GaN光电阴极测试与评估技术研究

Measurement and Evaluation of GaN Photocathodes

GaN光电阴极的制备成功与否需用科学手段加以评估。在GaAs光电阴极多信息量测试系统的基础上,增设紫外光源,并对评估软件重新加以编写,设计出GaN光电阴极测试评估系统。利用该系统测试了GaN光电阴极在制备过程中的Cs源电流、O源电流、光电流和激活室真空度等多个信息量,并利用激活后的光谱响应对阴极进行了评估,实现了对GaN光电阴极性能的客观评价。

It is necessary to evaluate GaN photocathode with scientific method.The measurement and evaluation system for GaN photocathode was designed based on multiinformation measurement system for GaAs photocathode by adding UV light source and reprogramming evaluation software.Multiple measurements such as Cs source current,O source current,photocurrent and vacuum of activation chamber of GaN photocathode in preparation were tested in the measurement and evaluation system,and the evaluations were carried out on GaN photocathodes by their activated spectral response.