Journal
ADVANCED MATERIALS
Volume 27, Issue 30, Pages 4481-4486Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201501156
Keywords
lead sulfide; origin of trap states; quantum dots; sub-bandgap emission; trap density
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Funding
- National Science Foundation [DMR-08-19762]
- U.S. Army Research Laboratory
- U.S. Army Research Office through Institute for Soldier Nanotechnologies [W911NF-13-D-0001]
- Samsung Advanced Institute of Technology
- Samsung Scholarship Foundation
- excitonic EFRC at MIT, an Energy Frontier Research Center - U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences (BES) [DE-SC0001088]
- National Institute of Health [9-P41-EB015871-26A1]
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Chemical oxidation of under-charged Pb atoms reduces the density of trap states by a factor of 40 in films of colloidal PbS quantum dots for devices. These emissive sub-bandgap states are a byproduct of several standard ligand-exchange procedures. X-ray photoelectron spectroscopy measurements and density function theory simulations demonstrate that they are associated with under-charged Pb.
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