We report synthesis and characterization of a batch of three cesium potassium antimonide photocathodes that have been grown on pure copper substrates via a ternary co-deposition method whose procedure is described herein. A deposition system that was designed for synthesis of two-element photocathodes has been utilized for synthesis of the aforementioned three-element photocathodes with slope of the in situ photocurrent as the driver for the growth process. A variation of substrate temperature and deposition parameters among the three photocathodes during synthesis has yielded a maximum quantum efficiency of 6% for $140°\mathrm{C}$ substrate temperature. Lifetime studies performed in a 65-kV DC electron gun on two of the photocathodes, but under oxidized states, at tens of $\mathrm{\mu }$A average currents (ampere-level peak currents) extracted utilizing a 532-nm wavelength, 1-kHz repetition rate laser, have resulted in charge-lifetimes of 6.13 C and 13.78 C, respectively. X-ray photoelectron spectroscopy analysis of the photocathode with the highest quantum efficiency has revealed a nearly impurity-free surface with stoichiometry Cs_1.3K_1.8Sb_1.0 when pristine. Furthermore, it has been found that oxidation of the alkali surface atoms as well as carbon adsorption from hydrocarbons and minor fluorine uptake are the causes of quantum efficiency reduction during laser illumination in the utilized experimental set-up.

我们报告了通过三元共沉积方法在纯铜基板上生长的一批三个铯锑化锑酸钾钾光电阴极的合成和表征，其过程在本文中进行了描述。被设计用于合成二元素光电阴极的沉积系统已经被用于合成上述三元素光电阴极，其中原位光电流的斜率作为生长过程的驱动力。在合成过程中，三个光电阴极之间衬底温度和沉积参数的变化产生了最大量子效率为6％。$140°\mathrm{C}$基板温度。在65 kV直流电子枪中对两个光电阴极进行了寿命研究，但在氧化状态下，数十$\mathrm{\mu }$使用532 nm波长，1 kHz重复频率的激光器提取的平均电流（安培级峰值电流）分别导致充电寿命为6.13 C和13.78C。对具有最高量子效率的光电阴极进行X射线光电子能谱分析，发现原始时化学计量比为Cs _1.3 K _1.8 Sb _1.0的近乎无杂质的表面。此外，已经发现，在所利用的实验装置中，碱表面原子的氧化以及碳氢化合物的碳吸附和少量的氟吸收是激光照射过程中量子效率降低的原因。