Influence of Exposure to CO, CO2 and H2O on the Stability of GaAs Photocathodes
Influence of Exposure to CO, CO2 and H2O on the Stability of GaAs Photocathodes
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DOI：
10.1143/jjap.29.2087
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发表时间：
1990-10
影响因子：
1.5
通讯作者：
T. Wada;Toshiyuki Nitta;T. Nomura;M. Miyao;M. Hagino
中科院分区：
文献类型：
--
作者：
T. Wada;Toshiyuki Nitta;T. Nomura;M. Miyao;M. Hagino
本文研究了CO、CO2和H2O气体对负电子亲和型GaAs光电阴极工作稳定性的影响。我们发现暴露在H2O和CO2中都会降低光电阴极的光电流。然而，暴露于CO这种对各种光电阴极有害的气体中，对光电阴极的稳定性影响很小。此外，还研究了这些气体对附加铯沉积恢复光电流的影响。这些结果讨论了在NEA GaAs光电阴极中起重要作用的Cs/O活化层。
The influence of CO, CO2 and H2O gases on the stability of negative-electron-affinity (NEA) GaAs photocathodes during operation is investigated in the present work. We have found that exposure both to H2O and CO2 decreases the photocurrent of the photocathode. However, exposure to CO, which is known as a harmful gas to various photocathodes, has little effect on the photocathode stability. Furthermore, the effects of these gases on the restoration of the photocurrent by additional cesium deposition are investigated. These results are discussed with regard to the Cs/O activation layer which plays an important role in NEA GaAs photocathodes.