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Article: Type‐I Energy Level Alignment at the PTCDA—Monolayer MoS2 Interface Promotes Resonance Energy Transfer and Luminescence Enhancement

TitleType‐I Energy Level Alignment at the PTCDA—Monolayer MoS2 Interface Promotes Resonance Energy Transfer and Luminescence Enhancement
Authors
Keywordsenergy level alignment
energy transfer
MoS2
organic semiconductors
photoelectron spectroscopy
Issue Date2021
PublisherWiley Open Access. The Journal's web site is located at http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)2198-3844
Citation
Advanced Science, 2021, v. 8 n. 12, p. article no. 2100215 How to Cite?
AbstractVan der Waals heterostructures consisting of 2D semiconductors and conjugated molecules are of increasing interest because of the prospect of a synergistic enhancement of (opto)electronic properties. In particular, perylenetetracarboxylic dianhydride (PTCDA) on monolayer (ML)-MoS2 has been identified as promising candidate and a staggered type-II energy level alignment and excited state interfacial charge transfer have been proposed. In contrast, it is here found with inverse and direct angle resolved photoelectron spectroscopy that PTCDA/ML-MoS2 supported by insulating sapphire exhibits a straddling type-I level alignment, with PTCDA having the wider energy gap. Photoluminescence (PL) and sub-picosecond transient absorption measurements reveal that resonance energy transfer, i.e., electron–hole pair (exciton) transfer, from PTCDA to ML-MoS2 occurs on a sub-picosecond time scale. This gives rise to an enhanced PL yield from ML-MoS2 in the heterostructure and an according overall modulation of the photoresponse. These results underpin the importance of a precise knowledge of the interfacial electronic structure in order to understand excited state dynamics and to devise reliable design strategies for optimized optoelectronic functionality in van der Waals heterostructures.
Persistent Identifierhttp://hdl.handle.net/10722/305372
ISSN
2023 Impact Factor: 14.3
2023 SCImago Journal Rankings: 3.914
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorPark, S-
dc.contributor.authorMutz, N-
dc.contributor.authorKovalemko, SA-
dc.contributor.authorSchultz, T-
dc.contributor.authorShin, D-
dc.contributor.authorApjard, A-
dc.contributor.authorLi, LJ-
dc.contributor.authorTung, V-
dc.contributor.authorAmsalem, P-
dc.contributor.authorList-Kratochvil, EJ-
dc.contributor.authorStahler, J-
dc.contributor.authorXu, X-
dc.contributor.authorblumstengli, S-
dc.contributor.authorKoch, N-
dc.date.accessioned2021-10-20T10:08:29Z-
dc.date.available2021-10-20T10:08:29Z-
dc.date.issued2021-
dc.identifier.citationAdvanced Science, 2021, v. 8 n. 12, p. article no. 2100215-
dc.identifier.issn2198-3844-
dc.identifier.urihttp://hdl.handle.net/10722/305372-
dc.description.abstractVan der Waals heterostructures consisting of 2D semiconductors and conjugated molecules are of increasing interest because of the prospect of a synergistic enhancement of (opto)electronic properties. In particular, perylenetetracarboxylic dianhydride (PTCDA) on monolayer (ML)-MoS2 has been identified as promising candidate and a staggered type-II energy level alignment and excited state interfacial charge transfer have been proposed. In contrast, it is here found with inverse and direct angle resolved photoelectron spectroscopy that PTCDA/ML-MoS2 supported by insulating sapphire exhibits a straddling type-I level alignment, with PTCDA having the wider energy gap. Photoluminescence (PL) and sub-picosecond transient absorption measurements reveal that resonance energy transfer, i.e., electron–hole pair (exciton) transfer, from PTCDA to ML-MoS2 occurs on a sub-picosecond time scale. This gives rise to an enhanced PL yield from ML-MoS2 in the heterostructure and an according overall modulation of the photoresponse. These results underpin the importance of a precise knowledge of the interfacial electronic structure in order to understand excited state dynamics and to devise reliable design strategies for optimized optoelectronic functionality in van der Waals heterostructures.-
dc.languageeng-
dc.publisherWiley Open Access. The Journal's web site is located at http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)2198-3844-
dc.relation.ispartofAdvanced Science-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.subjectenergy level alignment-
dc.subjectenergy transfer-
dc.subjectMoS2-
dc.subjectorganic semiconductors-
dc.subjectphotoelectron spectroscopy-
dc.titleType‐I Energy Level Alignment at the PTCDA—Monolayer MoS2 Interface Promotes Resonance Energy Transfer and Luminescence Enhancement-
dc.typeArticle-
dc.identifier.emailLi, LJ: lanceli1@hku.hk-
dc.identifier.authorityLi, LJ=rp02799-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1002/advs.202100215-
dc.identifier.scopuseid_2-s2.0-85105035416-
dc.identifier.hkuros327591-
dc.identifier.volume8-
dc.identifier.issue12-
dc.identifier.spagearticle no. 2100215-
dc.identifier.epagearticle no. 2100215-
dc.identifier.isiWOS:000647110800001-
dc.publisher.placeGermany-

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