Photosensitive layers

Diethanolamine salts with fluoroalkanol phosphates are used for presensitized lithographic printing plates. The plate has a partially exposed photosensitive layer containing a polyurethane resin having acidic H-containing substituent and... 

The recording of sequential photon pulses for measurements of low levels of electromagnetic radiation as well as the recording of emission decays. The pulses are recorded from electron emission events from some photosensitive layer in conjunction with a photomultiplier system. See also Time-Correlated Single Photon Counting Fluorescence... 

As already shown, the sensitized spectra follow the dye absorption. Most of the dyes have sufficiently narrow absorption bands. This does not permit us to obtain the panchromatic sensitivity in the sufficiently broad spectral range. It was proposed to use the polymers with conjugated bonds as sensitizers [21]. The broad diffuse absorption spectra are inherent to such compounds. One can expect higher thermal stability from such sensitizers. In addition the application of binder may be omitted from the preparation of the photosensitive layers, for example, in electrophotography. Polymers with triple bonds, polyphenylenes and polyoxiphenylenes were used as sensitizers [10, 14, 278-280]. The typical results are shown in Fig. 47. The main rules for photoconductivity sensitized by polymers were the same as for the dyes. Optimum sensitization was obtained at the concentration of the sensitizer of 10 1-10-2 g/cm3 relative to the polymeric photoconductor weight. 

An even simpler duplication process based on the same principle is shown in Figure 5.29(B). If a hole-injecting electrode is used instead of a photosensitive layer, simple electrostatic charging allows the pattern to be read and transferred.148 Other new technologies based on the photopatteming of polysilanes are being developed, and may become commercialized in the future. 

The structure of the paper itself affects the behavior with respect to Beer s law which establishes a relation between extinction E and concentration C of transparent solutions, according to the expression E = kC. When extinction measured on paper is plotted against concentration, not a linear but a hyperbolic curve is obtained (CIO, Cll). The cause of the error is the sievelike structure of the paper, since only the threads are covered with stained proteins while the meshes remain completely permeable to light (Fig. 34). This light falling directly on the photosensitive layer of the cell gives, on the microscopic scale, the same error as found for uneven distribution of stained spots on a clear... 

A high resistance photo-conductive detector structure is disclosed in US-A-4731640. An n-type photosensitive layer connected via two n+-type regions is disposed between two blocking regions which confine electrons and holes within the photosensitive layer. The increase of the resistance of the photosensitve layer is accomplished by electrically depleting majority carriers, electrons, out of the photosensitive layer. 

We found that purification of HABIs and removal of impurities from photosensitive layers did indeed speed up the chemistry Dr. R. David Mitchell, whose laboratory was adjacent to mine worked on a novel amplification system, and things seemed at long last turn into a positive direction. 

When a reactively sputtered a-Si H is used for the photosensitive layer, the voltage at which the photocurrent saturates is about 15 V for undoped a-Si H. This saturation voltage decreased to 5 V when using nitrogen-doped a-Si H due to the increased electron mobility (Shimomoto et al., 1982). 

Sodium and potassium bromide are mainly utilized in the manufacture of silver bromide for photosensitive layers. Utilization as a sedative has declined. 

Figure 3.88. Composition of a multilayer optical data storage medium photosensitive layer of about 1-p.m thickness (1), nonphotoactive polymer as separating layer of 30-pm thickness (2), and glass substrate (3) [244],...

Development of a relief image in the photosensitive layer of a photoresist. A development of a relief image in the photosensitive layer of the photoresist is the central step of a photolithography. The step suggests an implementation of physical and chemical procedures to use differences in properties of the exposed and unexposed parts of the photoresist for selective removal of only one type (i.e., either exposed or unexposed) of them and hence to produce a relief image in the photoresist. At the end of the development, the pattern from the reticle is replicated in the photoresist and a photoresist mask is formed. 

The idea being a basis for the method is simply to use a radical or ion latent image formed after selective exposure of a photosensitive layer to initiate graft-polymerization of monomers containing silicon and/or of... 

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