Effects of oxide-charge space correlation on electron mobility in inversion layers
The effect of the space correlation of oxide charges on the effective mobility of electrons in the channel of an NMOS transistor has been studied. Mobility has been obtained by a single-electron Monte Carlo simulation in which space correlation has been included simultaneously with other effects such as screening of point charges by mobile carriers, image charges, and phonon and surface-roughness scattering. Results have been obtained by assuming different degrees of space correlation for several temperature values and diverse oxide-charge concentrations and positions. The charged-centre space correlation is shown to have a noticeable effect on the electron mobility.