Si H Image Pickup Tubes

Image pickup tubes are operated at an applied voltage high enough to draw out the saturated level of the photocurrent as shown in Fig. 7. In this region, the photocurrent is determined by the number of electron-hole 

The resolution pattern taken from a sputtered a-Si H target pickup tube is shown in Fig. 10. The horizontal resolution is not affected by boron doping and is more than 600 television lines for a tube 18 mm in diameter. This value is the same as for chalcogenide pickup tubes, which are used in the broadcasting industry (Maruyama et al., 1974). 

The decay lag for an undoped a-Si H target with scanning area of 8.8 X 6.6 mm is about 10%, at 50 msec after turning off the light of a 0.2-nA signal intensity. On the other hand, the decay lag is drastically reduced to less than 4% by a light doping with boron. This value is satisfactory for industrial or 

The properties of an a-Si H image pickup tube with a blocking structure are summarized here  

These properties indicate that a-Si H image pickup tubes are quite useful over a wide area of applications. The TV camera for an x-ray image intensifier system is an example of such an application (Iamura et al., 1982 Ishikawa et al., 1982). 

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This section focuses on a-Si H image pickup tubes and presents a-Si H property requirements and fabrication and impurity doping techniques, as well as the structure of photoconductive targets. Pickup tube characteristics that have been attained and some of their applications will be described. 

G.A. Swartz, Closed-Form Solution of I-V Characteristic for a-Si H Solar Cells Isamu Shimizu, Electrophotography Sachio Ishioka, Image Pickup Tubes... 

Typical deposition parameters for image pickup tube a-Si H are listed in Table I. 

These results suggest that a-Si H of dihydride configuration provides the better characteristics as a photoconductor for the image pickup tube. The result that the dihydride configuration a-Si H has a large °p is consistent with previous theoretical calculations (Allan and Joannopoulos, 1980). It is interesting that this situation seems to be quite different from results reported for an a-Si H solar cell, where a monohydride configuration is believed to be favorable. 

Although a-Si H has been proved to be a very good photoconductor for image pickup tubes, some problems remain to be solved. As has already been mentioned, the decay lag in a-Si H tubes is presently 4%, and it is necessary to reduce this lag, especially in order to apply the technology to broadcasting use. The decay lag as determined by the capacitance of the... 

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