期刊
NANO LETTERS
卷 12, 期 9, 页码 4465-4471出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl3012962
关键词
Semiconductor nanocrystals; photoluminescence; synthesis; surface composition; nonradiative relaxation
类别
资金
- National Science Foundation [CHE-1012681]
- Department of Energy [DE-FG02-05ER15755, DE-FG02-11ER16221]
- National Science Foundation Materials Research Science and Engineering Centers (MRSEC) program [DMR 1120296]
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1012681] Funding Source: National Science Foundation
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.
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