Dielectric suppression and its effect on photoabsorption of nanometric semiconductors

Deeper insight is presented into the origin of the dielectric suppression a nd its effect on the photoabsorption of nanometric semiconductors. Consiste ncy between modelling predictions and experimental observations reveals tha t the dielectric suppression originates from the enhancement of the crystal field due to surface bond contraction and the rise of the surface-to-volum e ratio with decreasing particle size. The suppression of the dielectric fu nction will lead to a blue shift in photoabsorption edges, which may find a pplication in microelectronic and photonic devices of nanometre scales.