Photoconductive layer

The abihty to accept and hold the electrostatic charge in the darkness. The photoconductive layer should support a surface charge density of approximately 0.5-2 x 10 C/cm. The charge also has to be uniformly distributed along the surface, otherwise nonuniformities can print out as spot defects. The appHed surface potential should be retained on the photoreceptor until the time when the latent electrostatic image is developed and transferred to paper or, if needed, to an intermediate belt or dmm. In other words, the "dark decay" or conductivity in the dark must be very low. The photoconductor materials must be insulators in the dark. 

Electrophotography. The main stages of the electrophotographic process consist of charging the photoconductive layer on the conducting plate, formation of the latent potential image under illumination, and visualization of the image. 

Styryl dyes that contain the carbazole ring system are used in the production of photoconducting layers in electrophotography [74],... 

Fig. 19 PDLC-SLM. LC liquid crystal droplet M dielectric mirror A light absorption layer BSO photoconductive layer O optical cement PW writing beam PR reading beam.

When a light pattern illuminates the front face (Fig. 8.17(b)), the light passes through the transparent electrode to interact with the photoconductive layer, raising its conductivity. Simultaneously a voltage pulse (about 200 Y) is applied across the electrodes, the major part of which, in the illuminated regions, drops across the ferroelectric. As a result the polarization is switched from the strain-biased configuration to a direction approximately normal to the plate. In this... 

The ceramic plate, ITO electrodes and photoconductive layer are arranged as in the previous example. In its unpoled state the PLZT scatters light, probably at the 71° and 109° domain boundaries associated with the rhombohedral structure. When a voltage pulse is applied simultaneously with a light pattern incident on the plate, the polarization is switched to a direction normal to the plane of the plate and the scattering is reduced. 

Fig. 1. Schematic drawing of proposed amorphous silicon cell model showing junctions at p+-i and n -i interfaces with intervening photoconductive / layer.

Fig. 2. Structure of a-Si H photoreceptor and its energy diagram indicating the blocking behaviors. (1) Photoconductive layer, (2) blocking layer, (3) conducting substrate.

In Eiectrofax. a photoconductive layer is bonded to a paper receiver. The coated paper then serves as the medium for both the formation of the latent image and... 

More recent studies on n-CdS [250, 251] and n-Ti02 photoanodes [252] implicate the formation of photoconductive layers in the APEs. Thus, the foregoing review suggests the following ... 

In 2005, Chiou et al. first introduced an optoelectronic tweezers (OET) device, which is composed of ITO plate electrodes for the application of a voltage and hydrogenated amorphous silicon (a-Si H) as a photoconductive layer deposited on the plate electrode [34]. Since the intrinsic a-Si H has... 

Figure 2. Pictures of (a) a fabricated photoconductive layer [39] and (b) a set optoelectrofluidic device on a microscope stage.

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