Size Quantization in Layered Semiconductor Colloids with Tetrahedral Bonding: HgI2

O. I. Micic, M. T. Nenadovic, M. W. Peterson, A. J. Nozik

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Small-particle-size colloids of red HgI2 show relatively sharp blue-shifted optical absorption peaks in the UV that are attributed to size quantization effects. Within the framework of a simple model that only considers transitions between the lowest quantum states of electrons and holes in HgI2, the optical data are consistent with crystallite structures containing up to four HgI2 layers with dimensions in the layer plane ranging from 10 to 26 Å. The lowest two energy peaks could not be accommodated by particles containing only a single layer of HgI2. Published data on layered PbI2 colloids are also believed to be incompatible with a single PbI2 layer if more acceptable values of the effective masses for electrons and holes in PbI2 are used in the analysis. Preliminary calculations indicate that the optical data are also consistent with a single particle size showing multiple transitions between higher energy quantum levels of electrons and holes. The possible existence of magic number in HgI2 colloids is inconclusive based on the optical data and electron microscopy.

Original languageAmerican English
Pages (from-to)1295-1297
Number of pages3
JournalJournal of Physical Chemistry
Issue number6
StatePublished - 1987

Bibliographical note

Work performed by Boris Kidric Institute of Nuclear Science, Beograde, Yugoslavia and Solar Fuels Research Division, Solar Energy Research Institute, Golden, Colorado

NREL Publication Number

  • ACNR/JA-236-10104


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