【摘要】 对国外标准三代、高性能三代、超三代和四代GaAs光电阴极进行了光谱响应曲线比较。结果显示,GaAs光电阴极的积分灵敏度、响应的截止波长、峰值响应和峰值位置存在明显差异。曲线拟合结果表明国外GaAs光电阴极的后界面复合速率较低,表面逸出几率和电子扩散长度从标准三代到四代不断提高,这些性能的改善导致了GaAs光电阴极灵敏度的提高。更多还原

【Abstract】 The spectral response curves of foreign standard Gen III, high performance Gen III, super Gen III and Gen IV GaAs photocathodes had been compared.There are obvious differences of integral sensitivity, response cut-off wavelength, peak response value and peak position among these photocathodes. The curve simulation results showed that foreign GaAs photocathodes have low interface recombination velocity, and surface escape probability and electron diffusion length have been improving from standard Gen III to Gen IV, which led to increase of sensitivity the GaAs photocathodes.更多还原