Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Effect of different epitaxial structures on GaAs photoemission

Not Accessible

Your library or personal account may give you access

Abstract

The quantum efficiency equations of two different structure reflection-mode GaAs photocathodes with back interface recombination velocity have been solved from the diffusion equations. One structure consists of GaAs substrate and an epitaxial GaAs active layer (GaAs-GaAs) and another structure consists of GaAs substrate, an epitaxial AlGaAs buffer layer, and a GaAs active layer (AlGaAs-GaAs). The experimental results show that the quantum efficiency of long-wavelength photons and the integral sensitivities for GaAs-GaAs cathodes both increase with the increase in the active layer thickness, which is due to the increase of electron diffusion length. The quantum efficiency of long-wavelength photons and the integral sensitivity of AlGaAs-GaAs cathodes are greater than those of GaAs-GaAs cathodes with an identical active layer thickness, which is attributed to the AlGaAs buffer layer. The buffer layer can reflect electrons and improve the quality of the GaAs active layer. Through the theoretical simulation, we found the active layer thickness for AlGaAs-GaAs cathodes has an optimum value at which the cathodes achieve the maximum sensitivity.

© 2011 Optical Society of America

Full Article  |  PDF Article
More Like This
Effects of graded band-gap structures on spectral response of AlGaAs/GaAs photocathodes

Jijun Zou, Yijun Zhang, Wenjuan Deng, Xincun Peng, Shaotao Jiang, and Benkang Chang
Appl. Opt. 54(28) 8521-8525 (2015)

Photoemission from advanced heterostructured AlxGa1-xAs/GaAs photocathodes under multilevel built-in electric field

Cheng Feng, Yijun Zhang, Yunsheng Qian, Benkang Chang, Feng Shi, Gangcheng Jiao, and Jijun Zou
Opt. Express 23(15) 19478-19488 (2015)

Comparative research on GaAs photocathodes before and after activation

Liang Chen, Yunsheng Qian, and Benkang Chang
Appl. Opt. 50(22) 4457-4462 (2011)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (6)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Tables (1)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (7)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved