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If the temperature is increased in semi-conductors such that the resistance incessantly falls, it is termed as _______

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If the temperature is increased in semi-conductors such that the resistance incessantly falls, it is termed as _______

(a) Avalanche breakdown

(b) Zener breakdown

(c) Thermal runway

(d) Avalanche runway

This question was addressed to me in an international level competition.

My question comes from Temperature Coefficient of Resistance in portion Simple DC Networks of Basic Electrical Engineering

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The correct option is (c) Thermal runway

Best explanation: When the temperature keeps increasing, the resistance keeps falling continuously and hence the current to increase. This causes the heat in the semi-conductor to rise. This causes the temperature to increase further and the resistance to further decrease. This process continues and until there is sufficient heat to destroy the structure of the semi-conductor completely. This is known as a thermal runway.

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