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dc.contributor.authorEita, Mohamed Samir
dc.contributor.authorUsman, Anwar
dc.contributor.authorEl Ballouli, Ala'a
dc.contributor.authorAlarousu, Erkki
dc.contributor.authorBakr, Osman
dc.contributor.authorMohammed, Omar F.
dc.date.accessioned2015-08-03T12:07:40Z
dc.date.available2015-08-03T12:07:40Z
dc.date.issued2014-08-28
dc.identifier.citationEita, M., Usman, A., El-Ballouli, A. O., Alarousu, E., Bakr, O. M., & Mohammed, O. F. (2014). A Layer-by-Layer ZnO Nanoparticle-PbS Quantum Dot Self-Assembly Platform for Ultrafast Interfacial Electron Injection. Small, 11(1), 112–118. doi:10.1002/smll.201400939
dc.identifier.issn16136810
dc.identifier.pmid25163799
dc.identifier.doi10.1002/smll.201400939
dc.identifier.urihttp://hdl.handle.net/10754/563719
dc.description.abstractAbsorbent layers of semiconductor quantum dots (QDs) are now used as material platforms for low-cost, high-performance solar cells. The semiconductor metal oxide nanoparticles as an acceptor layer have become an integral part of the next generation solar cell. To achieve sufficient electron transfer and subsequently high conversion efficiency in these solar cells, however, energy-level alignment and interfacial contact between the donor and the acceptor units are needed. Here, the layer-by-layer (LbL) technique is used to assemble ZnO nanoparticles (NPs), providing adequate PbS QD uptake to achieve greater interfacial contact compared with traditional sputtering methods. Electron injection at the PbS QD and ZnO NP interface is investigated using broadband transient absorption spectroscopy with 120 femtosecond temporal resolution. The results indicate that electron injection from photoexcited PbS QDs to ZnO NPs occurs on a time scale of a few hundred femtoseconds. This observation is supported by the interfacial electronic-energy alignment between the donor and acceptor moieties. Finally, due to the combination of large interfacial contact and ultrafast electron injection, this proposed platform of assembled thin films holds promise for a variety of solar cell architectures and other settings that principally rely on interfacial contact, such as photocatalysis. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
dc.publisherWiley
dc.subjectElectron injection
dc.subjectFemtosecond transient absorption spectroscopy
dc.subjectHeterojunctions
dc.subjectLayer-by-layer
dc.subjectPbS quantum dots
dc.subjectZnO nanoparticles
dc.titleA layer-by-layer ZnO nanoparticle-PbS quantum dot self-assembly platform for ultrafast interfacial electron injection
dc.typeArticle
dc.contributor.departmentChemical Science Program
dc.contributor.departmentFunctional Nanomaterials Lab (FuNL)
dc.contributor.departmentKAUST Catalysis Center (KCC)
dc.contributor.departmentKAUST Solar Center (KSC)
dc.contributor.departmentMaterial Science and Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.contributor.departmentUltrafast Laser Spectroscopy and Four-dimensional Electron Imaging Research Group
dc.identifier.journalSmall
kaust.personEita, Mohamed Samir
kaust.personUsman, Anwar
kaust.personAlarousu, Erkki
kaust.personBakr, Osman M.
kaust.personMohammed, Omar F.
kaust.personEl Ballouli, Ala'a
dc.date.published-online2014-08-28
dc.date.published-print2015-01


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