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一、引言通常在光电管、摄象管和变象管中光电阴极的制备方法都是靠在管内蒸锑,并且用碱金属蒸汽激活,以得到所需要的灵敏度。这些光电器件内部有大量的电极存在,有些电极与光阴极非常靠近。为了得到均匀的光阴极,蒸锑支管或固定锑源的位置就有一定的要求。但是此要求往往与电子光学设计的电极位置相矛盾。这是曾长期存在的、较难克服的矛盾。在管内制作光阴极时,因碱金属蒸汽在激活锑层的同时也与电极表面起作用,使电极表面功函数降低,引起漏电流、场致发射和二次发射,使器件的暗背景增大,影响图象质量。
I. INTRODUCTION The preparation of photocathodes usually in phototubes, video tubes and video tubes is based on the vaporization of antimony in tubes and activation with alkali metal vapor to obtain the required sensitivity. These optoelectronic devices have a large number of electrodes inside, some very close to the photocathode. In order to get a uniform photocathode, steamer or fixed antimony Sb source of the location there are certain requirements. However, this requirement often contradicts the electrode design of electro-optical designs. This is a long-standing and difficult to overcome contradiction. When making photocathode in the tube, alkali metal vapor acts on the surface of the electrode while activating the antimony layer to reduce the work function of the surface of the electrode, causing leakage current, field emission and secondary emission, thereby increasing the dark background of the device , Affect the image quality.