| Since the first report of the organic polymer-based photorefractive (PR) materials in 1991, PR polymers have been investigated intensively for their potential applications in optical information memory and processing. PR polymer composites gained more and more attention for its advantage of large PR effect, structural flexibility, and good process ability. The developing of photorefractive polymer had achieved great progress, more and more new organic photorefractive polymer systems have emerged. Some polymers'photorefractive effects have exceeded the non-polymers'.Up till now the photosensitize, electric charge transport and electro-optics molecule have been known very clearly, however, one problem have received more and more attention: the systematic research of trap state, polarization and relaxation process has not done yet. Moreover, the trap mechanism and microcosmic process have not been clearly understood, and characterization methods not perfected, which is restricting the deeper research and application of photo-refraction polymer.In this paper, we adulterated C 60and TNF in PVK, and by changing the concentration of photosensitive: C 60and TNF, material's environment temperature, exterior electric field and incidence light intensity, we have studied the photoconductive of materials, find out that the material's photoconductive is direct proportion to temperature, and augment by the increase of photosensitive concentration , exterior electric field and incidence light intensity. Furthermore, we have measured the external photocurrent efficiency of PVK+ C 60and PVK+TNF, find out PVK+TNF external photo-current efficiency is higher than PVK+ C 60, by experiment we have a deeper understand of charge carrier's...
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