TITLE

Li[sub 2]CsSb: A highly-efficient photocathode material

AUTHOR(S)
Ettema, A. R. H. F.
PUB. DATE
June 2003
SOURCE
Applied Physics Letters;6/2/2003, Vol. 82 Issue 22, p3988
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The electronic band structure of the alkali antimonide Li[sub 2]CsSb has been calculated. Based on this calculation, estimates are given for the absorption coefficient and the radiative lifetime of the photoelectron. The optical generation of photoelectrons in this material proceeds via a direct optical transition, but after relaxation of the photoelectron it is prohibited to recombine with a valence band hole due to the indirect band gap. The photoelectron lifetime and the diffusion lengths are compared with other photocathode materials. The results suggest that for Li[sub 2]CsSb the photocathode can be made significantly thicker and therefore more efficient. © 2003 American Institute of Physics.
ACCESSION #
9885172

 

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