Journal
NATURE CHEMISTRY
Volume 7, Issue 3, Pages 209-214Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NCHEM.2160
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Funding
- National Science Foundation [DMR-1206202]
- Howard Hughes Medical Institute
- American Australian Association
- Dow Chemical Company
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1206202] Funding Source: National Science Foundation
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To develop advanced materials for electronic devices, it is of utmost importance to design organic building blocks with tunable functionality and to study their properties at the molecular level. For organic electronic and photovoltaic applications, the ability to vary the nature of charge carriers and so create either electron donors or acceptors is critical. Here we demonstrate that charge carriers in single-molecule junctions can be tuned within a family of molecules that contain electron-deficient thiophene-1,1-dioxide (TDO) building blocks. Oligomers of TDO were designed to increase electron affinity and maintain delocalized frontier orbitals while significantly decreasing the transport gap. Through thermopower measurements we show that the dominant charge carriers change from holes to electrons as the number of TDO units is increased. This results in a unique system in which the charge carrier depends on the backbone length, and provides a new means to tune p- and n-type transport in organic materials.
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