Applied Physics Express · 2012 · 34 citations · 20 references
Natural SciencesMaterials SciencePhysicsElectronic MaterialsOrganic ChemistrySemiconductor MaterialsOrganic Electronic MaterialsOrganic SemiconductorsPhotovoltaic DevicesPhotovoltaic MaterialsSolar Cell MaterialsSolar CellsCharge Carrier DynamicsCharge DynamicsCharge Transfer DynamicsExcitationExciton DynamicsOrganic PhotovoltaicsOrganic Solar CellsUltrafast Carrier Dynamics
Bulk heterojunction (BHJ) based on a donor (D) polymer and an acceptor (A) fullerene derivative is a promising organic photovoltaic. Here, we investigated the femtosecond charge dynamics after acceptor excitation in poly[[4,8-bis[(2-ethylhexyl)oxy]benzo[1,2-b:4,5-b '] dithiophene-2,6-diyl][3-fluoro-2-[(2-ethylhexyl)carbonyl]thieno[3,4-b] thiophenediyl]] (PTB7)/[6,6]-phenyl C71-butyric acid methyl ester (PC70BM), which is a low-gap (Egap≈1.6 eV) organic photovoltaic. We observed fast conversion from the acceptor exciton (A*) to the donor polaron (D+) within τrise = 0.45 ps. The fast carrier formation is ascribed to the prompt charge transfer of an electron from the D highest occupied molecular orbital (HOMO) to the A HOMO.
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Photoinduced Electron Transfer from a Conducting Polymer to Buckminsterfullerene
Niyazi Serdar Sariçiftçi, Laura Smilowitz, A. J. Heeger et al. · Science · 1992 · 4.2K citations
Youngkyoo Kim, Steffan Cook, Sachetan M. Tuladhar et al. · Nature Materials · 2006 · 2.3K citations · Full text
Natural Sciences, Materials Engineering, Materials Science +17