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Single Molecules in Strong Optical Fields: A Variable-Temperature Molecular Junction Spectroscopy Setup
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DOI：10.1021/acs.analchem.1c01633.png)
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Abstract
En 中文
In order to advance the development of molecular electronic devices, it is mandatory to improve the understanding of electron transport and functionalities in single molecules, integrated in a well-defined environment. However, limited information can be obtained by solely analyzing I-V characteristics, whence multiparameter studies are required to obtain more information on such systems including chemical bonds, geometry, and intramolecular strain. Therefore, we developed an analytical method incorporating an optical near-field technique, which allows us to investigate single-molecule junctions at variable temperatures in strong optical fields. An apertureless near-field emitter acts as a counter electrode and a plasmonic waveguide to focus surface plasmon polaritons into the molecular junctions, where a strongly enhanced evanescent field is confined to only a few nanometers around the apex of the tip. The temperatures, is demonstrated by simultaneously investigating electronic and optical features of dithiol in dependence of its charge state. This multichannel method can be employed to analyze properties in single-molecule junctions such as photoconductance and photocurrent generation and molecular junctions by spectroscopic means as well.
Keywords:
TETRAHEDRAL TIP
MICROSCOPY
SIGNATURE
RECTIFICATION
CONDUCTANCE
ELECTRONICS
TRANSPORT
LENGTH
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