Influence of air exposure on CsI photocathodes
Xie YG(谢宇广); Zhang AW(章爱武); Liu YB(刘颖彪); Xie, YG; Zhang, AW; Liu, YB; Liu, HB; Hu, T; Zhou, L; Cai, X; Fang, J; Yu, BX; Ge, YS; Lu, QW; Sun, XL; Sun, LJ; Xue, Z; Xie, YG; Zheng, YH; Lu, JG; Hu T(胡涛); Zhou L(周莉); Cai X(蔡啸); Fang J(方建); Yu BX(俞伯祥); Ge YS(葛永帅); Sun XL(孙希磊); Sun LJ(孙丽君); Xue Z(薛镇); Lv JG(吕军光)
刊名NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
2012
卷号689页码:79-86
关键词CsI photocathode Air exposure Quantum efficiency Surface morphology XPS
学科分类Instruments & Instrumentation; Nuclear Science & Technology; Physics; Spectroscopy
DOI10.1016/j.nima.2012.06.023
英文摘要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.
收录类别SCI
WOS记录号WOS:000307797500013
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被引频次:6[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/223827
专题中国科学院高能物理研究所_实验物理中心_期刊论文
中国科学院高能物理研究所_实验物理中心
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Xie YG,Zhang AW,Liu YB,et al. Influence of air exposure on CsI photocathodes[J]. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT,2012,689:79-86.
APA 谢宇广.,章爱武.,刘颖彪.,Xie, YG.,Zhang, AW.,...&吕军光.(2012).Influence of air exposure on CsI photocathodes.NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT,689,79-86.
MLA 谢宇广,et al."Influence of air exposure on CsI photocathodes".NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT 689(2012):79-86.
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