Photoinduced Displacement current across organic-monolayrs and the development of monolayr-memory devices

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The purpose of this project was to examine the electrical and optical properties of organic single monolayrs on the basis of physics of dielectrics, and then to develop organic-monolayr memory devices using photoinduced displacement current across the monolayr. Photoisomerization of monolayr films containing Azo-dye prepared on a water surface was found to be detected by means of Maxwell-displacement-currentmeasuring-technique developed by the present investigators. The desplacement current was reversely generated across single monolayrs in opposite directions by alternately irradiation of visible and ultra-violet lights. This phenomenon was applied to the development of organic-monolayr memory devices using single monolayrs prepared on solid substrates. We then fabricated tunnel junction with polyimide Langmuir-Blodgett films. The electron transport mechanism through the films was examined by means of I-V and d^2V/dI^2-V measurements. It was found that electrons tunnel scross across the films without loss of their own energy. Based on this information, we fabricated monolayr devices using polymide as a tunneling barrier, and we also fabricated monolayr devices using polyimide with functional entities.