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Why semi conductor conductivity increases as temperature increase?
Wiki User
∙ 11y ago
Temprature increase the resistivity of a metal as electrons has to travel further against the thermal temprature as increase in temprature will increase the diffussion of electrons while in semi conductor this is dependent on the electric field intensity and charge carrier either n type or p type.
Wiki User
∙ 14y ago
Wiki User
∙ 15y agoSemiconductors, by classification, have a forbidden energy band bound by the valence band on the low-energy end and the conduction band on the high-energy side. At a very low temperature, most charge carriers are inactive -- very few free electrons in the conduction band and free holes in the valence band, where these charge carriers can roam free and complete the circuit when an electrical source (a battery) is connected to a bar of the material. As the temperature rises, the probability of finding free electrons in the conduction band and free holes in the valence band increases, resulting in more free charge carriers available, hence lower resistance.
Wiki User
∙ 14y agoHeat excites the electrons in the valence band of a semiconductor and gets them to move to the conduction band, freeing up spots for electricity to flow. In metalic conductors, however, the heat provides no benefit as far as the electron bands go since the conductor already has free spots in it's valence band. The heat still excites the electrons, however it turns into increased friction. When the electrons get in eachothers way it results in a slower rate at which the electricity can flow.
Wiki User
∙ 11y agoHigher temperatures cause electrons to break free from the atoms of the semi-conductor, so they can flow through the semi-conductor, creating a current.
Wiki User
∙ 12y agoyes they do
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Why does dielectric constant decrease with an increase in temperature?
If the temperature increases, the conductivity will increase too which means the dielectric constant is reduced
Can temperature effect the conductivity of material?
Not sure, in my 9th standard (level of Indian standard education),we studied about conductors....."when temperature increases conductivity of a conductor is also increases". but it is not true in all case because of the properties of the conductors. in some case ...'temperature increase the resistance of a conductor increases so conductivity decreases '. for example: in olden days electronic equipments is more efficient when the atmospheric temperature increases or presence of heat .
What is the effect of temperature on resistance of different metals?
with increase temperature in metal, thermal energy causes atoms in metal to vibrate, in this excited state atoms interact with and scatter electrons, thus decreasing the mean free path, and hence the mobility of electrons to decreases and resistivity increase(Resistivity = 1 / Conductivity )so conductivity of metal decrease as increasing in temperature
Why does the thermal conductivity of a gas increase with increasing temperature?
The effect of temperature on viscosity, and how these facts may be interpreted is presented. The principal observed qualitative facts are as follows: (1) All gases at ordinary pressure become more viscous as the temperature is raised. (2) Most liquids become less viscous as the temperature is raised. (3) Highly compressed gases resemble liquids in this respect: they become less viscous as the temperature is raised. (4) For a few liquids (specifically, liquid helium and liquid sulphur) there is a range of temperature over which the viscosity increases as the temperature is raised.
Why does the electrical conductivity of pure metal decrease with temperature while that of semiconductors increases?
The conductivity depends on the passage of charged particles especially electrons. In metals electrons are easily available in conduction band and so its conductivity is high. As we increase the temperature then core of atoms vibrate largely. So with positive charge it could easily minimize the electrons in the conduction band and hence fall in conductivity In case of semiconductor there will be usually forbidden gap between valence band and conduction band. So conduction is poor at ordinary temperature. But as we increase temperature that would allow electrons to reach conduction band as covalent bonds get broken. Hence higher conductivity
How can you increase the conductivity of a semi conductor?
The conductivity of a semi-conductor can be increased by raising the temperature of the semi-conductor .
Why does dielectric constant decrease with an increase in temperature?
If the temperature increases, the conductivity will increase too which means the dielectric constant is reduced
HOW DOES conductance vary with temperature?
yes temperature affects the conductivity of conductor and semi conductors but in case of insulators temp. has no effect. While we talk about conductors as temp. increases conductivity decreases ,the question is why, look if we take an example of copper the conductivity is so high at normal temperature because the molecules in the copper are so close but when we increase temperature the inter molecule distance increases and result is increasing resistance of the copper, and as we know that resistance is inversely proportional to the conductivity. So in the case of conductor, temperature affects the conductivity. Hey may be you are familiarize with the new aspect called superconductivity, the same effect is here while the temperature of a conductor is so low approximately -273degree the conductor becomes superconductor because Resistance become so low (can say approx. 0 but not exact 0). You should know that most metals increase their electrical resistivity by about 0.005 per degree. Good luck Rjames007
Why sodium chlorides electrical conductivity is increases with increase in temperature?
Solid sodium chloride is neutral.
Can temperature effect the conductivity of material?
Not sure, in my 9th standard (level of Indian standard education),we studied about conductors....."when temperature increases conductivity of a conductor is also increases". but it is not true in all case because of the properties of the conductors. in some case ...'temperature increase the resistance of a conductor increases so conductivity decreases '. for example: in olden days electronic equipments is more efficient when the atmospheric temperature increases or presence of heat .
If pressure is constant and current increases the resistance?
I assume you meant pressure to voltage. The resistance of a conductor is directly proportional to the temperature of the conductor. If the temperature of the conductor increases due to increased current, then the resistance tend to increase too.
WHY dilution increase conductivity?
Molar conductivity is what increases dilution. It is the conductivity of an electrolyte solution.
What is the effect of temperature on transistor?
conductivity of semiconductors increases with increase in temperature as breakdown of covalent bonds take place in the semiconductor due to increase in temp but more & more increase in the temp may result in the breakdown or damage of the semiconductor which results in the decrease in conductivity of semiconductor
If a carbon resistor increases in temperature its resistance will?
This depends on the type of conductor. If the conductor has a positive coefficient the resistance will increase. If the conductor has a negative temperature coefficient the resistance will decrease.
Which semiconductor have positive temperature coefficient?
With the increase in temperature if the resistance increases or the current in the circuit decreases then it is said to be have positive temperature coefficient .But in semi-conductors with the increase in temperature the electrons present in the valance band are excited and they would enter the conduction band for conduction . As the no. of charge carriers always increase in a semi-conductor , implies that the current always increases with the increase in temperature so the semi-conductor can never have positive temperature coefficient
Why does resistance increases with increase in temperature?
this becos an increase in temp causes the immobile electrons to collide with the conductin electron thereby incresing resistance since conductivity is reduced
Is silicon a good conductor at energy?
semi conductor. a good semi conductor. It can also be n or p doped to increase it's conductivity
