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Aimming at the decay tendency of reflection-mode negative electron affinity (NEA) GaN photocathode and the different decay speeds of quantum efficiency corresponding to the different wave bands, and referring to the decay tendency of quantum efficiency curve provided by foreign authors for reflection-mode NEA GaN photocathode, the quantum efficiency decay mechanism for reflection-mode NEA GaN photocathode was studied. The surface model ［GaN (Mg) : Cs］: O-Cs for GaN photocathode after being activated with cesium and oxygen was used. And the change of surface barrier in the decay course of quantum efficiency was considered. The reduction of the effective dipole quantity is the basic reason causing quantum efficiency reduction. And it is the change of surface I, II barrier shape that causes the difference of dropping speeds of quantum efficiencies corresponding to different wave bands.
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Keywords:
- negative elctron affinity /
- GaN photocathode /
- quantum efficiency /
- surface barrier
[1] ［1］Peng D S, Feng Y C, Wang W X, Liu X F, Shi W, Niu H B 2006 Acta Phys Sin. 55 3606 (in Chinese)［彭冬生、冯玉春、王文欣、刘晓峰、施炜、牛憨笨 2006 55 3606］
[2] ［2］Liu H F, Chen H, Li Z Q, Wang L, Huang Q, Zhou J M, Luo Y, Han Y J 2000 Acta Phys. Sin. 49 1132 (in Chinese)［刘洪飞、陈弘、李志强、万里、黄绮、周均铭、罗毅、韩英军2000 49 1132］
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[6] ［6］Ulmer M P, Wessels W B, Shahedipour F S, Korotkov R Y, Joseph C, Nihashi T 2001 Proc. SPIE 4288 246
[7] ［7］Uchiyama S, Takagi Y, Niigaki M, Kan H 2005 Appl. Phys. Lett. 86 103511
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[9] ［9］Zhang J M, Zou D S, Xu C, Zhu Y X, Liang T, Da X L, Shen G D 2007 Chin.Phys. 16 1135
[10] ］Tremsin A S, Siegmund O H W 2005 Proc. SPIE 5920 59200Ⅰ
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[14] ］Machuca F 2003 Ph. D. Dissertation (Stanford: Stanford University)
[15] ］Siegmund O H W, Tremsin A S, Martin A, Malloy J, Ulmer M, Wessels B 2003 Proc. SPIE 5164 134
[16] ］Qiao J L, Niu J, Yang Z, Zou J J, Chang B K 2009 Opt. Techniq. 35 145 (in Chinese)［乔建良、牛军、杨智、邹继军、常本康2009 光学技术 35 145］
[17] ］Clark M G 1975 J. Phys. D: Appl. Phys. 8 535
[18] ］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）］
[19] ］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、杨智、高频、乔建良、曾一平 2007 56 6109］
[20] ］Zou J J, Chang B K, Du X Q, Yang Z 2007 Spectroscop. Spect. Anal. 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］
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[1] ［1］Peng D S, Feng Y C, Wang W X, Liu X F, Shi W, Niu H B 2006 Acta Phys Sin. 55 3606 (in Chinese)［彭冬生、冯玉春、王文欣、刘晓峰、施炜、牛憨笨 2006 55 3606］
[2] ［2］Liu H F, Chen H, Li Z Q, Wang L, Huang Q, Zhou J M, Luo Y, Han Y J 2000 Acta Phys. Sin. 49 1132 (in Chinese)［刘洪飞、陈弘、李志强、万里、黄绮、周均铭、罗毅、韩英军2000 49 1132］
[3] ［3］Liu Z, Wang X L, Wang J X, Hu G X, Guo L C , Li J M 2007 Chin.Phys. 16 1467
[4] ［4］Shahedipour F S, Ulmer M P, Wessels B W, Joseph C L, Nihashi T 2002 IEEE J. Quantum Electron. 38 333
[5] ［5］Ulmer M P, Wessels B W, Han B, Gregie J, Tremsin A, Siegmund O H W 2003 Proc. SPIE 5164 144
[6] ［6］Ulmer M P, Wessels W B, Shahedipour F S, Korotkov R Y, Joseph C, Nihashi T 2001 Proc. SPIE 4288 246
[7] ［7］Uchiyama S, Takagi Y, Niigaki M, Kan H 2005 Appl. Phys. Lett. 86 103511
[8] ［8］Zhang J F, Wang C, Zhang J C, Hao Y 2006 Chin.Phys. 15 1060
[9] ［9］Zhang J M, Zou D S, Xu C, Zhu Y X, Liang T, Da X L, Shen G D 2007 Chin.Phys. 16 1135
[10] ］Tremsin A S, Siegmund O H W 2005 Proc. SPIE 5920 59200Ⅰ
[11] ］Wu C I, Kahn A 2000 Appl. Surf. Sci. 162 250
[12] ］Wu C I, Kahn A 1999 J. Appl. Phys. 86 3209
[13] ］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］
[14] ］Machuca F 2003 Ph. D. Dissertation (Stanford: Stanford University)
[15] ］Siegmund O H W, Tremsin A S, Martin A, Malloy J, Ulmer M, Wessels B 2003 Proc. SPIE 5164 134
[16] ］Qiao J L, Niu J, Yang Z, Zou J J, Chang B K 2009 Opt. Techniq. 35 145 (in Chinese)［乔建良、牛军、杨智、邹继军、常本康2009 光学技术 35 145］
[17] ］Clark M G 1975 J. Phys. D: Appl. Phys. 8 535
[18] ］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）］
[19] ］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、杨智、高频、乔建良、曾一平 2007 56 6109］
[20] ］Zou J J, Chang B K, Du X Q, Yang Z 2007 Spectroscop. Spect. Anal. 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］
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