Identifying and Eliminating Emissive Sub-Bandgap States in Thin Films of PbS Nanocrystals
슈퍼관리자
2021-05-21
Identifying and Eliminating Emissive Sub-Bandgap States in Thin Films of PbS Nanocrystals
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Authors :
GW Hwang, D Kim, JM Cordero, MWB Wilson, CHM Chuang, JC Grossman, MG Bawendi
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Journal :
Advanced Materials
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Vol :
27
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Page :
4481
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Year :
2015
Abstract
AbstractChemical 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.
