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Preparation and evaluation system for NEA GaN photocathode

XIAOHUI WANG1,* , BENKANG CHANG1, YUNSHENG QIAN1, YUJIE DU1, HONGGANG WANG1, BIAO LI1

Affiliation

  1. Department of Electronic Engineering and Optoelectronic Technology, Nanjing University of Science and Technology, Nanjing, Jiangsu 210094, People’s Republic of China

Abstract

To obtain and evaluate negative electron affinity (NEA) GaN photocathode, preparation and evaluation system has been designed. The system includes multi-information test system, ultrahigh vacuum (UHV) activation system, and surface analysis system. GaN photocathode, which had been etched by a 2:2:1 solution of sulfuric acid, hydrogen peroxide and de-ionized water, was analyzed by the surface analysis system. Then the GaN photocathode was transferred to the UHV system where it was cleaned by heating at 710 , and soon was activated by Cs/O. By use of the multi-information test system, vacuum level and composition of the residual gas were recorded during the heating process, photocurrent was recorded during the activation, and quantum efficiency of NEA GaN photocathode was tested..

Keywords

Negative electron affinity, GaN photocathode, Preparation and evaluation system.

Citation

XIAOHUI WANG, BENKANG CHANG, YUNSHENG QIAN, YUJIE DU, HONGGANG WANG, BIAO LI, Preparation and evaluation system for NEA GaN photocathode, Optoelectronics and Advanced Materials - Rapid Communications, 5, 9, September 2011, pp.1007-1010 (2011).

Submitted at: July 20, 2011

Accepted at: Sept. 15, 2011