Unraveling the Temperature-Hall Voltage Relationship

[leroyjenkens]

I don't understand why as temperature increases, the hall voltage goes down. What's going on with the electrons at increasing temperature to cause that to happen? And why at a certain temperature, the hall voltage starts to go back up? It's hard to find an answer on Google that gives me a conceptual answer to this. Thanks.

 

[Simon Bridge]

It's hard to find an answer on Google that gives me a conceptual answer to this. Thanks.

Conceptual answers? Well... I'll try...

I don't understand why as temperature increases, the hall voltage goes down. What's going on with the electrons at increasing temperature to cause that to happen?

As the temperature increases, resistance also increases.

More complicated - think of the charge carriers in the semiconductor like a gas - the applies magnetic field simplistically put acts like gravity o the gas pushing it down to one side. How much it presses to that side determines the hall voltage. Increased temperature makes the gas lighter and it lifts up so it does not press down so much.

Help?

And why at a certain temperature, the hall voltage starts to go back up?

Having trouble finding an example that is not a mistake.

See:
http://www.pas.rochester.edu/~advlab/2nd_meeting/07_Hall.pdf
And also:
http://www.ifsc.usp.br/~lavfis/BancoApostilasImagens/ApEfHall-CondEletr/EfHall-nGe-5_3_02.pdf

 

[leroyjenkens]

Thanks a lot, that does help.