Identifying and Eliminating Emissive Sub-bandgap States in Thin Films of PbS Nanocrystals

Author(s)
Hwang, Gyuweon; Kim, Donghun; Cordero Hernandez, Jose M.; Wilson, Mark William Brennan; Chuang, Chia-Hao Marcus; ... Show more
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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 spectroscopy measurements and density function theory simulations demonstrate that they are associated with under-charged Pb.
Date issued
2015-07
URI
http://hdl.handle.net/1721.1/111826
Department
Massachusetts Institute of Technology. Department of Chemistry; Massachusetts Institute of Technology. Department of Materials Science and Engineering; Massachusetts Institute of Technology. Research Laboratory of Electronics
Journal
Advanced Materials
Publisher
Wiley-Blackwell
Citation
Hwang, Gyu Weon et al. "Identifying and Eliminating Emissive Sub-bandgap States in Thin Films of PbS Nanocrystals." Advanced Materials 27, 30 (July 2015): 4481–4486 © 2015 WILEY-VCH Verlag GmbH & Co.
Version: Author's final manuscript
ISSN
0935-9648
1521-4095
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