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(Color online) The schematics of energy profile (a) without and (b) with the extension of molecular junctions in contacts. The circles label the contact conformation changes. is the width of contact barrier without extensions of molecular junctions, and is the length of the molecule. and are decay constants of the molecule and contact, respectively.
(Color online) (a) A typical conductance trace under the mechanical modulations. The highlighted curves by the rectangular box show the conductance changes under the extensions; (b) Four representative curves show the conductance changes with extension distance; and (c) The contact decay constant changes under extension distance obtained from the curves in (b).
(Color online) (a) Histograms of contact decay constant in C8DT junction without extensions (from around 200 curves); (b) Contact decay constant changes and contact barrier height with extension distance . The curve in (a) is the Gaussian fitting of the statistical histogram and the value of each point in (b) Gaussian fitting center of histogram at certain stretching distance obtained by the similar statistical methods. The standard deviations, the full widths at half-maximum (fwhm) histogram peak from the Gaussian fitting are marked as the error bars in (b).
(Color online) (a) Representative conductance-extension curves of C8DA and (b) contact decay constant changes and height changes of contact potential barrier in C8DA molecular junctions with extension distance .
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