ABSTRACT
I. STRUCTURE AND CONFIGURATION Xerographic photoreceptors can be prepared in either a single-layer or a multilayer configuration. The most common is the dual-layer arrangement. Figure 1 illus trates a cross-section of a generic dual-layer photoreceptor. In the dual-layer configuration, the active layers are the charge generation and charge transport layers. Charge generation layers are usually prepared as dispersions of pigment particles in a polymer host or as vapor-deposited layers. Most generation layers are between 1 and 3 |xm in thickness. Charge transport layers are normally mixtures of low molecular weight donor or acceptor compounds in a polymer. Transport layers are typically 15 to 30 |xm in thickness. In the single-layer configuration, the charge generation and transport functions are combined in a single layer. Single layer photoreceptors are usually between 10 and 15 |xm in thickness. In both dualand single-layer configurations, other layers may be present. The more common of these include adhesive layers, antireflection layers, blocking layers, protective surface layers, and smoothing layers.
