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Direct Evidence of Drift-Assisted Carrier Transportation in a Gradient-Doped GaAs Photocathode

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Abstract

We report a comparative study of free-electron dynamics in uniform-doped and gradient- doped GaAs photocathodes using femtosecond pump-probe transient reflectometry. The result shows better photoelectron accumulation in gradient-doped device, evidently due to drift-assisted carrier transportation.

© 2020 The Author(s)

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