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KMID : 1001220060080010051
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Journal of the Korean Society of Digital Medical Imaging Technology
2006 Volume.8 No. 1 p.51 ~ p.56
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Transport parameters in a-Se:As films for digital X-ray conversion material
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Park Chang-Hee
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Abstract
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The effects of Asaddition in amorphous selenium(a-Se) films for digital X-ray conversion material have been studied using the moving photocarrier grating(MPG) technique. This method utilizes the moving interference pattern generated by the superposition of the two frequency shifted laser beams for the illumination of the sample. This moving intensity grating induces a short circuit current, in a-Se:As film. The transport parameters of the sample are extracted from the grating-velocity dependent short circuit current induced in the sample alongthe modulation direction. The electron and hole mobility, and recombination lifetime of a-Se films with arsenic(As) additions have been obtained. We have found an increase in hole drift mobility and recombination lifetime, especially when 0.3% As is added into a-Se film, whereas electron mobility decreases with As addition due to the defect density. The transport properties for As doped a-Se films obtained by using MPG technique have been compared with X-ray sensitivity for a-Se:As device. The fabricated a-Se(0.3% As) device film exhibited the highest X-ray sensitivity out of 5 samples.
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KEYWORD
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a-Se:As, moving photocarrier grating(MPG), X-ray conversion material, carrier mobility, recombination lifetime, X-ray sensitivity
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