Colloidal Semiconductor Quantum Dots with Tunable Surface Composition
- 27 August 2012
- journal article
- letter
- Published by American Chemical Society (ACS) in Nano Letters
- Vol. 12 (9), 4465-4471
- https://doi.org/10.1021/nl3012962
Abstract
Colloidal CdS quantum dots (QDs) were synthesized with tunable surface composition. Surface stoichiometry was controlled by applying reactive secondary phosphine sulfide precursors in a layer-by-layer approach. The surface composition was observed to greatly affect photoluminescence properties. Band edge emission was quenched in sulfur terminated CdS QDs and fully recovered when QDs were cadmium terminated. Calculations suggest that electronic states inside the band gap arising from surface sulfur atoms could trap charges, thus inhibiting radiative recombination and facilitating nonradiative relaxation.Keywords
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