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In order to research the factors that affect the current uniformity of Flip-chip LEDs, the three-dimensional model of LED chip is established by the finite-element analysis software COMSOL4.0. The influences of chip size, electrode structure and current injection bump on the electrical property of the LED are investigated. The simulation results show that the non-uniform current distribution of LED chip changes exponentially with the increase of the chip size. Interdigitated electrode structure can reduce the lateral resistance effectively by shorting the channel that current flows through. The reasonable design of the bump on the block electrode can also make current even by reducing the lateral resistance.
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Keywords:
- flip-chip light-emitting diodes(FC-LEDs) /
- finite element analysis (FEA) /
- current spreading /
- lateral resistance
[1] Schubert E F, Kim J K 2005 Science 308 1274
[2] Xing Y H, Han J, Deng J, Li J J, Shen G D 2010 Acta Phys. Sin. 59 1233 (in Chinese) [邢艳辉, 韩军, 邓军, 李建军, 徐晨, 沈光地 2010 59 1233]
[3] Horng R H, Chiang C C, Wuu D S 2009 Electrochem Solid-State Lett. 12 H222
[4] Malyutenko V K, Bolgov S S, Podoltsev 2010 A. D. Applied Physics Letters 97
[5] Zhao D G, Zhou S H 2007 Acta Phys. Sin. 56 5513 (in Chinese) [赵德刚, 周梅, 左淑华 2007 56 5513]
[6] Lee J R, Na S I, Jeong J H 2005 Electrochem. Soc. 152 G92
[7] Hyunsoo Kim, Park Seong Ju 2000 Applied Physics Letters 81 1326
[8] Hyunsoo Kim, Seong Ju Park 2001 IEEE Transactions on Electron Devices 48 1065
[9] Guo X, Schubert E F 2001 Applied Physics Letters 78 3337
[10] Lee Song Jae 2004 Proc of SPIE 5530 345
[11] Sheu G J, Hwu F S 2008 The Electrochemical Society 155 H836
[12] Kim M H, Schubert M F, Dai D, Kim J K 2007 Appl. Phys. Lett. 91 183507
[13] Huang S J, Wu H, Fan B F, Zhang B J 2010 Journal of Applied Physics 107 1
[14] Ebong A, Arthur S, Downey E 2003 Solid-State Electronics 47 1817
[15] Neamen D A 2010 Semiconductor Physics and Devices (Beijing: Publishing House of Electronics Industry) p20---p70
[16] Sheng J, Xie S Q 2005 Probability and Mathematical Statistics (Beijing: Higher Education Press) p50---p70 (in Chinese) [盛骤, 谢式千 2005 概率论与数理统计 (北京: 高等教育出版社50---70页]
[17] Yi X Y, Guo J X 2006 Journal of Optoelectronics· Laser16 693
[18] Wataru Ochiai, Ryosuke Kawai, Atsushi Suzuki 2009 Phys. Status Solidi C 6 1417
[19] Zhang J M, Zou D S, Xu C, Gu X L, Shen G D 2007 Acta Phys. Sin. 56 6004 (in Chinese) [张剑铭, 邹德恕, 徐晨, 顾晓玲, 沈光地 2007 56 6004]
[20] Xu B, Yu Q X, Wu Q H, Liao Y, Wang G Z, Fang R C 2010 Acta Phys. Sin. 59 1233 (in Chinese) [徐波, 余庆选, 吴气虹, 廖源, 王冠中, 方容川 2010 59 1233]
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[1] Schubert E F, Kim J K 2005 Science 308 1274
[2] Xing Y H, Han J, Deng J, Li J J, Shen G D 2010 Acta Phys. Sin. 59 1233 (in Chinese) [邢艳辉, 韩军, 邓军, 李建军, 徐晨, 沈光地 2010 59 1233]
[3] Horng R H, Chiang C C, Wuu D S 2009 Electrochem Solid-State Lett. 12 H222
[4] Malyutenko V K, Bolgov S S, Podoltsev 2010 A. D. Applied Physics Letters 97
[5] Zhao D G, Zhou S H 2007 Acta Phys. Sin. 56 5513 (in Chinese) [赵德刚, 周梅, 左淑华 2007 56 5513]
[6] Lee J R, Na S I, Jeong J H 2005 Electrochem. Soc. 152 G92
[7] Hyunsoo Kim, Park Seong Ju 2000 Applied Physics Letters 81 1326
[8] Hyunsoo Kim, Seong Ju Park 2001 IEEE Transactions on Electron Devices 48 1065
[9] Guo X, Schubert E F 2001 Applied Physics Letters 78 3337
[10] Lee Song Jae 2004 Proc of SPIE 5530 345
[11] Sheu G J, Hwu F S 2008 The Electrochemical Society 155 H836
[12] Kim M H, Schubert M F, Dai D, Kim J K 2007 Appl. Phys. Lett. 91 183507
[13] Huang S J, Wu H, Fan B F, Zhang B J 2010 Journal of Applied Physics 107 1
[14] Ebong A, Arthur S, Downey E 2003 Solid-State Electronics 47 1817
[15] Neamen D A 2010 Semiconductor Physics and Devices (Beijing: Publishing House of Electronics Industry) p20---p70
[16] Sheng J, Xie S Q 2005 Probability and Mathematical Statistics (Beijing: Higher Education Press) p50---p70 (in Chinese) [盛骤, 谢式千 2005 概率论与数理统计 (北京: 高等教育出版社50---70页]
[17] Yi X Y, Guo J X 2006 Journal of Optoelectronics· Laser16 693
[18] Wataru Ochiai, Ryosuke Kawai, Atsushi Suzuki 2009 Phys. Status Solidi C 6 1417
[19] Zhang J M, Zou D S, Xu C, Gu X L, Shen G D 2007 Acta Phys. Sin. 56 6004 (in Chinese) [张剑铭, 邹德恕, 徐晨, 顾晓玲, 沈光地 2007 56 6004]
[20] Xu B, Yu Q X, Wu Q H, Liao Y, Wang G Z, Fang R C 2010 Acta Phys. Sin. 59 1233 (in Chinese) [徐波, 余庆选, 吴气虹, 廖源, 王冠中, 方容川 2010 59 1233]
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