QuantumATK Forum

QuantumATK => General Questions and Answers => Topic started by: paramjot on August 17, 2020, 20:09

Title: Regarding Mobility
Post by: paramjot on August 17, 2020, 20:09

I have calculated mobility of graphene as described in the example then i do a structural modification by adding an elements. the outcome is its electron mobility decease but its hole mobility is increases. Is this normal?

Title: Re: Regarding Mobility
Post by: Tue Gunst on August 18, 2020, 09:14

Hi,
Please check if the fermi-level is in the electron or hole band?
If you have a positive fermi-level shift, then you will have a large electron carrier density but zero holes and should focus on the electron mobility.
If you have a zero hole carrier density, you can still have a large mobility (the few carriers can move freely). But the current density is very low and it is a minority of the charge transport.
Hope it helps in your analysis.
Best regards,
Tue