Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spie.5164..144u&link_type=abstract
UV/EUV and Visible Space Instrumentation for Astronomy II. Edited by Siegmund, Oswald H. W. Proceedings of the SPIE, Volume 516
Astronomy and Astrophysics
Astronomy
6
Scientific paper
Our work with GaN based photocathodes shows a strong dependence on the photo-emission response versus the carrier concentration and conductivity of the films. Films with quantum efficiency (QE) as high as 56% in opaque mode and as high as 30% in transmission mode have been made. Although surface activation plays a key role, the characteristics of the films, e.g. the thickness, film structure, minority carrier diffusion length, and doping, all play a role in affecting the photo-emission QE and especially its spectral dependence. The QE of films with the various properties is discussed and the utility of using measurements of the film properties to predict the optimal performance of the resulting photocathode is demonstrated.
Gregie Joel
Han Bing
Siegmund Oswald H. W.
Tremsin Anton
Ulmer Melville P.
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