Dielectric suppression and its effect on photoabsorption of nanometric semiconductors

Deeper insight is presented into the origin of the dielectric suppression and its effect on the photoabsorption of nanometric semiconductors. Consistency between modelling predictions and experimental observations reveals that the dielectric suppression originates from the enhancement of the crystal field due to surface bond contraction and the rise of the surface-to-volume ratio with decreasing particle size. The suppression of the dielectric function will lead to a blue shift in photoabsorption edges, which may find application in microelectronic and photonic devices of nanometre scales.

[1]  Tsutomu Shimizu-Iwayama,et al.  Mechanism of photoluminescence of Si nanocrystals in SiO2 fabricated by ion implantation: the role of interactions of nanocrystals and oxygen , 1999 .

[2]  John P. Walter,et al.  Wave-Vector-Dependent Dielectric Function for Si, Ge, GaAs, and ZnSe , 1970 .

[3]  Wang,et al.  Dielectric constants of silicon quantum dots. , 1994, Physical review letters.

[4]  Linus Pauling,et al.  Atomic Radii and Interatomic Distances in Metals , 1947 .

[5]  C. Bai,et al.  A MODEL OF BONDING BETWEEN OXYGEN AND METAL SURFACES , 1997 .

[6]  D. R. Penn,et al.  Wave-Number-Dependent Dielectric Function of Semiconductors , 1962 .

[7]  Changyan Sun.  Origin and Processes of O-Cu(001) and the O-Cu(110) Biphase Ordering , 1998 .

[8]  R. Tsu,et al.  Doping of a quantum dot , 1994 .

[9]  Raphael Tsu,et al.  Simple model for the dielectric constant of nanoscale silicon particle , 1997 .

[10]  M. J. Sinnott,et al.  The Solid State for Engineers , 1959 .

[11]  Friedman,et al.  Size, shape, and composition of luminescent species in oxidized Si nanocrystals and H-passivated porous Si. , 1995, Physical review. B, Condensed matter.

[12]  V. Goldschmidt.  Krystallbau und chemische Zusammensetzung , 1927 .

[13]  Haitao Huang,et al.  Surface bond contraction and its effect on the nanometric sized lead zirconate titanate , 2000 .

[14]  Chang Q. Sun,et al.  Behind the Quantum Confinement and Surface Passivation of Nanoclusters , 1999 .

[15]  Wang,et al.  Pseudopotential calculations of nanoscale CdSe quantum dots. , 1996, Physical review. B, Condensed matter.

[16]  E. Monroy,et al.  Nanoindentation on AlGaN thin films , 1999 .

[17]  Chang Q. Sun,et al.  Frequency shift in the photoluminescence of nanometric SiOx: surface bond contraction and oxidation , 1999 .

[18]  B. Tay,et al.  Tribological Properties of Tetrahedral Carbon Films Deposited by Filtered Cathodic Vacuum Arc Technique , 1996 .

[19]  Allan,et al.  Screening in Semiconductor Nanocrystallites and Its Consequences for Porous Silicon. , 1995, Physical review letters.

[20]  Changyong Sun.  A model of bonding and band-forming for oxides and nitrides , 1998 .

[21]  Changyan Sun.  Exposure-resolved VLEED from the O-Cu(001) : bonding dynamics , 1997 .