| 摘要 |
A multi-layer organic, top-surface, semiconducting dielectric overcoat, having a selected time constant permits electric field charge and dissipation at a selected rate to facilitate particulate material movement over an underlying electrode grid. The coating may be made from a first layer including an oxidant, and a second layer thereover which omits said oxidant. Each layer may further include a compound including a polymer such as bisphenol A polycarbonate, and a charge transport molecule such as m-TBD. A planarized, wear resistant, chemically stable surface, with minimized inter-electrode build-up are also provided by the overcoat.
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