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## Homework Statement

Find the densities of states 0.08 eV above the conduction band edge and 0.08 eV below the valence band edge for germanium.

Find the volume density of states (i.e. number of states per unit volume) with energies between the conduction band edge and 0.4 eV above the conduction band edge for germanium.

## Homework Equations

8pisqrt2/h^3*m^(3/2)sqrt(E-Ec)

Using this example as a reference http://ecee.colorado.edu/~bart/book/book/chapter2/pdf/ex2_3.pdf

## The Attempt at a Solution

m=6*10^18, in the example they ignored the *10^-18 on their 1.08 value

(((8pisqrt2*(9.10*10^-31*6)^(3/2))/(6.626*10^-34)^3))sqrt(.08*1.6*10^-19)

=1.76*10^47 m^-3J^-1

Why should I times it by *10^-22, like in the example above? What is the purpose of that or is it an error?

In the example above I don't understand how they calculated that or reduced their value so low. I tried it with the same numbers they gave and it didn't work at all.

This value seems way too high. I need to convert it to eV.

Part 2)

Should I use .02 for this example, for my E-Ec value?