Significant enhancement of hole mobility in [110] silicon nanowires   compared to electrons and bulk silicon
  Utilizing sp3d5s* tight-binding band structure and wave functions for electrons and holes we show that acoustic phonon limited hole mobility in [110] grown silicon nanowires (SiNWs) is greater than electron mobility. The room temperature acoustically limited hole mobility for the SiNWs considered can be as high as 2500 cm2/Vs, which is nearly three times larger than the bulk acoustically limited silicon hole mobility. It is also shown that the electron and hole mobility for [110] grown SiNWs exceed that of similar diameter [100] SiNWs, with nearly two orders of magnitude difference for hole mobility. Since small diameter SiNWs have been seen to grow primarily along [110] direction, results strongly suggest that these SiNWs may be useful in future electronics. Our results are also relevant to recent experiments measuring SiNW mobility. 
A. K. Buin, A. Verma, A. Svizhenko, M. P Anantram