colloidal quantum dots offer broad tuning of semiconductor band structure via the quantum size effect. in this paper, we present a detailed investigation on the influence of the thickness of colloidal lead sulfide (pbs) nanocrystals (active layer) to the photovoltaic performance of colloidal quantum dot solar cells. the pbs nanocrystals (qds) were synthesized in a non-coordinating solvent, 1-oc...

Recent observation of efficient light emission from porous silicon has attracted much attention and renewed interests in the study of nonlinear optical properties of nanometer-sized quantum systems. In this paper, we study the third-order nonlinear optical susceptibility of semiconductor quantum wires. The quantum wires are taken to be circular columns with a cross section size of —1 nm. The ex...

This paper presents an exact closed-form solution for the Eshelby problem of polygonal inclusion in anisotropic piezoelectric fulland half-planes. Based on the equivalent body-force concept of eigenstrain, the induced elastic and piezoelectric 4elds are 4rst expressed in terms of line integral on the boundary of the inclusion with the integrand being the Green’s function. Using the recently der...

Abslract Boundary effects play an essential role in determining the physical properties of semiconductor quantum wires. Additional features come into play when one considers inhomogeneous boundaries, i.e. wires whose widths are functions of distance along the length of the wire. We show that, in the adiabatic approximation (which assumes that the boundary patential fluctuation effects, or equiv...

We discuss the theory of cooling electrons in solid-state devices via “evaporative emission.” Our model is based on filtering electron subbands in a quantum-wire device. When incident electrons in a higher-energy subband scatter out of the initial electron distribution, the system equilibrates to a different chemical potential and temperature than those of the incident electron distribution. We...

The inf luence of an e lec t r i c f i e l d on weak loca l i za t ion in a semiconductor quantum wire is studied by a recently proposed generalized quantum Langevin equation approach to the conduct iv i ty problem. A new physical p icture is presented. In our model the e lect ronic motion is essent ia l ly one-dimensional, and the phase coherence length I¢ is much larger than the e las t i c m...

R EV EW A R IC LE Abstract In the past two decades, semiconductor quantum dots and wires have developed into new, promising classes of materials for next-generation lighting and display systems due to their superior optical properties. In particular, exciton–exciton interactions through nonradiative energy transfer in hybrid systems of these quantum-confined structures have enabled exciting pos...

6 SO COUPLINGS IN LOW-DIMENSIONAL SEMICONDUCTORS 10 6.1 Rashba coupling in bulk 2DEG . . . . . . . . . . . . . . . . . . . . . . . . . . 13 6.2 Rashba coupling in quantum wires . . . . . . . . . . . . . . . . . . . . . . . . 15 6.2.1 Energy dispersion of Rashba spin-split transverse propagating subbands 15 6.2.2 Spin precession in Rashba quantum wires . . . . . . . . . . . . . . . . . 17 6.3 Di...