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Revered members, Conductors have positive temperature coefficient of resistance, that is , their resistance increases with temperature. While for insulators and semi conductors, the resistance decreases with increase in temperature, what we call negative temperature coefficient of resistance...

Thanks for the replies. @Dr Transport: Does the displaced atom lie stationary when it becomes interstitial?

Semiconductors -- role of displaced Silicon or Germanium Revered Members, When we dope a pure Germanium or Silicon with pentavalent impurity or trivalent impurity, the dopant replaces Silicon or Germanium and bonds with neighbouring Si or Ge atom. That is Dopant takes the centre position and...

sir, i don't understand. could u elaborate, please?

its being said, " more the loss of energy, more the strength of the covalent bond" revered members, could u explain why? thanks in advance