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Issue 38, 2018
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Influence of conjugation length on ultrafast electronic tunneling in organic semiconductor thin films

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Abstract

Electron delocalization in conjugated organic molecules is a rate-limiting step in maximizing the charge generation efficiency of next generation photovoltaics and molecular electronics. In particular, ultrafast (<50 fs) delocalization is an important aspect that has been beyond the scope of traditional optical experiments. In this work, we use resonant photoemission spectroscopy to probe electron delocalization timescales as a function of conjugation length by examining an oligothiophene chemical series containing 4-, 5- and 6-mers. We find that above a certain photon energy threshold, the 5-mer, quinquenthiophene, displays the largest ultrafast tunneling rates, roughly three times faster than the 6-mer, sexithiophene. We argue that differences in thin-film molecular packing cannot satisfactorily explain our results, and we speculate that the differences in ultrafast electron dynamics may be a manifestation of the odd/even effect.

Graphical abstract: Influence of conjugation length on ultrafast electronic tunneling in organic semiconductor thin films

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Publication details

The article was received on 26 Jul 2018, accepted on 18 Sep 2018 and first published on 19 Sep 2018


Article type: Paper
DOI: 10.1039/C8CP04746D
Citation: Phys. Chem. Chem. Phys., 2018,20, 25085-25095

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    Influence of conjugation length on ultrafast electronic tunneling in organic semiconductor thin films

    V. V. Duong and A. L. Ayzner, Phys. Chem. Chem. Phys., 2018, 20, 25085
    DOI: 10.1039/C8CP04746D

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