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A dual-layered photoreceptor device made from a χ-form metal-free phthalocyanine (χ-H 2 Pc) was prepared. The effects of impurity sulfur and its chemical valence state in the χ-H 2 Pc on the properties of electrophotography have been studied. One of the interesting phenomena observed is the role of impurity of sulfur in χ-H 2 Pc is promoting the performance of photoreceptor...
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