2006-10-14 05:52:48 · 5 answers · asked by Anonymous in Education & Reference ➔ Homework Help
the increase in temperature gives energy to electrons in the valence band to move into conduction band thereby making more charge carriers available.
2006-10-14 05:55:00 · answer #1 · answered by Anonymous · 1⤊ 0⤋
The difference between conduction in semiconductors and conduction in conductors is evident in the effect of temperature on resistance. You may have learned in a physics class that resistance increases (and conductivity decreases) as a resistor gets hot. Heating any device results in more atomic vibrations. If the atomic cores are vibrating more, electrons will have decreased mobility. Voila - increased resistance. This is the end of the story for conductors, but the resistance of semiconductors depends upon temperature in an additional manner. Increasing the temperature of intrinsic semiconductors provides more thermal energy for electrons to absorb, and thus will increase the number of conduction electrons. Voila - decreased resistance. This second effect in semiconductors is much greater than the effect of atomic vibrations, so increasing the temperature of a semiconductor ends up decreasing its resistance.
2016-05-22 01:35:25 · answer #2 · answered by Cheryl 4 · 0⤊ 0⤋
Hey buddy,
Semi conductors possess this exceptional property...
which is due to the intermediate energy gap...
Here, when you supply heat.. the electrons start exciting and become free to conduct electricity...
Simple... :-)
Generally, in conductors, The resistance RISES as the temp goes up...
Mind iot and be clear...
Never trip on that..
Best of luck
2006-10-14 06:03:59 · answer #3 · answered by Anurag 2 · 1⤊ 0⤋
when u supply heat, the conducting electrons move more... thereby the resistance to flow is lesser.. no obstructions to flow..
2006-10-14 06:04:06 · answer #4 · answered by Meooww 2 · 0⤊ 0⤋
thats the property. Resistance always goes down when heat goes up.
2006-10-14 05:55:24 · answer #5 · answered by larryyinger 3 · 0⤊ 1⤋