Effects of adjacent metals with different work functions

In summary, the conversation discusses the possibility of a diode effect occurring when two metals with different work functions are in close contact, even without being doped. The thermocouple is mentioned as a useful device that utilizes this phenomenon and the photoelectric effect is also brought up as a work function phenomena. It is suggested to check Wikipedia for more information on work function and conduction band. However, it is noted that any diode effect based on work functions of metals is likely to be minimal due to the high conductivity of most metals. It is also mentioned that semiconductor diodes use doping to create a p-n junction, which allows for the flow of electrons in one direction more than the other.
  • #1
FillBill
7
0
Hi, someone was telling me that if you have two metals in close contact (like, one sputtered onto the other or something) with each other, if they have different work functions, you'll get some sort of diode effect (even without either of them being doped) if you have a current running from one to the other.

Does anyone have any information on this I could read about?

Thank you!
 
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  • #2
A useful device which uses this is the thermocouple. They are used for temperature measurement.
 
  • #3
Check WORK FUNCTION and CONDUCTION BAND
in Wikipedia for some background.

The photoelectric effect is also a work function phenomena...where absorption of a photon
releases a conduction electron.

I suspect any 'diode effect' depending on work functions of metals is miniscule...most metals tend to be pretty good conductors...SEMIconductor diodes use a p doping together with an n doping to create a p-n junction...which passes electrons in one direction far more than the opposite direction.
 

Related to Effects of adjacent metals with different work functions

1. What is the definition of work function in relation to adjacent metals?

The work function is the minimum amount of energy required to remove an electron from the surface of a metal. It is a property that is unique to each metal and is related to its electronic structure.

2. How do adjacent metals with different work functions affect each other?

When two metals with different work functions are placed in contact, there is a flow of electrons from the metal with the lower work function to the metal with the higher work function. This results in a potential difference between the two metals and can lead to various effects.

3. What are some common effects of adjacent metals with different work functions?

Some common effects include the formation of a Schottky barrier, which can affect the electrical conductivity of the metals, and the development of a built-in electric field at the interface between the two metals. This can also lead to changes in the surface work function of the metals.

4. How do the properties of adjacent metals with different work functions affect the performance of electronic devices?

The presence of adjacent metals with different work functions can impact the efficiency and functionality of electronic devices. For example, the formation of a Schottky barrier can hinder the flow of electrons and decrease the device's conductivity. The built-in electric field can also affect the behavior of charge carriers within the device.

5. Can the effects of adjacent metals with different work functions be controlled or manipulated?

Yes, the effects of adjacent metals with different work functions can be controlled and manipulated through various means such as altering the surface properties of the metals or introducing a thin intermediate layer between them. These techniques can help optimize the performance of electronic devices and minimize the negative effects of adjacent metals with different work functions.

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