# Homework Help: Electron and hole contributions to the current of a diode

1. Aug 15, 2010

### stagger_lee

Having some trouble with this question. I don't even know where to start to be honest. Any help/pointers greatly appreciated. Thanks!

Been working on this for a while now and have found a possible relevant equation to add. Am I heading in the right direction? I don't even know what each term represents!

1. The problem statement, all variables and given/known data

A symmetric diode operates in forward bias with a total current of 1mA. What are the electron and hole contributions to this current?

(i) In the space-change region
(ii) In the neutral n-region, one diffusion length from the edge of the space-charge region
(iii) In the neutral n-region, ten diffusion lengths from the edge of the space-charge region

2. Relevant equations

Would I use the diffusion constant?

D = $$V{t}$$I

D = diffusion constant????
$$V{t}$$ = ???????
I = current ???????

3. The attempt at a solution

Last edited: Aug 15, 2010