Ultrafast Photoinduced Electron Transfer in a π-Conjugated Oligomer/Porphyrin Complex
KAUST DepartmentPhysical Sciences and Engineering (PSE) Division
Chemical Science Program
KAUST Solar Center (KSC)
Permanent link to this recordhttp://hdl.handle.net/10754/594103
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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.
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.
SponsorsS.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).
PublisherAmerican Chemical Society (ACS)
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