How does the resistance of a semiconductor change with increase of temperature?
Answers
Explanation:
The resistance decreases with an increase in temperature. The resistance is directly proportional to the temperature. ... Thus, as the temperature rises, more covalent bonds break, releasing more electrons which lowers the resistivity rapidly.
Answer:The resistance decreases with an increase in temperature. The resistance is directly proportional to the temperature. ... Thus, as the temperature rises, more covalent bonds break, releasing more electrons which lowers the resistivity rapidly.
Explanation:i) Semiconductor
The resistance decreases with an increase in temperature. The resistance is directly proportional to the temperature.
The number of charge carriers in semiconductors is lesser than that of insulators. Semiconductors like Silicon and Germanium include lesser charges than those of metals but has more charges than insulators.
These carriers are generated by the thermal breaking of bonds. Thus, as the temperature rises, more covalent bonds break, releasing more electrons which lowers the resistivity rapidly.
ii) Alloy
The resistance of an alloy remains nearly unaffected by the change in temperature. In alloys, like constantan, atoms are in disorder so alloys have big resistivity. Their additional disorder due to temperature increase is insignificant.