Ultrafast Photoinduced Electron Transfer in a π-Conjugated Oligomer/Porphyrin Complex

Handle URI:
http://hdl.handle.net/10754/594103
Title:
Ultrafast Photoinduced Electron Transfer in a π-Conjugated Oligomer/Porphyrin Complex
Authors:
Aly, Shawkat Mohammede ( 0000-0002-0455-1892 ) ; Goswami, Subhadip; Alsulami, Qana ( 0000-0001-5481-5414 ) ; Schanze, Kirk S.; Mohammed, Omar F. ( 0000-0001-8500-1130 )
Abstract:
Controlling 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.
KAUST Department:
Physical Sciences and Engineering (PSE) Division; Solar and Photovoltaic Engineering Research Center (SPERC)
Citation:
Aly 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.
Publisher:
American Chemical Society (ACS)
Journal:
The Journal of Physical Chemistry Letters
Issue Date:
2-Oct-2014
DOI:
10.1021/jz5018174
PubMed ID:
26278449
Type:
Article
ISSN:
1948-7185
Sponsors:
S.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).
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Solar and Photovoltaic Engineering Research Center (SPERC)

Full metadata record

DC FieldValue Language
dc.contributor.authorAly, Shawkat Mohammedeen
dc.contributor.authorGoswami, Subhadipen
dc.contributor.authorAlsulami, Qanaen
dc.contributor.authorSchanze, Kirk S.en
dc.contributor.authorMohammed, Omar F.en
dc.date.accessioned2016-01-19T13:21:42Zen
dc.date.available2016-01-19T13:21:42Zen
dc.date.issued2014-10-02en
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.en
dc.identifier.issn1948-7185en
dc.identifier.pmid26278449en
dc.identifier.doi10.1021/jz5018174en
dc.identifier.urihttp://hdl.handle.net/10754/594103en
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.en
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).en
dc.publisherAmerican Chemical Society (ACS)en
dc.subjectcationic porphyrinen
dc.subjectfemtosecond transient absorption spectroscopyen
dc.subjectplatinum oligomeren
dc.subjectultrafast charge transferen
dc.titleUltrafast Photoinduced Electron Transfer in a π-Conjugated Oligomer/Porphyrin Complexen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentSolar and Photovoltaic Engineering Research Center (SPERC)en
dc.identifier.journalThe Journal of Physical Chemistry Lettersen
dc.contributor.institutionDepartment of Chemistry, University of Florida, P.O. Box 117200Gainesville, FL, United Statesen
kaust.authorAly, Shawkat Mohammedeen
kaust.authorAlsulami, Qanaen
kaust.authorMohammed, Omar F.en

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