Influence of air exposure on CsI photocathodes

被引：13

作者：

Xie, Yuguang ^{[1
,2
]}

Zhang, Aiwu ^{[1
,2
,3
]}

Liu, Yingbiao ^{[1
,2
,3
]}

Liu, Hongbang ^{[3
,4
]}

Hu, Tao ^{[1
,2
]}

Zhou, Li ^{[1
,2
]}

Cai, Xiao ^{[1
,2
]}

Fang, Jian ^{[1
,2
]}

Yu, Boxiang ^{[1
,2
]}

Ge, Yongshuai ^{[1
,2
,3
]}

Lu, Qiwen ^{[5
]}

Sun, Xilei ^{[1
,2
]}

Sun, Lijun ^{[1
,2
]}

Xue, Zheng ^{[1
,2
]}

Xie, Yigang ^{[3
]}

Zheng, Yangheng ^{[3
]}

Lu, Junguang ^{[1
,2
]}

机构：

[1] Chinese Acad Sci, Inst High Energy Phys, State Key Lab Particle Detect & Elect, Beijing 100049, Peoples R China

[2] Univ Sci & Technol China, Beijing 100049, Peoples R China

[3] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

[4] Guangxi Univ, Nanning 530004, Peoples R China

[5] Shanxi Univ, Taiyuan 030006, Peoples R China

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2012年 / 689卷

基金：

中国国家自然科学基金;

关键词：

CsI photocathode; Air exposure; Quantum efficiency; Surface morphology; XPS; PHYSICS EXPERIMENTS; QUANTUM EFFICIENCY;

D O I：

10.1016/j.nima.2012.06.023

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

We investigate the influence of air exposure on the quantum efficiency (QE) and surface morphology of CsI photocathodes (PCs), at relative humidities (RH) higher than 80% down to nearly 3% (both at room temperature) and a 60 degrees C baking condition. By atomic force microscopy (AFM) surface analysis, it is clearly seen that RH > 60% speeds up water film formation and CsI dissolution on the surface of the photocathode at the minute scale, while both grain size and QE change slowly at RH <30% at the hour scale. In the baking environment, the peak QE decreases less than 1.5% (absolute) within one week, and a stainless steel substrate and electron beam evaporation technique tend to effectively weaken the influence of air. With an Au-coated FR-4 Substrate, the QE degradation is found to strongly depend on wavelength in the range of 120-210 nm. According to spectra of X-ray photoelectron spectroscopy (XPS), an excess of cesium was observed and the chemical reaction between water and CsI when exposed to humid air is proved. It is found that carbon, and not H2O or O-2, is the main pollutant in the baking condition. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：79 / 86

页数：8

共 14 条

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