Hao Guanghui, Yang Mingzhu, Chang Benkang, Chen Xinlong, Zhang Junju, Fu Xiaoqian
Institute of Electronic Engineering and Optoelectronic Technology, Nanjing University of Science and Technology, Nanjing, Jiangsu, China.
Appl Opt. 2013 Aug 10;52(23):5671-5. doi: 10.1364/AO.52.005671.
To research the attenuation performance of the AlGaN photocathode, three samples with the same structures grown by metalorganic chemical vapor deposition were activated with three different activation methods, which are called Cs-only, Cs-O, and Cs-O-Cs activation, respectively. The spectral responses and attenuated photocurrents of the three AlGaN photocathodes were measured. The results show that the Cs-O activated AlGaN photocathode exhibits the lowest attenuation speed in the first few hours, and the attenuation speed of the Cs-only activated one is fastest. After attenuating for 90 min, the attenuation photocurrent curve of the Cs-O-Cs activated sample is coincident with that of the Cs-O activated one. The main factor affecting the photocurrent attenuation is related to Cs atoms desorbed from the photocathode surface.
为研究AlGaN光电阴极的衰减性能，采用金属有机化学气相沉积法生长了具有相同结构的三个样品，并分别采用三种不同的激活方法进行激活，分别称为仅铯激活、铯-氧激活和铯-氧-铯激活。测量了三种AlGaN光电阴极的光谱响应和衰减光电流。结果表明，铯-氧激活的AlGaN光电阴极在最初几个小时内衰减速度最低，仅铯激活的光电阴极衰减速度最快。衰减90分钟后，铯-氧-铯激活样品的衰减光电流曲线与铯-氧激活样品的曲线重合。影响光电流衰减的主要因素与从光电阴极表面解吸的铯原子有关。
