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Photoemission performance of thin graded structure AlGaN photocathode

机译：薄梯度结构AlGaN光电阴极的光电发射性能

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In order to research a high-efficiency AlGaN photocathode, the AlGaN photocathodes with varied Al composition (0.68 and 0.4) and uniform Al composition (0.24) were grown. The photocathodes were activated by Cs adsorption and received their spectral response via multi-information system. Results show that the absorption rate of the AlGaN photocathode with varied Al composition is half of the AlGaN photocathode with uniform Al composition, but the quantum efficiency of the photocathode with varied Al composition is approximately 29% higher than that of the photocathode with uniform Al composition. The built-in field within the emission layer of the AlGaN photocathode with varied Al composition is much higher than that of the photocathode with uniform Al composition, which is the main factor that promotes the photoelectron movement toward the photocathode surface and improves photoemission performance of the AlGaN photocathode. (C) 2015 Optical Society of America
机译：为了研究高效的AlGaN光电阴极，生长了具有不同Al组成（0.68和0.4）和均匀Al组成（0.24）的AlGaN光电阴极。光电阴极通过Cs吸附激活，并通过多信息系统接收其光谱响应。结果表明，Al组成不同的AlGaN光电阴极的吸收率是Al组成均匀的AlGaN光电阴极的一半，但是Al组成不同的光电阴极的量子效率比Al组成相同的光电阴极的量子效率高约29％。 。 Al组成不同的AlGaN光电阴极的发射层内建的电场远高于Al组成均匀的光电阴极，这是促进光电子向光电阴极表面移动并改善其光电发射性能的主要因素。 AlGaN光电阴极。 （C）2015年美国眼镜学会

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