Figures from "Controlled formation of organic layers on semiconductor surfaces", by J.S. Hovis, S. Lee, H. Liu, and R.J. Hamers, Journal of Vacuum and Science Technology B, vol. 15, no. 4, pp. 1153-1158 (Jul/Aug 1997)

© 1997 American Vacuum Society

Note: All the figures shown here have been published and copyrighted. If you use or reproduce any of these figures in any way, you must indicate the original source of the image. For electronic or paper publication, you must receive written permission from Robert Hamers and the American Vacuum Society.

Figure 1

Schematic illustration of molecules discussed in the text.

(1a) Interaction of cyclopentene with the Si(100) surface.
(1b) 3-pyrroline.
(1c) Norbornadiene

Figure 2

Schematic illustration of the two polarization directions used in FTIR experiments.

Figure 3

STM image of Si(100) surface after exposure to 30L of cyclopentene at room temperature, bias -3V, tunneling current 0.2-0.3 nA.

(3a) Image showing ordered molecular adsorption on a single terrace.
(3b) High resolution image showing the translational ordering and consistent elongated appearance of individual molecules.
(3c) Image obtained on a 4o-miscut vicinal Si(100) substrate showing that molecular orientation of cyclopentene is preserved across double-height steps. Arrows indicate the positions of the double-height steps.

Figure 4

Si-H and C-H spectral regions showing the anisotropy of infrared absorption of Si(100) after exposure to 30L at room temperature of cyclopentene for both polarizations of s-polarized light.

Figure 5

C 1s XPS sprectra from a Si(100) surface, which was exposed to 30L of cyclopentene at room temperature.

Figure 6

STM image of Si(100) surface after exposure to 30L of 3-pyrroline at room temperature, bias -3V, tunneling current 0.2 nA.

Figure 7

(7a) N 1s XPS sprectra from a Si(100) surface that was exposed to 1L of 3-pyrroline at room temperature and then subsequently annealed to successively higher temperatures for 1 min.
(7b) Schematic illustration of the two different bonding possibilities for 3-pyrroline.

Figure 8

FTIR spectra of polarization direction "A" of Si(100) after exposure to 8L of 3-pyrroline at room temperature.

Figure 9

FTIR spectra using both polarization directions of s light of (100) after exposure to 10L of norbornadiene at room temperature.

Figure 10

(10a) STM image of Si(100) surface after exposure to 30L norbornadiene at room temperature, bias -3.6V, tunneling current 0.3 nA.
(10b) Schematic illustration of several bonding sites for norbornadiene on Si(100).

Last updated February 4, 1998