Abstract
Publisher Summary This chapter discusses avalanche-mode amorphous selenium photoconductive target for camera tube. The chapter presents the characteristics of the experimental 18 mm tubes for standard television systems. It is well known that there are two types of photoconductive target layers: the injection type and the blocking type. In the case of injection target layers, quantum efficiency as great as unity or more can be achieved, but it has the disadvantages of time lag and high dark current. In spite of its blocking-type target, the camera tube shows high sensitivity quantum efficiency greatly in excess of unity, the upper limit of the sensitivity of a conventional blocking target layer. The phenomenon of avalanche multiplication in an amorphous selenium layer was found for the first time at an applied field of greater than 0.8 × lo 8 V m –1 . This phenomenon was exploited in the target layer of an experimental camera tube.
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