| Citation: |
Zou Jijun, Yang Zhi, Qiao Jianliang, Chang Benkang, Zeng Yiping. Effect of Surface Potential Barrier on the Electron Energy Distribution of NEA Photocathodes[J]. Journal of Semiconductors, 2008, 29(8): 1479-1483.
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Zou J J, Yang Z, Qiao J L, Chang B K, Zeng Y P. Effect of Surface Potential Barrier on the Electron Energy Distribution of NEA Photocathodes[J]. J. Semicond., 2008, 29(8): 1479.
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Effect of Surface Potential Barrier on the Electron Energy Distribution of NEA Photocathodes
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Abstract
By calculating the energy distribution of electrons reaching the photocathode surface and solving the Schrdinger equation that describes the behavior of an electron tunneling through the surface potential barrier,we obtain an equation to calculate the emitted electron energy distribution of transmission-mode NEA GaAs photocathodes.According to the equation,we study the effect of cathode surface potential barrier on the electron energy distribution and find a significant effect of the barrier-I thickness or end height,especially the thickness,on the quantum efficiency of the cathode.Barrier II has an effect on the electron energy spread,and an increase in the vacuum level will lead to a narrower electron energy spread while sacrificing a certain amount of cathode quantum efficiency.The equation is also used to fit the measured electron energy distribution curve of the transmission-mode cathode and the parameters of the surface barrier are obtained from the fitting.The theoretical curve is in good agreement with the experimental curve. -
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