Why is a transistor caIIed temperature- sensitive device?

Explanation

A transistor has free electrons and holes as charge carriers. When the emitter -base junction is forward biased and the collector-base junction is reverse biased the charge carriers carry current through the transistor in external circuit.When temperature increases the electrons gain sufficent energy to break the covalent bonds and thus produce a large amount of current. If the transistor is continued to operate at this temperature a strong current would flow through it. As a result the transistor would get heated excessively and ultimately break down. Thus the operations of the transistor is restricted by its temperature.