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KMID : 1059519950390030176
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Journal of the Korean Chemical Society
1995 Volume.39 No. 3 p.176 ~ p.185
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The Photovoltaic Effect of Iodine-Doped Metal Free Phthalocyanine/ZnO System(Ⅱ)
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Heur Soun-Ok
Kim Young-Soon
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Abstract
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To improve photosensitizing efficiency of ZnO/H2Pc(I)x system, ZnO/H2Pc(I) x system was dispersed in a typical photoconductive polymer of poly(9-vinylcarbazole)(PVCZ). The iodine dopant level(x) of ZnO/χ-H2 Pc(I)x is proportional to concentration of iodine, whereas x of ZnO/β-H2Pc(I)x decreased from the highest x=0.97 at more than 6.3×10-3 M iodine solution. The Raman spectra of ZnO/χ-H2Pc(I)x at 514 nm exhibited characteristic I3- patterns in the range of 50∼550 cm-1 at x≥0.57. The surface photovoltage of ZnO/χ-H2Pc(I)0.48/PVCZ was approximately 1.6 times greater than ZnO/χ-H2 Pc(I)0.48 and was 1.8 times of ZnO/χ-H2Pc(I)0.57/PVCZ at 670 nm. With ZnO/H2Pc(I)x/PVCZ, the highest iodine dopant levels showed a higher photovoltage. Therefore the injection of holes from H2Pc into PVCZ resulted in that photosensitizing effect of ZnO/H2Pc(Ⅰ)x/PVCZ system was improved compared to ZnO/H2Pc(I)x case.
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