Identifying and Eliminating Emissive Sub-bandgap States in Thin Films of PbS Nanocrystals.
basic_science · Level V
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- Record sourced from PubMed, PMID 26134373.
- Also identified by DOI 10.1002/adma.201501156 and PMC identifier 4755932.
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Abstract
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 spectro-scopy measurements and density function theory simulations demonstrate that they are associated with under-charged Pb.