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Aiming at determining the quantum efficiency of fully activated negative electron affinity(NEA) GaN photocathodes, we have investigated the spectral response of NEA GaN photocathodes by using a dedicated ultraviolet spectral response measurement instrument. The quantum efficiency curve of reflection-mode NEA GaN photocathode has been obtained in the band region from 230nm to 400nm. The experimental results show that the quantum efficiency of reflection-mode NEA GaN photocathode reaches up to 37.4% at 230 nm, and at 365 nm, which is the threshold of GaN photocathode, the quantum efficiency remains 3.75%. A sharp cutoff characteristic with over two orders of magnitude degradation from 230 nm to 400 nm has been observed. Based on the former research results, the factors influencing quantum efficiency were also comprehensively analyzed in the paper.
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Keywords:
- negative electron affinity /
- GaN photocathode /
- spectral response /
- reflection-mode
[1] ［1］You D, Tang Y W, Zhao D G, Xu J T, Xu Y H, Gong H M 2006 Chinese Journal of Semiconductors 27 896（in Chinese）［游达、汤英文、赵德刚、许金通、徐运华、龚海梅 2006 半导体学报 27 896］
[2] ［2］Zhou M, Zhao D G 2008 Acta Phys. Sin. 57 4570 (in Chinese)［周梅、赵德刚 2008 57 4570］
[3] ［3］Siegmund O H W, Tremsin A S, Martin A, Malloy J, Ulmer M, Wessels B 2003 Proc. SPIE 5164 134
[4] ［4］Spicer W E, HerreraGómez A 1993 Proc. SPIE 2022 19
[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］Uchiyama S, Takagi Y, Niigaki M, Kan H 2005 Appl. Phys. Lett. 86 103511
[7] ［7］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］
[8] ［8］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］
[9] ［9］Qian Y S, Zong Z Y, Chang B K 2000 Vacuum Science and Technology(China) 20 305 (in Chinese) ［钱芸生、宗志园、常本康 2000 真空科学与技术 20 305］
[10] ］Machuca F 2003 Ph. D. Dissertation ( Stanford: StanfordUniversity)
[11] ］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
[12] ］Kang J Y, Huang Q S, Ogawa T 1994 Acta Phys. Sin.. 48 1372 (in Chinese)［康俊勇、黄启圣、小川智哉 1999 48 1372］
[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] ］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］
[15] ］Ulmer M P, Wessels W B, Shahedipour F S, Korotkov R Y, Joseph C, Nihashi T 2001 Proc. SPIE 4288 246
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[1] ［1］You D, Tang Y W, Zhao D G, Xu J T, Xu Y H, Gong H M 2006 Chinese Journal of Semiconductors 27 896（in Chinese）［游达、汤英文、赵德刚、许金通、徐运华、龚海梅 2006 半导体学报 27 896］
[2] ［2］Zhou M, Zhao D G 2008 Acta Phys. Sin. 57 4570 (in Chinese)［周梅、赵德刚 2008 57 4570］
[3] ［3］Siegmund O H W, Tremsin A S, Martin A, Malloy J, Ulmer M, Wessels B 2003 Proc. SPIE 5164 134
[4] ［4］Spicer W E, HerreraGómez A 1993 Proc. SPIE 2022 19
[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］Uchiyama S, Takagi Y, Niigaki M, Kan H 2005 Appl. Phys. Lett. 86 103511
[7] ［7］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］
[8] ［8］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］
[9] ［9］Qian Y S, Zong Z Y, Chang B K 2000 Vacuum Science and Technology(China) 20 305 (in Chinese) ［钱芸生、宗志园、常本康 2000 真空科学与技术 20 305］
[10] ］Machuca F 2003 Ph. D. Dissertation ( Stanford: StanfordUniversity)
[11] ］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
[12] ］Kang J Y, Huang Q S, Ogawa T 1994 Acta Phys. Sin.. 48 1372 (in Chinese)［康俊勇、黄启圣、小川智哉 1999 48 1372］
[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] ］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］
[15] ］Ulmer M P, Wessels W B, Shahedipour F S, Korotkov R Y, Joseph C, Nihashi T 2001 Proc. SPIE 4288 246
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