# Quantum Well Electron Energy

## Homework Statement

For a GaAs with bandgap Eg =1.4eV

Effective electron mass is 0.07*me

d=10nm

Calculate the energy of the ground (lowest) electron level in the conduction band with respect to the bottom of the conduction band.

## Homework Equations

Ea =Ec + h^2a^2 / 8*me*d^2

## The Attempt at a Solution

As it was with respect to the conduction band bottom I only used the second part of the equation and as it was the lowest level I had a=1

My result

Put it through Wolfram so you can see working

http://i.imgur.com/xRbGy5f.png

However the answer I was given as a solution was

4.36*10^-21 J ( 0.027eV)in the book

where as my result is 8.6*10^-21

Is there something wrong with my method?

Thanks

Last edited:

## Answers and Replies

Related Advanced Physics Homework Help News on Phys.org
Thanks for the post! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?