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We have demonstrated a two-color quantum well infrared photodetector (QWIP) exhibiting simultaneous photoresponse with cutoff wavelengths at 11.8 and 14.5 μm, respectively. Strong photocurrent signals are observed at temperature of 77 K. The simultaneous two-color photoresponse is achieved by utilizing a simple design by broadening the width of the quantum well and selecting an appropriate doping density. The two peaks are attributed to the intersubband transitions from the ground state to the first excited state (bound state) and to the fifth excited state (continuum state), respectively.
[1] Li N, Yuan X Z, Li N, Lu W, Li Z F, Dou H F, Shen X C 2000 Acta. Phys. Sin. 49 797 (in Chinese) [李 娜、 袁先漳、 李 宁、 陆 卫、 李志峰、 窦红飞、 沈学础 2000 49 797]
[2] Yuan X Z, Lu W, Li N, Chen X S, Shen X C, Zi J 2003 Acta. Phys. Sin. 52 503 (in Chinese) [袁先漳、 陆 卫、 李 宁、 陈效双、 沈学础、 资剑 2003 52 503]
[3] Koidl P 1992 Appl. Phys. Lett. 61 666
[4] Tidrow M Z, Dyer W R 2001 Infrared Phys and Technol. 42 333
[5] Levine B F, Zussman A, Kuo J M, Jong J D 1992 J. Appl. Phys. 71 5130
[6] Xiong D Y, Li N, Xu W L, Zhen H L, Li Z F, Lu W 2007 Acta. Phys. Sin. 56 5424(in Chinese)[熊大元、 李 宁、 徐文兰、 甄红楼、 李志锋、 陆 卫 2007 56 5424]
[7] Li N,Guo F M,Xiong D Y, Lu W, Wang W X, Huang Q, Zhou J M 2006 Infrared and Laser Engineering 35 756 (in Chinese) [李 宁、 郭方敏、 熊大元、 陆 卫、 王文新、 黄 绮、 周均铭 2006 红外与激光工程 35 756]
[8] Eker S U, Kaldirim M, Arslan Y, Besikci C 2008 IEEE Electron. Dev. Lett. 29 1121
[9] Kheng K, Ramsteiner M, Schneider H, Ralston J D, Fuchs F,
[10] Guo F M, Li N, Xiong D Y, Zhen H L, Xu X Y, Hou Y, Ding R J, Lu W, Huang Q, Zhou J M 2008 Sci. China Ser. G-Phys. Mech. Astron 51 805
[11] Zussman A, Levine B F, Kuo J M, Jong J D 1991 J. Appl. Phys 70 5101
[12] Liu H C, Capasso F 2000 Intersubband Transitions in Quantum Wells (Academic Press) p134
[13] Bandara S V, Gunapala S D, Liu J K, Rafol S B, Hill C J, Ting D Z-Y, Mumolo J M, Trinh T Q, Fastenau J M, Liu A W K 2005 Appl. Phys. Lett. 86 151104
[14] Hasnain G, Levine B F, Gunapala S D, Chand N. 1990 Appl. Phys. Lett. 57 608
[15] Levine B F, Zussman A, Gunapala S D, Asom M T, Kuo J M, Hobson W S 1992 J. Appl. Phys. 72 4429
[16] Choi K K, Fotiadis L, Taysing-Lara M, Chang W, Lafrate G J 1991 Appl. Phys. Lett. 59 3303
[17] West L C, Eglash S J 1985 Appl. Phys. Lett. 46 1156
[18] Levine B F, Bethea C G, Hasnain G, Walker J, Malik R J, Vandenberg J M 1989 Phys. Rev. Lett. 63 899
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[1] Li N, Yuan X Z, Li N, Lu W, Li Z F, Dou H F, Shen X C 2000 Acta. Phys. Sin. 49 797 (in Chinese) [李 娜、 袁先漳、 李 宁、 陆 卫、 李志峰、 窦红飞、 沈学础 2000 49 797]
[2] Yuan X Z, Lu W, Li N, Chen X S, Shen X C, Zi J 2003 Acta. Phys. Sin. 52 503 (in Chinese) [袁先漳、 陆 卫、 李 宁、 陈效双、 沈学础、 资剑 2003 52 503]
[3] Koidl P 1992 Appl. Phys. Lett. 61 666
[4] Tidrow M Z, Dyer W R 2001 Infrared Phys and Technol. 42 333
[5] Levine B F, Zussman A, Kuo J M, Jong J D 1992 J. Appl. Phys. 71 5130
[6] Xiong D Y, Li N, Xu W L, Zhen H L, Li Z F, Lu W 2007 Acta. Phys. Sin. 56 5424(in Chinese)[熊大元、 李 宁、 徐文兰、 甄红楼、 李志锋、 陆 卫 2007 56 5424]
[7] Li N,Guo F M,Xiong D Y, Lu W, Wang W X, Huang Q, Zhou J M 2006 Infrared and Laser Engineering 35 756 (in Chinese) [李 宁、 郭方敏、 熊大元、 陆 卫、 王文新、 黄 绮、 周均铭 2006 红外与激光工程 35 756]
[8] Eker S U, Kaldirim M, Arslan Y, Besikci C 2008 IEEE Electron. Dev. Lett. 29 1121
[9] Kheng K, Ramsteiner M, Schneider H, Ralston J D, Fuchs F,
[10] Guo F M, Li N, Xiong D Y, Zhen H L, Xu X Y, Hou Y, Ding R J, Lu W, Huang Q, Zhou J M 2008 Sci. China Ser. G-Phys. Mech. Astron 51 805
[11] Zussman A, Levine B F, Kuo J M, Jong J D 1991 J. Appl. Phys 70 5101
[12] Liu H C, Capasso F 2000 Intersubband Transitions in Quantum Wells (Academic Press) p134
[13] Bandara S V, Gunapala S D, Liu J K, Rafol S B, Hill C J, Ting D Z-Y, Mumolo J M, Trinh T Q, Fastenau J M, Liu A W K 2005 Appl. Phys. Lett. 86 151104
[14] Hasnain G, Levine B F, Gunapala S D, Chand N. 1990 Appl. Phys. Lett. 57 608
[15] Levine B F, Zussman A, Gunapala S D, Asom M T, Kuo J M, Hobson W S 1992 J. Appl. Phys. 72 4429
[16] Choi K K, Fotiadis L, Taysing-Lara M, Chang W, Lafrate G J 1991 Appl. Phys. Lett. 59 3303
[17] West L C, Eglash S J 1985 Appl. Phys. Lett. 46 1156
[18] Levine B F, Bethea C G, Hasnain G, Walker J, Malik R J, Vandenberg J M 1989 Phys. Rev. Lett. 63 899
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