Full metadata record
DC Field | Value | Language |
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dc.citation.endPage | 1021 | - |
dc.citation.number | 8 | - |
dc.citation.startPage | 1013 | - |
dc.citation.title | NATURE MATERIALS | - |
dc.citation.volume | 22 | - |
dc.contributor.author | Jin, Ho | - |
dc.contributor.author | Livache, Clement | - |
dc.contributor.author | Kim, Whi Dong | - |
dc.contributor.author | Diroll, Benjamin T. | - |
dc.contributor.author | Schaller, Richard D. | - |
dc.contributor.author | Klimov, Victor I. | - |
dc.date.accessioned | 2024-03-11T17:05:09Z | - |
dc.date.available | 2024-03-11T17:05:09Z | - |
dc.date.created | 2024-03-11 | - |
dc.date.issued | 2023-08 | - |
dc.description.abstract | Carrier multiplication generates multiple excitons for each absorbed photon but is normally limited by fast phonon-assisted relaxation. Here the authors achieve a threefold enhancement in multiexciton yields in Mn-doped PbSe/CdSe quantum dots, due to very fast spin-exchange interactions between Mn ions and the quantum dots that outpace energy losses arising from phonon emission. Carrier multiplication is a process whereby a kinetic energy of a carrier relaxes via generation of additional electron-hole pairs (excitons). This effect has been extensively studied in the context of advanced photoconversion as it could boost the yield of generated excitons. Carrier multiplication is driven by carrier-carrier interactions that lead to excitation of a valence-band electron to the conduction band. Normally, the rate of phonon-assisted relaxation exceeds that of Coulombic collisions, which limits the carrier multiplication yield. Here we show that this limitation can be overcome by exploiting not 'direct' but 'spin-exchange' Coulomb interactions in manganese-doped core/shell PbSe/CdSe quantum dots. In these structures, carrier multiplication occurs via two spin-exchange steps. First, an exciton generated in the CdSe shell is rapidly transferred to a Mn dopant. Then, the excited Mn ion undergoes spin-flip relaxation via a spin-conserving pathway, which creates two excitons in the PbSe core. Due to the extremely fast, subpicosecond timescales of spin-exchange interactions, the Mn-doped quantum dots exhibit an up-to-threefold enhancement of the multiexciton yield versus the undoped samples, which points towards the considerable potential of spin-exchange carrier multiplication in advanced photoconversion. | - |
dc.identifier.bibliographicCitation | NATURE MATERIALS, v.22, no.8, pp.1013 - 1021 | - |
dc.identifier.doi | 10.1038/s41563-023-01598-x | - |
dc.identifier.issn | 1476-1122 | - |
dc.identifier.scopusid | 2-s2.0-85164814180 | - |
dc.identifier.uri | https://scholarworks.unist.ac.kr/handle/201301/81532 | - |
dc.identifier.wosid | 001027469100003 | - |
dc.language | 영어 | - |
dc.publisher | NATURE PORTFOLIO | - |
dc.title | Spin-exchange carrier multiplication in manganese-doped colloidal quantum dots | - |
dc.type | Article | - |
dc.description.isOpenAccess | TRUE | - |
dc.relation.journalWebOfScienceCategory | Chemistry, Physical; Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter | - |
dc.relation.journalResearchArea | Chemistry; Materials Science; Physics | - |
dc.type.docType | Article; Early Access | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.subject.keywordPlus | MULTIPLE EXCITON GENERATION | - |
dc.subject.keywordPlus | SEMICONDUCTOR NANOCRYSTALS | - |
dc.subject.keywordPlus | ELECTRONIC-STRUCTURE | - |
dc.subject.keywordPlus | OPTICAL-PROPERTIES | - |
dc.subject.keywordPlus | EFFICIENCY | - |
dc.subject.keywordPlus | PBSE | - |
dc.subject.keywordPlus | DYNAMICS | - |
dc.subject.keywordPlus | YIELDS | - |
dc.subject.keywordPlus | RELAXATION | - |
dc.subject.keywordPlus | MN | - |
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