Understanding the Hall Effect in Semiconductors

[prescott2006]

Homework Statement

There are 4 questions in the assignment. None of them need calculation. The questions is as attached below.

Homework Equations

None.

The Attempt at a Solution

1. I think the "photoconductivity" is a typo, should be replaced with "photoconductor". From Wiki, I found that photoconductor=LDR, so I just explain the fabrication and structure of LDR.
2. I explain the electrons and holes response when voltage and magnetic field are applied as in typical Hall experiment. I not sure whether I achieve the question request or not since it state there "diffusion". What does "What is the significant of RH?" request me to explain?
4. I have no idea with this one, since I cannot found band diagram of quantum dot and well and put them as comparison. Perhaps somebody can help.

 

[berkeman]

Homework Statement

There are 4 questions in the assignment. None of them need calculation. The questions is as attached below.

Homework Equations

None.

The Attempt at a Solution

1. I think the "photoconductivity" is a typo, should be replaced with "photoconductor". From Wiki, I found that photoconductor=LDR, so I just explain the fabrication and structure of LDR.
2. I explain the electrons and holes response when voltage and magnetic field are applied as in typical Hall experiment. I not sure whether I achieve the question request or not since it state there "diffusion". What does "What is the significant of RH?" request me to explain?
4. I have no idea with this one, since I cannot found band diagram of quantum dot and well and put them as comparison. Perhaps somebody can help.

I'm no help on #4, but I think you did the right thing on #1.

On #2, I don't really know what they are asking about in terms of "diffusion" either, but maybe it's a language issue? Is this translated from somewhere? The wikipedia entry does not use that term either:

http://en.wikipedia.org/wiki/Hall_effect

but it does have a good discussion of Rh and how it can be used.