Journal
SCIENTIFIC REPORTS
Volume 6, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/srep28510
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Funding
- MOE Academic Research Funds Tier 1 (Singapore) [2014-T1-001-098]
- MOE Academic Research Funds Tier 2 (Singapore) [2013-T2-1-044]
- ICREA Funding Source: Custom
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Excited state dynamics in two strong organic electron acceptor systems, TCNQ and F(4)TCNQ single crystals, was studied. After absorption of a single photon, dianions are formed in both crystals on ultrashort timescale: TCNQ tau < 50 fs, F(4)TCNQ tau = 4 ps. By use of transient absorption spectroscopy, we demonstrate that the dianion formation in F(4)TCNQ is mediated by the radical anion precursor which is described by a two-step model. Our measurements show the phenomenon that in this quinoid acceptor crystals in the absence of additional donor molecule, it is possible to resolve the two step formation of a doubly charged anion upon absorption of a single low energy photon (2.6 eV).
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