Identifying and Eliminating Emissive Sub-bandgap States in Thin Films of PbS Nanocrystals
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Grossman_Identifying and eliminating.pdf
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Author(s)
Hwang, Gyuweon
Kim, Donghun
Cordero Hernandez, Jose M.
Wilson, Mark William Brennan
Chuang, Chia-Hao Marcus
Grossman, Jeffrey C.
Bawendi, Moungi G
Date Issued
July 2015
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
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.
MIT 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
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Creative Commons Attribution-Noncommercial-Share Alike
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DOI of Published Version
https://doi.org/10.1002/ADMA.201501156
