A theoretical and experimental evaluation of Ⅲ-nitride solar-blind UV photocathode

We have developed a superior solar-blind ultraviolet （UV） photocathode with an AlxGa1_xrN photocathode （x ～ 0.45） in semi-transparent mode, and assessed spectra radiant sensitivity related to practical use. Betbre being grown over a basal plane sapphire substrate by low-pressure metal organic chemic...

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Published in:Chinese physics B 2017-08, Vol.26 (8), p.557-560
Main Author: 任彬 郭晖 石峰 程宏昌 刘晖 刘健 申志辉 史衍丽 刘培
Format: Article
Language:English
Subjects:
低压金属有机化学气相沉积
光电阴极
光谱辐射
实验
日盲
氮化物
紫外
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Summary:We have developed a superior solar-blind ultraviolet （UV） photocathode with an AlxGa1_xrN photocathode （x ～ 0.45） in semi-transparent mode, and assessed spectra radiant sensitivity related to practical use. Betbre being grown over a basal plane sapphire substrate by low-pressure metal organic chemical vapor deposition （MOCVD）, a reasonable design was made to the photocathode epitaxy structure, focusing on the AlxGa1_xN： Mg active layer, then followed by a comprehen- sive analysis of the structural and optical characterization. The spectra radiant sensitivity is peaked of 41.395 mA/W at wavelength 257 nm and then decreases by about 3 to 4 decades at 400 nm demonstrating the ability of this photocathode for solar-blind application prospects.
ISSN:1674-1056
2058-3834
DOI:10.1088/1674-1056/26/8/088504