Journal article
Surface plasmon-mediated photoluminescence boost in graphene-covered CsPbBr3 quantum dots
- Abstract:
-
The optical properties of graphene (Gr)-covered CsPbBr3 quantum dots (QDs) were investigated using micro-photoluminescence spectroscopy, revealing a remarkable three orders of magnitude enhancement in photoluminescence (PL) intensity compared to bare CsPbBr3 QDs. To elucidate the underlying mechanisms, we combined experimental techniques with density functional theory (DFT) calculations. DFT simulations showed that the graphene layer generates interfacial electrostatic potential barriers when in contact with the CsPbBr3 surface, impeding carrier leakage from perovskite to graphene and enhancing radiative recombination. Additionally, graphene passivates CsPbBr3 surface defect states, suppressing nonradiative recombination of photo-generated carriers. Our study also revealed that graphene becomes n-doped upon contact with CsPbBr3 QDs, activating its plasmon mode. This mode resonantly couples with photo-generated excitons in the perovskite. The momentum mismatch between graphene plasmons and free-space photons is resolved through plasmon scattering at Gr/CsPbBr3 interface corrugations, facilitating the observed super-bright emission. These findings highlight the critical role of graphene as a top contact in dramatically enhancing CsPbBr3 QDs’ PL. Our work advances the understanding of graphene-perovskite interfaces and opens new avenues for designing high-efficiency optoelectronic devices. The multifaceted enhancement mechanisms uncovered provide valuable insights for future research in nanophotonics and materials science, potentially leading to breakthroughs in light-emitting technologies.
- Publication status:
- Published
- Peer review status:
- Peer reviewed
Actions
Access Document
- Files:
-
-
(Preview, Accepted manuscript, pdf, 1.3MB, Terms of use)
-
- Publisher copy:
- 10.1016/j.apsusc.2024.161601
Authors
- Funder identifier:
- https://ror.org/013aysd81
- Publisher:
- Elsevier
- Journal:
- Applied Surface Science More from this journal
- Volume:
- 681
- Article number:
- 161601
- Publication date:
- 2024-10-22
- Acceptance date:
- 2024-10-20
- DOI:
- EISSN:
-
1873-5584
- ISSN:
-
0169-4332
- Language:
-
English
- Keywords:
- Pubs id:
-
2054100
- Local pid:
-
pubs:2054100
- Deposit date:
-
2024-12-13
Terms of use
- Copyright holder:
- Elsevier B.V.
- Copyright date:
- 2024
- Rights statement:
- © 2024 Elsevier B.V. All rights are reserved, including those for text and data mining, AI training, and similar technologies.
- Notes:
-
The author accepted manuscript (AAM) of this paper has been made available under the University of Oxford’s Open Access Publications Policy, and a CC BY public copyright licence has been applied.
This is the accepted manuscript version of the article. The final version is available online from Elsevier at https://dx.doi.org/10.1016/j.apsusc.2024.161601
- Licence:
- CC Attribution (CC BY)
If you are the owner of this record, you can report an update to it here: Report update to this record