semiconductors have the property of a decrese in their resistance levels when they are subjected to high temparatures. so i think we can use this property and we can attain superconduction in semiconductors by increasing the temparatures. because, superconductivity using low temparature is a very expensive method and it cannot be implemented for general purposes.
2006-07-28 20:24:49 · 3 answers · asked by harsha varma 2 in Science & Mathematics ➔ Physics
Increasing the temperature of a semiconductor merely promotes more electrons to the conduction band. At the same time the density of phonons is increased. Phonons scatter electrons and cause resistance. Superconductivity requires an infinite mean free path, which cannot be achieved in the presence of phonon scattering.
2006-07-28 20:46:27 · answer #1 · answered by d/dx+d/dy+d/dz 6 · 0⤊ 0⤋
This is true up to a point, but the resistance does not go to zero, only to a certain point. The problem with heating semiconductors to lower their resistance enough is twofold: 1) the energy required to heat them is just as expensive as the energy you're trying to save through superconductivity, and 2) at some point, the semiconductors will still melt, well before the resistance goes anywhere close to zero. Nice try, but there are limits to this line of thinking.
2006-07-29 03:30:54 · answer #2 · answered by theyuks 4 · 0⤊ 0⤋
Because superconductivity and semi-conductors that decrease resistance with temperature work under completely different mechanisms. Semi-conductors experience an abrupt resistance drop through a small range of temperature increase, but if you keep increasing the temperature the resistance will rise again as other mechanisms take over.
2006-07-29 03:33:15 · answer #3 · answered by Steve W 3 · 0⤊ 0⤋