Physics of contact interface of electron emission devices for display

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A semiconducting diamond is a potential element of the electron emitters with high efficiency, because the diamond was reported to have negative or small positive electron affinity, which is advantageous for enhancing the emission efficiency. In order to increase the efficiency, many factors which affect the efficiency must be improved. The effects of surface morphology on the field emission properties of non-doped polycrystalline diamond films with thicknesses ranging from 5 to 55 μm were studied. Diamond films grown by a microwave plasma chemical vapor deposition technique had both the diamond and non-diamond components with pyramidal and angular crystalline structures. Although the average crystallite size increased with increasing the film thickness (d), the volume fraction of the non-diamond components in the films was insensitive to the film thickness. However, the turn-on electric field, FィイD2TィエD2, (defined as the low-end electric field to emit electrons) showed a U-shape dependence on the film thickness. This U-shape dependence was explained by a model in which the emission current was controlled by the resistance at surface of the pyramids when d was thinner than 20 μm and by the resistance in the diamond film when d was thicker than 20 μm. The lowest field of 4 V/μm was obtained in the film with 20 μm thick.