Influence of conjugation length on ultrafast electronic tunneling in organic semiconductor thin films.
Identifieur interne : 001F74 ( Ncbi/Merge ); précédent : 001F73; suivant : 001F75Influence of conjugation length on ultrafast electronic tunneling in organic semiconductor thin films.
Auteurs : Vincent V. Duong [États-Unis] ; Alexander L. AyznerSource :
- Physical chemistry chemical physics : PCCP [ 1463-9084 ] ; 2018.
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.
DOI: 10.1039/c8cp04746d
PubMed: 30250947
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Duong</name><affiliation wicri:level="1"><nlm:affiliation>Department of Chemistry, University of California, Santa Cruz, California 95064, USA. aayzner@ucsc.edu.</nlm:affiliation><country xml:lang="fr">États-Unis</country><wicri:regionArea>Department of Chemistry, University of California, Santa Cruz, California 95064</wicri:regionArea><wicri:noRegion>California 95064</wicri:noRegion></affiliation></author><author><name sortKey="Ayzner, Alexander L" sort="Ayzner, Alexander L" uniqKey="Ayzner A" first="Alexander L" last="Ayzner">Alexander L. Ayzner</name></author></analytic><series><title level="j">Physical chemistry chemical physics : PCCP</title><idno type="eISSN">1463-9084</idno><imprint><date when="2018" type="published">2018</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">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.</div></front></TEI><pubmed><MedlineCitation Status="PubMed-not-MEDLINE" Owner="NLM"><PMID Version="1">30250947</PMID><DateCompleted><Year>2018</Year><Month>10</Month><Day>03</Day></DateCompleted><DateRevised><Year>2018</Year><Month>10</Month><Day>04</Day></DateRevised><Article PubModel="Print"><Journal><ISSN IssnType="Electronic">1463-9084</ISSN><JournalIssue CitedMedium="Internet"><Volume>20</Volume><Issue>38</Issue><PubDate><Year>2018</Year><Month>Oct</Month><Day>03</Day></PubDate></JournalIssue><Title>Physical chemistry chemical physics : PCCP</Title><ISOAbbreviation>Phys Chem Chem Phys</ISOAbbreviation></Journal><ArticleTitle>Influence of conjugation length on ultrafast electronic tunneling in organic semiconductor thin films.</ArticleTitle><Pagination><MedlinePgn>25085-25095</MedlinePgn></Pagination><ELocationID EIdType="doi" ValidYN="Y">10.1039/c8cp04746d</ELocationID><Abstract><AbstractText>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. 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Ayzner</name></noCountry><country name="États-Unis"><noRegion><name sortKey="Duong, Vincent V" sort="Duong, Vincent V" uniqKey="Duong V" first="Vincent V" last="Duong">Vincent V. Duong</name></noRegion></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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