Identifying and Eliminating Emissive Sub-bandgap States in Thin Films of PbS Nanocrystals
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 de...
| Main Authors: | , , , , , , |
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| Format: | Article |
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Wiley-Blackwell
2017
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| Online Access: | http://hdl.handle.net/1721.1/111826 https://orcid.org/0000-0002-2288-3735 https://orcid.org/0000-0002-6419-4129 https://orcid.org/0000-0002-1694-4722 https://orcid.org/0000-0002-1957-2979 https://orcid.org/0000-0003-0808-6518 https://orcid.org/0000-0003-1281-2359 https://orcid.org/0000-0003-2220-4365 |
| Summary: | 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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