Preliminary Systematic Study of the Temperature Effect on the K–Cs–Sb Photocathode Performance Based on the K and Cs Co-Evaporation**Supported by the National Natural Science Foundation of China under Grant No. 11405251, and the Shanghai Municipal Science and Technology Major Project.

Abstract

It is very important to increase the quantum efficiency (QE) and prolong the lifetime of the photocathode in a variety of applications. We have succeeded in preparing a high QE cesium potassium antimonide (K–Cs–Sb) photocathode by K and Cs co-evaporation in the photocathode preparation facility. In order to better understand the effect of the substrate (photocathode) temperature on the photocathode performance, the photocathode preparation, photocathode performance degradation, photocathode performance recovery and photocathode removal are studied in detail.