|Title||Identifying and Eliminating Emissive Sub-bandgap States in Thin Films of PbS Nanocrystals|
|Publication Type||Journal Article|
|Year of Publication||2015|
|Authors||Hwang, GWeon, Kim, D, Cordero, JM, Wilson, MWB, Chuang, C-HM, Grossman, JC, Bawendi, MG|
|Pagination||4481 - 4486|
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.