Phthalocyanines in molecular electronic devices

The application of phthalocyanine molecules in molecular electronic devices is discussed. The electrooptical properties of phthalocyanine molecules are based on rapid and controllable intramolecular charge transfer. The charge transfer causes changes in molecular polarizability, which is responsible for molecular optical response. The charge transfers can be very rapid, less than a picosecond, and require small amounts of energy, on the order of a few kT. A few examples illustrate some novel properties of phthalocyanine molecules for applications in systems that utilise a neural network concept