High-quantum-efficiency ultraviolet solar-blind AlGaN photocathode detector with a sharp spectral sensitivity threshold at 300 nm.
High-quantum-efficiency ultraviolet solar-blind AlGaN photocathode detector with a sharp spectral sensitivity threshold at 300 nm.
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DOI：
10.1364/ao.57.008060
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发表时间：
2018-09
期刊：
影响因子：
1.9
通讯作者：
Guanghua Tang;Feng Yan;Xinlong Chen;Weike Luo
中科院分区：
文献类型：
--
作者：
Guanghua Tang;Feng Yan;Xinlong Chen;Weike Luo
目前，大多数实用的紫外日盲探测器都是基于碲铯光电阴极像增强器的。然而，受光电发射特性的限制，Te-Cs光电阴极很难同时实现应用波段的高量子效率和非应用波段的高截止比。本文报道了一种基于AlGaN光电阴极的高量子效率紫外日盲探测器，该探测器在300 nm处具有灵敏度阈值。所提出的AlGaN光电阴极具有极高的量子效率（即，在210-275 nm波段，效率曲线在300 nm处急剧下降至2%，显示出明显优于现有Te-Cs光电阴极的上级性能。
At present, most of the existing practical ultraviolet (UV) solar-blind detectors are based on Te-Cs photocathode image intensifiers. However, limited by their photoemission characteristics, it is difficult for the Te-Cs-based photocathodes to achieve both high quantum efficiency in the application band and high cutoff ratio in the non-applied band simultaneously. In this paper, a high-quantum-efficiency UV solar-blind detector based on AlGaN photocathodes with a sharp spectral sensitivity threshold at 300 nm is reported. The proposed AlGaN photocathode has extremely high quantum efficiency (i.e., 20%) in the 210-275 nm band, while the efficiency curve steeply reduces to 2% at 300 nm, showing obviously superior performance than the existing Te-Cs photocathodes.