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In order to investigate the decay tendency and the recovery status of the quantum efficiency of reflection-mode NEA GaN photocathode, the quantum efficiency curves have been studied after the photocathode was fully activated, stored in system and supplemented with Cs. The quantum efficiency decay and recovery processes of reflection-mode NEA GaN photocathode were observed and the mechanism was discussed. The quantum efficiency value of reflection-mode NEA GaN photocathode can be recovered up to more than 94% of the best value in the shortwave region between 240nm and 300nm, and more than 88% in the long wave region between 300nm and 375nm after Cs supplement. Based on the changes of surface potential barrier profiles of the reflection-mode NEA GaN photocathode before and after the quantum efficiency degradation and the quantum yield formula, the decay characteristic and the recovery status of quantum efficiency curve after supplement with Cs have been related to the changes of surface barrier shapes.
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Keywords:
- reflection-mode /
- NEA /
- GaN photocathode /
- quantum efficiency
[1] Shahedipour F S, Ulmer M P, Wessels B W, Joseph C L, Nihashi T 2002 IEEE J. Quantum Electron. 38 333
[2] Ulmer M P, Wessels B W, Han B, Gregie J, Tremsin A, Siegmund O H W 2003 Proc. SPIE 5164 144
[3] Uchiyama S, Takagi Y, Niigaki M, Kan H 2005 Appl. Phys. Lett. 86 103511
[4] Siegmund O, Vallerga J, Mcphate J, Malloy J, Tremsin A, Martin A, Ulmer M, Wessels B 2006 Nuclear Instruments and Methods in Physics Research A 567 89
[5] Zhou M, Zuo S H, Zhao D G 2007 Acta Phys. Sin. 56 5513 (in Chinese)[周 梅、 左淑华、 赵德刚 2007 56 5513]
[6] Zhou M, Zhao D G 2008 Acta Phys. Sin. 57 4570 (in Chinese)[周 梅、 赵德刚 2008 57 4570]
[7] Zhou M, Zhao D G 2009 Acta Phys. Sin. 58 7255 (in Chinese)[周 梅、 赵德刚 2009 58 7255]
[8] Machuca F 2003 Ph. D. Dissertation (Stanford: Stanford University)
[9] Yan J L, Zhu C C, Xiang S M 2001 J. Infrared Millim. Waves 20 157 (in Chinese)[闫金良、 朱长纯、 向世明 2001 红外与毫米波学报 20 157]
[10] Guo T L, Gao H R 1993 Proc. SPIE 1982 127
[11] Zou J J, Chang B K, Yang Z, Gao P, Qiao J L, Zeng Y P 2007 Acta Phys. Sin. 56 6109 (in Chinese)[邹继军、 常本康、 杨 〖12] Qiao J L, Tian S, Chang B K, Du X Q, Gao P 2009 Acta Phys. Sin. 58 5847 (in Chinese)[乔建良、 田 思、 常本康、 杜晓晴、 高 频 2009 58 5847]
[12] Qiao J L, Chang B K, Qian Y S, Du X Q, Zhang Y J, Gao P, Wang X H, Guo X Y, Niu J, Gao Y T 2010 Acta Phys. Sin. 59 3577 (in Chinese)[乔建良、 常本康、 钱芸生、 杜晓晴、 张益军、 高 频、 王晓晖、 郭向阳、 牛 军、 高有堂 2010 59 3577]
[13] Zou J J 2007 Ph. D. Dissertation (Nanjing University of Science and Technology) (in Chinese)[邹继军 2007 博士学位论文(南京理工大学)]
[14] Qiao J L, Niu J, Yang Z, Zou J J, Chang B K 2009 Optical Technique 35 145 (in Chinese)[乔建良、 牛 军、 杨 智、 邹继军、 常本康 2009 光学技术 35 145]
[15] Qiao J L, Chang B K, Du X Q, Niu J, Zou J J 2010 Acta Phys. Sin. 59 2855 (in Chinese)[乔建良、 常本康、 杜晓晴、 牛 军、 邹继军 2010 59 2855]
[16] Zou J J, Chang B K, Du X Q, Yang Z 2007 Spectroscopy and Spectral Analysis 27 1465 (in Chinese)[邹继军、 常本康、 杜晓晴、 杨 智 2007 光谱学与光谱分析 27 1465]
[17] Zou J J, Chang B K, Yang Z 2007 Acta Phys. Sin. 56 2992 (in Chinese)[邹继军、 常本康、 杨 智 2007 56 2992]
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[1] Shahedipour F S, Ulmer M P, Wessels B W, Joseph C L, Nihashi T 2002 IEEE J. Quantum Electron. 38 333
[2] Ulmer M P, Wessels B W, Han B, Gregie J, Tremsin A, Siegmund O H W 2003 Proc. SPIE 5164 144
[3] Uchiyama S, Takagi Y, Niigaki M, Kan H 2005 Appl. Phys. Lett. 86 103511
[4] Siegmund O, Vallerga J, Mcphate J, Malloy J, Tremsin A, Martin A, Ulmer M, Wessels B 2006 Nuclear Instruments and Methods in Physics Research A 567 89
[5] Zhou M, Zuo S H, Zhao D G 2007 Acta Phys. Sin. 56 5513 (in Chinese)[周 梅、 左淑华、 赵德刚 2007 56 5513]
[6] Zhou M, Zhao D G 2008 Acta Phys. Sin. 57 4570 (in Chinese)[周 梅、 赵德刚 2008 57 4570]
[7] Zhou M, Zhao D G 2009 Acta Phys. Sin. 58 7255 (in Chinese)[周 梅、 赵德刚 2009 58 7255]
[8] Machuca F 2003 Ph. D. Dissertation (Stanford: Stanford University)
[9] Yan J L, Zhu C C, Xiang S M 2001 J. Infrared Millim. Waves 20 157 (in Chinese)[闫金良、 朱长纯、 向世明 2001 红外与毫米波学报 20 157]
[10] Guo T L, Gao H R 1993 Proc. SPIE 1982 127
[11] Zou J J, Chang B K, Yang Z, Gao P, Qiao J L, Zeng Y P 2007 Acta Phys. Sin. 56 6109 (in Chinese)[邹继军、 常本康、 杨 〖12] Qiao J L, Tian S, Chang B K, Du X Q, Gao P 2009 Acta Phys. Sin. 58 5847 (in Chinese)[乔建良、 田 思、 常本康、 杜晓晴、 高 频 2009 58 5847]
[12] Qiao J L, Chang B K, Qian Y S, Du X Q, Zhang Y J, Gao P, Wang X H, Guo X Y, Niu J, Gao Y T 2010 Acta Phys. Sin. 59 3577 (in Chinese)[乔建良、 常本康、 钱芸生、 杜晓晴、 张益军、 高 频、 王晓晖、 郭向阳、 牛 军、 高有堂 2010 59 3577]
[13] Zou J J 2007 Ph. D. Dissertation (Nanjing University of Science and Technology) (in Chinese)[邹继军 2007 博士学位论文(南京理工大学)]
[14] Qiao J L, Niu J, Yang Z, Zou J J, Chang B K 2009 Optical Technique 35 145 (in Chinese)[乔建良、 牛 军、 杨 智、 邹继军、 常本康 2009 光学技术 35 145]
[15] Qiao J L, Chang B K, Du X Q, Niu J, Zou J J 2010 Acta Phys. Sin. 59 2855 (in Chinese)[乔建良、 常本康、 杜晓晴、 牛 军、 邹继军 2010 59 2855]
[16] Zou J J, Chang B K, Du X Q, Yang Z 2007 Spectroscopy and Spectral Analysis 27 1465 (in Chinese)[邹继军、 常本康、 杜晓晴、 杨 智 2007 光谱学与光谱分析 27 1465]
[17] Zou J J, Chang B K, Yang Z 2007 Acta Phys. Sin. 56 2992 (in Chinese)[邹继军、 常本康、 杨 智 2007 56 2992]
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