Comparison of blue–green response between transmission-mode GaAsP- and GaAs-based photocathodes grown by molecular beam epitaxy*
Comparison of blue–green response between transmission-mode GaAsP- and GaAs-based photocathodes grown by molecular beam epitaxy*
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通过分子束外延生长的透射模式 GaAsP 和 GaAs 光电阴极之间的蓝绿响应比较*
DOI：
10.1088/1674-1056/25/4/048505
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发表时间：
2016
影响因子：
1.7
通讯作者：
Yijun Zhang
中科院分区：
文献类型：
--
作者：
Gang;Zheng;Hui Guo;Yijun Zhang
为了开发有效的蓝绿响应光电探测器，试制了18毫米直径的真空像管与分子束外延生长的透射模式Al0.7Ga0.3As0.9 P 0.1/GaAs0.9 P 0.1光电阴极相结合。透射型GaAsP基光电阴极和蓝光扩展GaAs基光电阴极的光电特性、光谱特性和性能参数的比较表明，GaAsP基光电阴极在蓝绿光波段具有更好的吸收和更高的量子效率，以及更大的表面电子逃逸概率。特别是，GaAsP基光电阴极在532 nm处的量子效率高达59%，几乎是蓝光扩展GaAs基光电阴极的两倍，更有利于基于激光照明的水下距离选通成像。此外，模拟结果表明，通过将发射层厚度优化在0.4μm-0.6μm范围内，可以获得良好的蓝绿响应。
In order to develop the photodetector for effective blue–green response, the 18-mm-diameter vacuum image tube combined with the transmission-mode Al0.7Ga0.3As0.9 P 0.1/GaAs0.9 P 0.1 photocathode grown by molecular beam epitaxy is tentatively fabricated. A comparison of photoelectric property, spectral characteristic and performance parameter between the transmission-mode GaAsP-based and blue-extended GaAs-based photocathodes shows that the GaAsP-based photocathode possesses better absorption and higher quantum efficiency in the blue–green waveband, combined with a larger surface electron escape probability. Especially, the quantum efficiency at 532 nm for the GaAsP-based photocathode achieves as high as 59%, nearly twice that for the blue-extended GaAs-based one, which would be more conducive to the underwater range-gated imaging based on laser illumination. Moreover, the simulation results show that the favorable blue–green response can be achieved by optimizing the emission-layer thickness in a range of 0.4 μm–0.6 μm.
影响因子：
4
作者：
X. Jin;B. Ozdol;M. Yamamoto;A. Mano;N. Yamamoto;Y. Takeda
通讯作者：
X. Jin;B. Ozdol;M. Yamamoto;A. Mano;N. Yamamoto;Y. Takeda