摘要本文在理论学习的基础上，利用负电子亲和势光电阴极制备系统，做了两组分析实验。 实验一：相同的激活方式（Co-deposition 激活法）而进 O 的时间不同，比较了其光电流， 光谱响应曲线及稳定性。实验二：相同的 Cs/O 比，而激活方式不同（Nagoya 激活法， Co-deposition 激活法以及一种新型激活法） ，比较比较了其光电流，光谱响应曲线及稳定 性。由实验一得出：在 Co-deposition 激活法中，交替周期越短，交替次数就越多。但并非 交替周期越短，交替次数越多激活后的阴极性能就越好。我们认为存在一个中间极值，由 于时间有限及实验条件也有限，本文并未给出这个极值，这个还有待后续的进一步研究分 析。由实验二得出：新型激活法的激活效果最好。它的工艺流程比较简单，可控性强，有 利于自动激活的实现。73290

毕业论文关键词 激活 GaAs 光电阴极 光谱响应 稳定性 Nagoya 激活法 Co-deposition 激活 法

毕 业 设 计 说 明 书 外 文 摘 要

Title Study on the  cesium oxygen  activation  process  for  improving  the stability of GaAs photo cathode

AbstractOn the basis of theoretical study, the two sets of analytical experiments are made by using the NEA photoelectric cathode preparation system。 Experiment one: the same activation mode (Co-deposition activation) and enter the O time is different, compared to the photo  current, spectral response curve and stability。 Experiment two: the same Cs/O ratio, and different activation methods (Nagoya activation, Co-deposition activation and a new type of activation), compared to the photo current, spectral response curve and stability。 From the experiment one: in the Co-deposition activation, the shorter alternate cycle, the more alternate times。 But not alternating cycle is short, alternate times is  more, after the activation of the cathode  performance is better。 I think there is an intermediate value, due to time constraints and limited experimental condition, this paper has not given the intermediate value, which is to be further studied。 From the experiment one: the activation effect of new activation method is best。 Its technological process is simple, controllability is strong,it is conducive to the realization of automatic activation。

Keywords Activation GaAs photocathode Spectral response stability Nagoya activation Co-deposition activation

目录

1 绪论 1

1。1 GaAs 光电阴极发展概况 1

1。2 GaAs 光电阴极表面模型 4

1。3 本文的研究意义和主要工作 5

2 负电子亲和势光电阴极制备和评估系统 6

2。1 超高真空激活系统 6

2。2 多信息量在线监控系统 8

2。3 激活软件介绍