Metals and semiconductors at high bias

In summary, the conversation discusses the behavior of metals and semiconductors under high voltage bias, specifically examining how conductivity changes as voltage increases. The question also mentions the Bloch Gruneisen relationship as a potential theory to explain current dependence on temperature, but the speaker is looking for further insight on the relationship between current and voltage.
  • #1
elionix
15
0
Hello,

Is there a well known theory on how metals and semiconductors should behave, electrically, while under a high voltage bias? Say, 2-3V? For example, how does the conductivity change as a function of voltage bias as we go from the low bias regime into high bias? Is there a linear dependence or is it described by a power law?

Thank you!
 
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  • #2
Your question is unclear. Are you talking about devices? Which ones? What does it mean to have a "metal under bias"?
 
  • #3
Not devices, just a metal connected by source drain electrodes, for example.

Take a 1um diameter copper wire and sweep the potential from 0V to 3V. Will the current have a linear dependence on voltage? What about a semiconductor?

For example, theory wise, the dependence of current on temperature can be described by the Bloch Gruneisen relationship, but I was hoping for more insight on current dependence on voltage.
 
Last edited:
  • #4
does my question make sense?
 
  • #5
Yes, but I'm not familiar enough with Bloch Gruniesen relations, etc. to answer it. I'm hoping someone else will chime in.
 

1. What is the difference between metals and semiconductors?

Metals are elements that have a high electrical conductivity due to their free electrons. Semiconductors, on the other hand, have a lower electrical conductivity and their conductivity can be modified by adding impurities or applying a bias.

2. What happens to metals and semiconductors at high bias?

At high bias, both metals and semiconductors experience an increase in their electrical conductivity. In metals, the free electrons are accelerated and can move more easily, while in semiconductors, the added bias allows for a higher number of charge carriers to contribute to the conductivity.

3. How does high bias affect the band structure of metals and semiconductors?

In metals, the energy bands are already partially filled with electrons, so applying a high bias does not significantly alter the band structure. In semiconductors, however, high bias can cause the bands to shift and create a larger energy gap between the valence and conduction bands.

4. What applications use high bias for metals and semiconductors?

High bias is commonly used in electronic devices such as transistors and diodes. It can also be used in photovoltaic cells to increase the efficiency of converting light into electricity.

5. Are there any potential drawbacks to using high bias in metals and semiconductors?

One potential drawback is the increase in power consumption and heat generation. High bias can also cause degradation or damage to the material if not controlled properly. Additionally, high bias can introduce unwanted noise or instability in electronic devices.

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