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)
MetadataShow full item record
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)
- Energy and electron transfer in beta-alkynyl-linked porphyrin-fullerene dyads.
- Authors: Vail SA, Schuster DI, Guldi DM, Isosomppi M, Tkachenko N, Lemmetyinen H, Palkar A, Echegoyen L, Chen X, Zhang JZ
- Issue date: 2006 Jul 27
- Molecular-structure Control of Ultrafast Electron Injection at Cationic Porphyrin-CdTe Quantum Dot Interfaces.
- Authors: Aly SM, Ahmed GH, Shaheen BS, Sun J, Mohammed OF
- Issue date: 2015 Mar 5
- Ultrafast photoinduced charge transport in Pt(II) donor-acceptor assembly bearing naphthalimide electron acceptor and phenothiazine electron donor.
- Authors: Sazanovich IV, Best J, Scattergood PA, Towrie M, Tikhomirov SA, Bouganov OV, Meijer AJ, Weinstein JA
- Issue date: 2014 Dec 21
- Ultrafast relaxation dynamics of 5,10,15,20-meso-tetrakis pentafluorophenyl porphyrin studied by fluorescence up-conversion and transient absorption spectroscopy.
- Authors: Kumar PH, Venkatesh Y, Siva D, Ramakrishna B, Bangal PR
- Issue date: 2015 Feb 26
- Electron transfer dynamics and excited state branching in a charge-transfer platinum(II) donor-bridge-acceptor assembly.
- Authors: Scattergood PA, Delor M, Sazanovich IV, Bouganov OV, Tikhomirov SA, Stasheuski AS, Parker AW, Greetham GM, Towrie M, Davies ES, Meijer AJ, Weinstein JA
- Issue date: 2014 Dec 21