Single and double photoinjections prove to be a useful tool for investigations of recombination mechanisms. The photodischarge of selenium electrophotographic layers due to double and single photo-injections has been investigated. Experimental results show that every photoproduced pair of free carriers either recombines independently of the other free carriers or takes part in the photodischarge without subsequent recombination. This recombination explains energy-dependent quantum efficiency in the 2.5-eV (and greater) spectral region.
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The optical properties of an electrophotographic film comprised of closely packed submicron selenium spheres embedded in a polymer matrix were investigated. In one case the spheres were arranged in a monolayer; in a second the particles were dispersed throughout the polymer matrix. The optical transmission of these structures was measured as a function of wavelength and particle size and compared with physical models based on Mie theory.
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View Article and Find Full Text PDFFast photodischarge (10(-3)-10(-7) sec) of electrophotographic selenium layers due to strongly absorbed light pulses (10(-7) sec) has been investigated by means of differential and integral methods. The results provide valuable information on the conditions of carrier drift and trapping during discharge. Se layers are found to possess high density of hole and shallow electron traps concentrated predominately at the surface of a layer.
View Article and Find Full Text PDFSingle and double photoinjections prove to be a useful tool for investigations of recombination mechanisms. The photodischarge of selenium electrophotographic layers due to double and single photo-injections has been investigated. Experimental results show that every photoproduced pair of free carriers either recombines independently of the other free carriers or takes part in the photodischarge without subsequent recombination.
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