Influences of material performance parameters of GaAs/AlGaAs photoemission

Xiaoqing Du; Benkang Chang

doi:10.1117/12.519908

12 May 2004 Influence of material performance parameters of GaAs/AlGaAs photoemission

Xiaoqing Du, Benkang Chang

Proceedings Volume 5280, Materials, Active Devices, and Optical Amplifiers; (2004) https://doi.org/10.1117/12.519908
Event: Asia-Pacific Optical and Wireless Communications, 2003, Wuhan, China

Abstract

Photocathode based on GaAs/AlGaAs heterojunction has been applied broadly for its broad spectral response wavelength, high quantum efficiency and low dark current. To obtain more effective photoemission, reasonable selection of material parameters of GaAs/AlGaAs heterojunction is required. In this paper on basis of three step photoemission model, the dependence of adsorption coefficient of GaAs, electron diffusion length and surface escape probability on p-type doping concentration are made analysis, and theoretic quantum efficiency of GaAs/AlGaAs heterojunction photocathodes for different doping concentrations are deduced. From the calculated results the optimum doping concentration for p-type GaAs is between 3.0×10¹⁸cm^-3and 6.0×10¹⁸cm^-3and response threshold wavelength moves towards long-wave with doping concentration increases.

Citation Download Citation

Xiaoqing Du and Benkang Chang "Influence of material performance parameters of GaAs/AlGaAs photoemission", Proc. SPIE 5280, Materials, Active Devices, and Optical Amplifiers, (12 May 2004); https://doi.org/10.1117/12.519908

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