary

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                     Conductors: Substances which offer very little resistance to the flow of current through them.

                     Insulators: Substances which offer a very large resistance to the flow of current through them.

                     Semiconductors: Substances which offer a moderate resistance, greater than conductors but less than insulators, to the flow of current through them.

                     Intrinsic Semiconductors: Pure semiconductors such as silicon, germanium, gallium arsenide, etc.

                     Extrinsic Semiconductors: Semiconductors which are doped by a small amount of impurity.

                     p-type Semiconductor: A semiconductor doped by an impurity of 'acceptor' atoms (e.g. Bron) which increase the concentration of holes in the semiconductor.

                     n-type Semiconductor: A semiconductor doped by an impurity of 'donor' atoms (e.g. Phosphorus) which increase the concentration of conduction electrons in the semiconductor.

                     p-n Junction Diode: A device formed by doping half part of a semiconductor with acceptor atoms and the other half with donor atoms.

                     Depletion Region: A region of small width near the junction of a p-n junction diode which is 'depleted' or free of mobile charge carriers.

                     Barrier Potential: The diffusion of majority charge carriers across the junction of a semiconductor diode creates a potential difference across the junction. This potential prevents or forms a barrier to further diffusion of majority charge carriers.

                     Forward Biasing a Diode: When p-type region of the diode is connected to the positive terminal of a battery and n-type region of the diode is connected to the negative terminal of the battery, the diode is said to be forward-biased.

                     Reverse Biasing a Diode: When p-type region of the diode is connected to the negative terminal of a battery and n-type region of the diode is connected to the positive terminal of the battery, the diode is said to be reverse-biased.

                     Knee Voltage: The voltage across a forward-biased diode at which the current just starts to rise sharply.

                     Transistor: A three terminal semiconductor device. The terminals are named emitter, collector and base.

i.

PNP Transistor: A transistor with a n-type base sandwiched between p-type emitter and p-type collector.

ii.

NPN Transistor: A transistor with a p-type base sandwiched between n-type emitter and n-type collector.

                      

                     Amplifier: A device which magnifies a signal.

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