Quantum efficiency decay mechanism of NEA GaN photocathode: A first principles r

Using the first-principles method based on the density functional theory (DFT), the work function of seven different GaN (0001) (1 x 1) surface models is calculated. The calculation results show that the optimal ratio of Cs to O for activation is between 3:1 and 4:1. Then, Cs/O activation and stabil