def get_carrier_concentration(self):
        """
        gives the carrier concentration (in cm^-3)

        Returns
            a dictionary {temp:[]} with an array of carrier concentration
            (in cm^-3) at each temperature
            The array relates to each step of electron chemical potential
        """

        return {temp: [1e24 * i / self.vol for i in self._carrier_conc[temp]]
                for temp in self._carrier_conc}
def get_carrier_concentration ( self ) : return { temp : [ 1e24 * i / self . vol for i in self . _carrier_conc [ temp ] ] for temp in self . _carrier_conc }
gives the carrier concentration (in cm^-3)

        Returns
            a dictionary {temp:[]} with an array of carrier concentration
            (in cm^-3) at each temperature
            The array relates to each step of electron chemical potential