Figur« 13.19. Current-voltage characteristics of the electronic switch shown in Fig. 13.18. [Adapted from J. Chen, Science 286,1550 (1999).]

To fabricate this switch, an aluminum electrode was made by lithographically patterning 0.6-pm-diameter aluminum wires on a silica substrate. This electrode was then exposed to oxygen to allow a layer of AI2O3 to form on it. Next a single monolayer of the roxatane molecule, such as the one shown in Fig. 13.20, was deposited as a Langmuir-Blodgett film, which was discussed in Chapter 10. Then a 5-pm layer of titanium followed by a thicker layer of aluminum were evaporated through a contact mask using electron beam deposition.

Figure 13.22 shows the current-voltage characteristics of this device. The application of —2 Y the read mode, caused a sharp increase in current. The switch could be

Flgure 13.20. Roxatane molecule used in a switch illustrated in Fig. 13.21 to make molecule-based logic gates. [Adapted from C. P. Collier et al., Science 285, 391 (1999).]

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