KAUST Grant NumberKUS-11-009-21
MetadataShow full item record
AbstractUsing first-principles simulations on PbS and CdSe colloidal quantum dots, we find that surface defects form in response to electronic doping and charging of the nanoparticles. We show that electronic trap states in nanocrystals are dynamic entities, in contrast with the conventional picture wherein traps are viewed as stable electronic states that can be filled or emptied, but not created or destroyed. These traps arise from the formation or breaking of atomic dimers at the nanoparticle surface. The dimers' energy levels can reside within the bandgap, in which case a trap is formed. Fortunately, we are also able to identify a number of shallow-electron-affinity cations that stabilize the surface, working to counter dynamic trap formation and allowing for trap-free doping. © 2013 American Chemical Society.
CitationVoznyy O, Thon SM, Ip AH, Sargent EH (2013) Dynamic Trap Formation and Elimination in Colloidal Quantum Dots. The Journal of Physical Chemistry Letters 4: 987–992. Available: http://dx.doi.org/10.1021/jz400125r.
SponsorsThis publication is based in part on work supported by Award KUS-11-009-21, made by King Abdullah University of Science and Technology (KAUST), by the Ontario Research Fund Research Excellence Program, and by the Natural Sciences and Engineering Research Council (NSERC) of Canada. Computations were performed on the GPC supercomputer at the SciNet HPC Consortium.<SUP>44</SUP> SciNet is funded by the Canada Foundation for Innovation under the auspices of Compute Canada, the Government of Ontario, the Ontario Research Fund - Research Excellence, and the University of Toronto.
PublisherAmerican Chemical Society (ACS)
CollectionsPublications Acknowledging KAUST Support
- Surface passivation of lead sulfide nanocrystals with low electron affinity metals: photoluminescence and photovoltaic performance.
- Authors: Tavakoli MM, Mirfasih MH, Hasanzadeh S, Aashuri H, Simchi A
- Issue date: 2016 Apr 28
- Spatial Mapping of Sub-Bandgap States Induced by Local Nonstoichiometry in Individual Lead Sulfide Nanocrystals.
- Authors: Kislitsyn DA, Gervasi CF, Allen T, Palomaki PK, Hackley JD, Maruyama R, Nazin GV
- Issue date: 2014 Nov 6
- Diversity of sub-bandgap states in lead-sulfide nanocrystals: real-space spectroscopy and mapping at the atomic-scale.
- Authors: Gervasi CF, Kislitsyn DA, Allen TL, Hackley JD, Maruyama R, Nazin GV
- Issue date: 2015 Dec 14
- Role of bond adaptability in the passivation of colloidal quantum dot solids.
- Authors: Thon SM, Ip AH, Voznyy O, Levina L, Kemp KW, Carey GH, Masala S, Sargent EH
- Issue date: 2013 Sep 24
- Identifying and Eliminating Emissive Sub-bandgap States in Thin Films of PbS Nanocrystals.
- Authors: Hwang GW, Kim D, Cordero JM, Wilson MWB, Chuang CM, Grossman JC, Bawendi MG
- Issue date: 2015 Aug