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第十六章光电探测器及热探测器(续) 16.2 光电管 16.2.1 光电阴极和真空光电二极管 16.2.1 阴极材料为了获得有用的光电发射阴极,当然要求逸出功(功函数)相当低,清洁的金属表面是较差的光电发射体。然而当在银或钨这类基底上吸附有碱金属离子的单分子层时,就会获得好得多的响应,这大概是因为在金属表面上形成双电层的缘故。与这种双电层
CHAPTER 16 PHOTOVOLTAIC DETECTORS AND HEAT DETECTORS, CONTINUED 16.2 Phototubes 16.2.1 Photocathodes and Vacuum Photodiodes 16.2.1 Cathode Materials In order to obtain useful cathodes for photoemission, it is of course required that the work function (work function) be relatively low , A clean metal surface is a poor photoemissive emitter. However, when a monolayer of alkali metal ions is adsorbed on a substrate such as silver or tungsten, a much better response is obtained, presumably due to the formation of an electrical double layer on the metal surface. With this double layer