2021
DOI: 10.1002/adom.202101914
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The Role of Subsurface Valence Band Localization in the Passivation of Perovskite Nanocrystals

Abstract: Traditional colloidal quantum dots rely on larger‐bandgap semiconductor shells for the localization of excitons in their emissive core. Unshelled quantum dots are typically weakly luminescent due to severe quenching by deep electronic traps. Lead halide perovskite nanocrystals deviate from this convention and require only common monofunctional aliphatic ligands on their surfaces to attain near‐unity luminescence quantum yields. Here, a combination of density functional theory calculations and experimental stud… Show more

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Cited by 4 publications
(2 citation statements)
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“…S3 to S5. The phosphonic group of FBPAc coordinates with Pb-related defects as also demonstrated elsewhere (20,23,24), effectively lowering the population of top-surface nonradiative recombination states (25). Furthermore, the positive impact of FBPAc is mainly observed when C 60 is present: FBPAc likely separates the perovskite from the C 60 layer, reducing the population of deep trap states forming in C 60 when it is in direct contact with the perovskite (11,22).…”
Section: Identification and Mitigation Of Voltage Losses In Perovskit...mentioning
confidence: 81%
See 1 more Smart Citation
“…S3 to S5. The phosphonic group of FBPAc coordinates with Pb-related defects as also demonstrated elsewhere (20,23,24), effectively lowering the population of top-surface nonradiative recombination states (25). Furthermore, the positive impact of FBPAc is mainly observed when C 60 is present: FBPAc likely separates the perovskite from the C 60 layer, reducing the population of deep trap states forming in C 60 when it is in direct contact with the perovskite (11,22).…”
Section: Identification and Mitigation Of Voltage Losses In Perovskit...mentioning
confidence: 81%
“…Overall, this two-step and globally slower crystallization kinetics with the additive likely originates from the interaction between Pb 2+ and FBPAc ( 20 , 23 , 24 ). FBPAc slows down the conversion of the CsBr/PbI 2 template to the perovskite phase because of competition between FBPAc and other perovskite precursors (namely FAI and FABr) for a coordination with Pb 2+ ( 25 , 30 ). Advantageously, this difference in formation kinetics results in films with apparently larger and more clearly defined perovskite domains because FBPAc may inhibit the nucleation of new perovskite grains or domains, as shown by top-view scanning electron microscopy (SEM) images (Fig.…”
Section: Modification Of the Perovskite Crystallization Kinetics And ...mentioning
confidence: 99%