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dc.contributor.authorAly, Shawkat Mohammede
dc.contributor.authorGoswami, Subhadip
dc.contributor.authorAlsulami, Qana
dc.contributor.authorSchanze, Kirk S.
dc.contributor.authorMohammed, Omar F.
dc.date.accessioned2016-01-19T13:21:42Z
dc.date.available2016-01-19T13:21:42Z
dc.date.issued2014-09-18
dc.identifier.citationAly SM, Goswami S, Alsulami QA, Schanze KS, Mohammed OF (2014) Ultrafast Photoinduced Electron Transfer in a π-Conjugated Oligomer/Porphyrin Complex. The Journal of Physical Chemistry Letters 5: 3386–3390. Available: http://dx.doi.org/10.1021/jz5018174.
dc.identifier.issn1948-7185
dc.identifier.pmid26278449
dc.identifier.doi10.1021/jz5018174
dc.identifier.urihttp://hdl.handle.net/10754/594103
dc.description.abstractControlling charge transfer (CT), charge separation (CS), and charge recombination (CR) at the donor-acceptor interface is extremely important to optimize the conversion efficiency in solar cell devices. In general, ultrafast CT and slow CR are desirable for optimal device performance. In this Letter, the ultrafast excited-state CT between platinum oligomer (DPP-Pt(acac)) as a new electron donor and porphyrin as an electron acceptor is monitored for the first time using femtosecond (fs) transient absorption (TA) spectroscopy with broad-band capability and 120 fs temporal resolution. Turning the CT on/off has been shown to be possible either by switching from an organometallic oligomer to a metal-free oligomer or by controlling the charge density on the nitrogen atom of the porphyrin meso unit. Our time-resolved data show that the CT and CS between DPP-Pt(acac) and cationic porphyrin are ultrafast (approximately 1.5 ps), and the CR is slow (ns time scale), as inferred from the formation and the decay of the cationic and anionic species. We also found that the metallic center in the DPP-Pt(acac) oligomer and the positive charge on the porphyrin are the keys to switching on/off the ultrafast CT process.
dc.description.sponsorshipS.M.A. is grateful for the postdoctoral fellowship provided by Saudi Basic Industries Corporation (SABIC). The work reported here was supported by the King Abdullah University of Science and Technology. Work at the University of Florida was supported by the U.S. National Science Foundation (Grant No. CHE-115164).
dc.publisherAmerican Chemical Society (ACS)
dc.subjectcationic porphyrin
dc.subjectfemtosecond transient absorption spectroscopy
dc.subjectplatinum oligomer
dc.subjectultrafast charge transfer
dc.titleUltrafast Photoinduced Electron Transfer in a π-Conjugated Oligomer/Porphyrin Complex
dc.typeArticle
dc.contributor.departmentChemical Science Program
dc.contributor.departmentKAUST Solar Center (KSC)
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.contributor.departmentUltrafast Laser Spectroscopy and Four-dimensional Electron Imaging Research Group
dc.identifier.journalThe Journal of Physical Chemistry Letters
dc.contributor.institutionDepartment of Chemistry, University of Florida, P.O. Box 117200Gainesville, FL, United States
kaust.personAly, Shawkat Mohammede
kaust.personAlsulami, Qana
kaust.personMohammed, Omar F.
dc.date.published-online2014-09-18
dc.date.published-print2014-10-02


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