Quantum efficiency study of the sensitive to blue–green light transmission-mode GaAlAs photocathode
Quantum efficiency study of the sensitive to blue–green light transmission-mode GaAlAs photocathode
复制标题
DOI：
10.1016/j.optcom.2014.08.047
复制
发表时间：
2015-01
影响因子：
2.4
通讯作者：
Xinlong Chen;Muchun Jin;Yuan Xu;Benkang Chang;F. Shi;Hongchang Cheng
中科院分区：
文献类型：
--
作者：
Xinlong Chen;Muchun Jin;Yuan Xu;Benkang Chang;F. Shi;Hongchang Cheng
研究了蓝绿透射模式GaAlAs光电阴极的量子效率。制备了两种不同结构的透射式GaAlAs光电阴极，测量了其量子效率曲线。利用量子效率公式对实验曲线进行拟合，得到了光电阴极的电子扩散长度、背界面复合速度和表面电子逃逸几率等性能参数。研究了Al组分、发光层厚度和电子扩散长度对量子效率的影响。结果表明，两种透射式GaAlAs光电阴极都对蓝绿光敏感。一个光阴极的量子效率峰值出现在565 nm附近，而另一个光阴极的量子效率峰值出现在535 nm附近。发射层的Al组分对透射式GaAlAs光电阴极量子效率的峰值位置起主要作用。此外，发光层的厚度和窗口层的Al成分也对量子效率有很大的影响。
The quantum efficiency of the blue–green transmission-mode GaAlAs photocathode has been studied. Two transmission-mode GaAlAs photocathodes with different structures are prepared, and the quantum efficiency curves are measured. We use the quantum efficiency formula to fit the experimental curves, and obtain the performance parameters of photocathodes such as the electron diffusion length, the back interface recombination velocity, and the surface electron escape probability. The effects of the Al compositions, the thickness of emission layer, and the electron diffusion length on quantum efficiency are investigated. The results show that both of transmission-mode GaAlAs photocathodes are sensitive to the blue–green light. The peak quantum efficiency of one photocathode appears at about 565 nm, while that of another photocathode appears at about 535 nm. The Al composition of emission layer plays a major role on the peak position of quantum efficiency of transmission-mode GaAlAs photocathode. Besides, the thickness of emission layer and the Al composition of window layer also have a large influence on the quantum efficiency.