Why does resisitivity of a material increase with temperature whereas in case of semiconductors, it decreases ?

Why does resisitivity of a material increase with temperature whereas

1.	Why does resisitivity of a material increase with temperature whereas in case of semiconductors, it decreases ?
Answer» In semiconductors free electrons available for conduction are very LESS, hence when temp increases valence electrons jumps into upper energy layer & BECOMES free electrons, hence conductivity increases , hence resistance decreases. in metals there are already many free electrons, which is called 'ocean' of electrons, but when temp increases atoms i.e. their crystal structures starts vibrating( this phenomenon is difficult to understand bcoz its quantum physics phenomena) which OBSTRUCTS free electrons, hence resistance decreases. but still resistanse increased in metals at any particular temp is far far less than that of decreased resistance in semiconductors. hope this will HELP you... mark it as brainliest answer.....

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Why does resisitivity of a material increase with temperature whereas in case of semiconductors, it decreases ?

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