EPW Forum

Dear all,
To calculate the carrier mobility for small band gap semiconductors with free carriers (1E20), I tried a few scissor-shifts to increase the gap. However, I am always getting the following errors, for example,

Valence band maximum = 7.468149 eV
Conduction band minimum = 8.055196 eV
Warning: too many iterations in bisection
Ef = 0.000000
Mobility VB Fermi level 0.000000 eV
Valence band maximum = 7.468149 eV
Conduction band minimum = 8.055196 eV
Warning: too many iterations in bisection
Ef = 0.000000
Mobility CB Fermi level 0.000000 eV

Any suggestions to avoid this error are greatly appreciated!
Best,
Sai

Hi,

If you know where the Fermi level should be located you can provided in the input file through the flag fermi_energy.

Best,
Roxana