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Abstract

According to the established resolution model and modulation transfer function (MTF) of varying doping and varing composition reflection-mode (r-mode) Al _xGa _1–xAs/GaAs photocathode, the resolutions of four types of r-mode photocathodes, i.e. linearly varying doping and linearly varying Al composition, uniform doping and linearly varying Al composition, linearly varying doping and uniform Al composition, uniform doping and uniform Al composition structures, are simulated, and the effects of Al composition, the types of doping, Al _xGa _1–xAs layer thickness, GaAs layer thickness, and incident light wavelength on the resolution of cathodes are analyzed. The simulation results indicate that the varying doping and varying band-gap structures can also upgrade the resolution for r-mode Al _xGa _1–xAs/GaAs photocathodes, and the effect of linearly varying doping and linearly varying composition structure are more pronounced. The simulation results also show that the MTFs of the cathodes with the Al composition varying from 0.45 to 0 linearly declining are highest. The MTFs of the cathodes with the linearly varying doping from 10 ¹⁹−10 ¹⁸cm ^–3are higher than that with uniform 10 ¹⁹cm ^–3doping. With the increase of Al _xGa _1–xAs thickness, GaAs thickness and incident light wavelength, the MTFs of four types photocathode have different regularities.

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Authors and contacts

Corresponding author:Zou Ji-Jun,jjzou@ecut.edu.cn

Funds:Project supported by the National Natural Science Foundation of China (Grant Nos. 61961001, 11875012, 62061001, 61771245), the Natural Science Foundation of Jiangxi Province, China (Grant Nos. 20181BAB202026, 20192ACBL20003, 20202BAB202013, 20203BBE53030), and the Jiangxi “Double Thousand Plan”, China (Grant No. jxsq2019201053)

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References

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阴极结构	Al组分	掺杂浓度/cm^–3
均匀掺杂均匀组分	0	保持10¹⁹不变
均匀掺杂线性组分	从0.45—0线性变化	保持10¹⁹不变
线性掺杂均匀组分	0	从10¹⁹—10¹⁸线性变化
线性掺杂线性组分	从0.45—0线性变化	从10¹⁹—10¹⁸线性变化

DownLoad: CSV

阴极结构类型	E/(V·cm^–1)
均匀掺杂均匀组分	0
均匀掺杂线性组分	2099
线性掺杂均匀组分	600
线性掺杂线性组分	2106

DownLoad: CSV

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Vol. 71, Issue 15 - 2022-08-05

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