Photocathode electron beam sources using GaN and InGaN with NEA surface

T. Nishitani; T. Maekawa; M. Tabuchi; T. Meguro; Y. Honda; H. Amano

doi:10.1117/12.2076681

13 March 2015 Photocathode electron beam sources using GaN and InGaN with NEA surface

T. Nishitani, T. Maekawa, M. Tabuchi, T. Meguro, Y. Honda, H. Amano

Proceedings Volume 9363, Gallium Nitride Materials and Devices X; 93630T (2015) https://doi.org/10.1117/12.2076681
Event: SPIE OPTO, 2015, San Francisco, California, United States

Abstract

A photocathode electron source using p-type GaN and p-type InGaN semiconductors with a negative electron affinity (NEA) surface has been studied for its ability to maintain an extended NEA state. The key technology of NEA photocathodes is the formation of electric dipoles by atoms on the surface, which makes it possible for photo excited electrons in the conduction band minimum to escape into the vacuum. This means that in order to keep the electron energy spread as small as possible, the excitation photon energy should be tuned to the band gap energy. However, the NEA surface is damaged by the adsorption of residual gas and the back-bombardment of ionized residual gas by photoelectrons. The p-type GaN and InGaN semiconductors were measured a lifetime of quantum yield of excitation energy corresponding to the band gap energy in comparison to the p-type GaAs as the conventional NEA photocathode. Lifetime of NEA-photocathodes using the GaN and InGaN were 21 times and 7.7 times longer respectively than that using the GaAs.

Citation Download Citation

T. Nishitani, T. Maekawa, M. Tabuchi, T. Meguro, Y. Honda, and H. Amano "Photocathode electron beam sources using GaN and InGaN with NEA surface", Proc. SPIE 9363, Gallium Nitride Materials and Devices X, 93630T (13 March 2015); https://doi.org/10.1117/12.2076681

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available