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Dostęp zamkniętyPerovskite-quantum dots interface: Deciphering its ultrafast charge carrier dynamics
| dc.abstract.en | Understanding electron and hole (e,h) transport at semiconductor interfaces is paramount to developing efficient optoelectronic devices. Halide perovskite/semiconductor quantum dots (QDs) have emerged as smart hybrid systems with a huge potential for light emission and energy conversion. However, the dynamics of generated e-h pairs are not fully understood. Ultrafast UV–VIS transient absorption and THz spectroscopies have enabled us to unravel the processes of the e-h recombination within a hybrid film of methylammonium lead triiodide (MAPbI3) interacting with different amount of PbS/CdS core/shell QDs. To accurately analyze the complex behavior, we applied a new model for e-h events in this hybrid material. The results obtained with sample having a high concentration of QDs (7.3 mass percentage) indicate: (i) a large population (92%) of the photogenerated charge carriers are affected by QDs presence. The main part of these carriers (85% of the total) in perovskite domain diffuse towards QDs, where they transfer to the interface (electrons) and QD´s valence bands (holes) with rate constants of 1.2 × 1010 s−1 and 4.6 × 1010 s−1, respectively. 7% of these affected charged entities are excitons in the perovskite domain in close vicinity of the interface, and show a recombination rate constant of 3.7 × 1010 s−1. (ii) The carriers not affected by QDs presence (8%) recombine through known perovskite deactivation channels. Lowering the QDs mass percentage to 0.24 causes a decrease of electron and hole effective transfer rate constants, and disappearance of excitons. These results provide clues to improve the performance of perovskite/QD based devices. |
| dc.affiliation | Uniwersytet Warszawski |
| dc.contributor.author | Gutiérrez, Mario |
| dc.contributor.author | Mora-Seró, Iván |
| dc.contributor.author | Piątkowski, Piotr |
| dc.contributor.author | Douhal, Abderrazzak |
| dc.contributor.author | Ngo, Thi Tuyen |
| dc.contributor.author | Galar, Pavel |
| dc.date.accessioned | 2024-01-25T16:35:07Z |
| dc.date.available | 2024-01-25T16:35:07Z |
| dc.date.issued | 2018 |
| dc.description.finance | Nie dotyczy |
| dc.description.volume | 49 |
| dc.identifier.doi | 10.1016/J.NANOEN.2018.04.069 |
| dc.identifier.issn | 2211-2855 |
| dc.identifier.uri | https://repozytorium.uw.edu.pl//handle/item/115724 |
| dc.language | eng |
| dc.pbn.affiliation | chemical sciences |
| dc.relation.ispartof | Nano Energy |
| dc.relation.pages | 471-480 |
| dc.rights | ClosedAccess |
| dc.sciencecloud | nosend |
| dc.subject.en | Perovskite |
| dc.subject.en | Quantum dots |
| dc.subject.en | LEDs |
| dc.subject.en | Lighting |
| dc.subject.en | Hybrid nanostructures |
| dc.subject.en | Electron and hole dynamics |
| dc.title | Perovskite-quantum dots interface: Deciphering its ultrafast charge carrier dynamics |
| dc.type | JournalArticle |
| dspace.entity.type | Publication |