912903.fig.007
Figure 7: Energy-level diagram for an undoped or P-doped Si NC. P is in the configurations with high . Filled (empty) circles indicate that P-induced defect energy levels are occupied (unoccupied) by electrons. Spin-up (spin-down) states of P-induced defect energy levels are indicated by up (down) arrows. (Reprinted from [36] copyright 2011 American Chemical Society).