Study Of Phthalocyanine Typed Photoconductivity

Phthalocyanine compounds have attracted a great deal of attention for a long time because of their unique properties such as semi conductivity, photoconductivity and chemical activity. They became one kind of very interesting organic photoconductive materials for the advantages of being very cheap, low-poisonous, very stable against thermal and chemical de-composition, and present very intense optical absorptions in the visible. They show considerable promise for applications such as xerography, laser printing, organic solar cells, and so on.Compared with Langmuir-Blodgett, self assembled membranes (SAMs), Vacuum Evaporation, and some other methods, spin-coating is the most suitable way to make photoconductive film in the case of our current test conditions. This method is very rapid and convenient. The surface planarization of films is determined by many factors, such as board, concentration of spin-coating solution, the kind of solvent, temperature, and spin speed, and so on.As far as copper phthalocyanine is concerned, either the water solubility or oil solubility is very poor, which prevents the full use of copper phthalocyanine film. In this paper, two kinds of copper phthalocyanine sulfonylamine derivatives were sythesised and made into spin-coating film. They were proved to have higher oil solubility. Perhaps because the introduction of different functional group has destroyed the symmetry of copper phthalocyanine, the electronic channel is changed, and the photoconductivity of them is not very obvious.Phthalocyanine-typed compounds have two strong absorption bands in both ultraviolet and near infrared regions associated with Soret and Q-band. The Soret-band is from 300 to 400nm, and the Q-band is from 600 to 800 nm. While Perylene anhydride has a strong absorption from 400 to 600 nm, which makes it possible to establish a full response from 300 too 800 nm only if the two kinds of photoconductive material were put together to form a new material. In Chapter Four, we did so. The photoconductivity of the compound materials is improved.At last, on the basis of function separation type double-layer photoconductivity, we added an individual ETL to make a new three-layer photoconductivity, including ETL, CGL, and HTL. In this way, minority carrier can be transferred in time, which makes the probability of electron-hole pair recombination decreased, and promotes the photoconductive properties. The electrostatic capacity became very small with the thickness of the photoconductive device increasing. This is not good for the amplification and application of such device.