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Binding of styrene on silicon (111)-7 × 7 surfaces as a model molecular electronics system
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Image of FIG. 1.
FIG. 1.

(Color online) Schematic representation and optimized model structure of the [4 + 2] cycloaddition [(a) and (c)] and [2 + 2] cycloaddition [(b) and (d)] binding modes of styrene on Si (111)-7 × 7.

Image of FIG. 2.
FIG. 2.

(Color online) UPS spectra of bare silicon surfaces prepared by etch and anneal and direct flash and anneal (a). Features S1 and S2 represent the adatom and rest-atom dangling bond states respectively, indicating the presence of the 7 × 7 reconstruction. STM surface produced by flash anneal (b).

Image of FIG. 3.
FIG. 3.

(Color online) Experimental STM images showing the Si (111)-7 × 7 surface after exposure to 0.1L of styrene at room temperature. Example molecular features are circled. The images were acquired with a tunneling current of 50 pA and sample biases of −2.0 V (a) and +2.0 V (b). Scans are 16 × 16 nm2.

Image of FIG. 4.
FIG. 4.

(Color online) Simulated STM images of the [4 + 2] binding mode [(a) and (c)] and the [2 + 2] binding mode [(b) and (d)] at biases of +0.3 V (empty states) and −0.5 V (filled states). The simulations were done with a tunneling current of 30 pA. Images are plan view; the oval shows the location of the styrene molecule and the other two features represent silicon adatoms. The scale bar is 8.1 Å.

Image of FIG. 5.
FIG. 5.

On-specular [(a) and (c)] and off-specular [(b) and (d)] HREELS of 0.5 L styrene exposed to Si(111) 7 × 7 at 300 K [(a) and (b)] and 105 K [(c) and (d)].

Image of FIG. 6.
FIG. 6.

C 1s region XPS spectrum of 120 L styrene dosed on Si(111)-7 × 7 at room temperature.

Image of FIG. 7.
FIG. 7.

UPS valence band region of Si (111)-7 × 7 dosed with 200 L styrene at room temperature, compared with a clean Si surface.


Generic image for table

Comparison of apparent height of styrene features in Å.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Binding of styrene on silicon (111)-7 × 7 surfaces as a model molecular electronics system