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引言多碱光电阴极(Na_2KSb[Cs])由于它具有较高的光电灵敏度(～700μA/lm)和较宽的光谱响应(2000■～10000■),因此受到人们的重视,被广泛地应用于光电器件中,是目前夜视器件和单光子检测器件的基础之一。但其制备工艺较复杂,其光电发射机理至今不是很清楚。1955年,Sommer 发明这种阴极时,把光电转换的高效率原因称为“多碱效应”。二十多年来,为探讨“多碱效应”做了很多结构和特性的研究工作。
Introduction Due to its high photoelectric sensitivity (~ 700μA / lm) and wide spectral response (2000 ~ ~ 10000 ■), the multi-alkali photocathode (Na_2KSb [Cs]) has attracted people’s attention and is widely used in Optoelectronic devices, is currently one of the foundations of night vision devices and single-photon detection devices. However, the preparation process is complicated, and the mechanism of photoemission has not been very clear up to now. When Sommer invented the cathode in 1955, the reason for the high efficiency of photoelectric conversion was called “poly-alkali effect.” For more than two decades, many studies on the structure and properties of “poly-alkali effect” have been done.