Comparison of blue-green response between transmission-mode GaAsP-and GaAs-based photocathodes grown by molecular beam epitaxy

doi:10.1088/1674-1056/25/4/048505

Abstract In order to develop the photodetector for effective blue-green response, the 18-mm-diameter vacuum image tube combined with the transmission-mode Al_0.7Ga_0.3As_0.9P_0.1/GaAs_0.9P_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 μ-0.6 μ.

Keywords: GaAsP-based photocathodes transmission-mode quantum efficiency molecular beam epitaxy

Received: 05 November 2015
Revised: 30 December 2015
Accepted manuscript online:

PACS:	85.60.Ha	(Photomultipliers; phototubes and photocathodes)
	73.61.Ey	(III-V semiconductors)
	79.60.-i	(Photoemission and photoelectron spectra)
	73.40.Kp	(III-V semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 61301023) and the Science and Technology on Low-Light-Level Night Vision Laboratory Foundation, China (Grant No. BJ2014001).

Corresponding Authors: Gang-Cheng Jiao
E-mail: jiaogc613@163.com

Cite this article:

Gang-Cheng Jiao(焦岗成), Zheng-Tang Liu(刘正堂), Hui Guo(郭晖), Yi-Jun Zhang(张益军) Comparison of blue-green response between transmission-mode GaAsP-and GaAs-based photocathodes grown by molecular beam epitaxy 2016 Chin. Phys. B 25 048505

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Comparison of blue-green response between transmission-mode GaAsP-and GaAs-based photocathodes grown by molecular beam epitaxy

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