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Research on quantum efficiency formula for extended blue transmission–mode GaAlAs/GaAs photocathodes

XINLONG CHEN1, YIJUN ZHANG1, BENKANG CHANG1,* , PIN GAO1, JING ZHAO1, FENG SHI1,2

Affiliation

  1. Institute of Electronic Engineering and Optoelectronic Technology, Nanjing University of Science and Technology, Nanjing 210094, China
  2. Key Laboratory of Low Light Level Technology of COSTIND, Xi’an 710065, China

Abstract

The quantum efficiency formula of the transmission-mode photocathodes is solved from the one-dimensional continuity equation, in which the photoelectrons generated in the GaAlAs layer are considered. According to the quantum efficiency formula, we analyze the impact of some relational performance parameters on the quantum efficiency, such as the interface recombination velocity, the thickness of both GaAlAs and GaAs layers and so on. Besides, we use the quantum efficiency formula to fit the experimental curve. The results show that compared with the conventional quantum efficiency formula, the solved quantum efficiency formula is more suitable to the extended blue transmission-mode photocathode with a thin GaAlAs layer..

Keywords

GaAlAs layer, Transmission-mode photocathodes, Quantum efficiency formula, Extended blue.

Citation

XINLONG CHEN, YIJUN ZHANG, BENKANG CHANG, PIN GAO, JING ZHAO, FENG SHI, Research on quantum efficiency formula for extended blue transmission–mode GaAlAs/GaAs photocathodes, Optoelectronics and Advanced Materials - Rapid Communications, 6, 1-2, January-February 2012, pp.307-312 (2012).

Submitted at: Nov. 30, 2011

Accepted at: Feb. 20, 2012