Shape-dependent confinement in ultrasmall zero-, one-, and two-dimensional PbS nanostructures

Somobrata Acharya, D. D. Sarma, Yuval Golan, Sucheta Sengupta, Katsuhiko Ariga

Research output: Contribution to journalArticlepeer-review

72 Scopus citations

Abstract

(Figure Presented) Spatial dimensionality affects the degree of confinement when an electron-hole pair is squeezed from one or more dimensions approaching the bulk exciton Bohr radius (aB) limit. The electron-hole interaction in zero-dimensional (0D) dots, one-dimensional (1D) rods/wires, and two-dimensional (2D) wells/sheets should be enhanced by the increase in confinement dimensions in the order 0D > 1D > 2D. We report the controlled synthesis of PbS nanomaterials with 0D, 1D, and 2D forms retaining at least one dimension in the strongly confined regime far below aB (∼10 nm for PbS) and provide evidence through varying the exciton-phonon coupling strength that the degree of confinement is systematically weakened by the loss of confinement dimension. Geometry variations show distinguishable far-field optical polarizations, which could find useful applications in polarization-sensitive devices.

Original languageEnglish
Pages (from-to)11282-11283
Number of pages2
JournalJournal of the American Chemical Society
Volume131
Issue number32
DOIs
StatePublished - 19 Aug 2009

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