Abstract
We create a GaN photocathode based on graded AlxGa1?xN buffer layers to
overcome the influence of buffer-emission layer interface on the photoemission of
transmission-mode GaN photocathodes. A gate-shaped spectral response with a 260-nm
starting wavelength and a 375-nm cut-off wavelength is obtained. Average quantum
efficiency is 15% and short wavelength responses are almost equivalent to long
wavelength ones. The fitted interface recombination velocity is 5?04 cm/s, with
negligible magnitude, proving that the design of the graded buffer layers is
efficient in obtaining good interface quality between the buffer and the emission
layer.
© 2011 Chinese Optics Letters
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