Physics – Condensed Matter – Materials Science
Scientific paper
2009-02-17
Appl. Phys. Lett. 94, 091908 (2009)
Physics
Condensed Matter
Materials Science
The article has been accepted by Applied Physics Letters. After it is published, it will be found at http://apl.aip.org
Scientific paper
10.1063/1.3094751
The effect of temperature controlled annealing on the confined valence electron states in CdSe nanocrystal arrays, deposited as thin films, was studied using two-dimensional angular correlation of annihilation radiation (2D-ACAR). A reduction in the intensity by ~35% was observed in a feature of the positron annihilation spectrum upon removal of the pyridine capping molecules above 200 degrees Celsius in a vacuum. This reduction is explained by an increased electronic interaction of the valence orbitals of neighboring nanocrystals, induced by the formation of inorganic interfaces. Partial evaporation of the nanoporous CdSe layer and additional sintering into a polycrystalline thin film was observed at a relatively low temperature of ~486 degrees Celsius.
Bansil Arun
Barbiellini Bernardo
Eijt S. W. H.
Houtepen A. J.
Mijnarends P. E.
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