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利用表面微结构提高波长上转换红外探测器效率

王超 郝智彪 王磊 康健彬 谢莉莉 罗毅 汪莱 王健 熊兵 孙长征 韩彦军 李洪涛 王禄 王文新 陈弘

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利用表面微结构提高波长上转换红外探测器效率

王超, 郝智彪, 王磊, 康健彬, 谢莉莉, 罗毅, 汪莱, 王健, 熊兵, 孙长征, 韩彦军, 李洪涛, 王禄, 王文新, 陈弘

Improvement on the efficiency of up-conversion infrared photodetectors using surface microstructure

Wang Chao, Hao Zhi-Biao, Wang Lei, Kang Jian-Bin, Xie Li-Li, Luo Yi, Wang Lai, Wang Jian, Xiong Bing, Sun Chang-Zheng, Han Yan-Jun, Li Hong-Tao, Wang Lu, Wang Wen-Xin, Chen Hong
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  • 波长上转换红外探测器具有实现大面阵焦平面的优势, 但光提取效率是制约器件整体效率的关键因素之一. 本文主要研究利用表面微结构来提高波长上转换红外探测器的效率. 首先通过仿真计算研究了表面微结构参数对光提取效率的影响, 然后基于优化设计的参数, 采用聚苯乙烯纳米球掩膜刻蚀的方法制作了具有圆台型表面微结构的波长上转换红外探测器. 测试结果表明, 具有表面微结构的器件的光提取效率比无表面微结构的器件提高了130%. 本文制作表面微结构的方法可以实现波长上转换红外探测器件整体效率的提高.
    In recent decades, infrared (IR) detection technology has been widely used in many fields such as weather monitoring, environmental protection, medical diagnostics, security protection, etc. With the progress and mature of the technologies, more attention has been paid to the imaging detections of weak IR signals. So the higher efficiency of the device is required. Moreover the next-generation IR photodetection technology focuses on large-scale, high-speed and low-dark-current imaging. The mechanical bonding between infrared detector chip and silicon readout circuit inevitably causes a thermal mismatch problem. Up-conversion IR photodetectors can solve the problem about the performance deterioration of photodetector and the thermal mismatch with silicon-based readout circuit, hence they have great advantages in realizing large-format focal plane array detection.However, the poor light extraction efficiency due to total reflection severely restricts the overall efficiency of the up-conversion device, which has become one of the bottlenecks to improve the device efficiency. In this paper, surface microstructures with micro-pillar morphology are designed and fabricated on quantum-cascade up-conversion IR photodetectors. The effect on the up-conversion efficiency is investigated by enhancing the light extraction efficiency.Firstly, by the optical ray retracing method, the influence of surface microstructure on light extraction efficiency is studied when considering different morphology parameters, and optimized surface microstructure is designed to possess a pillar base length of 150 nm, height of 105 nm and side wall angle of 75.Then based on the results of simulation, up-conversion IR photodetectors with surface microstructures are fabricated using polystyrene nanospheres as mask. The self-assembled monolayer nanospheres are first etched to a proper size by using O2 plasma, then the patterns are transferred to SiNx film, which acts as an ICP dry etching mask of the micro-pillars. Finally, the up-conversion device and a silicon detector are together loaded on a cold finger of a cryogenic dewar. The characteristics of the up-converter and up-conversion system are evaluated using a blackbody source.The experimental results show that the devices with and without surface microstructure exhibit similar IR responses and dark currents, while the emission of device with microstructure is obviously increased. Taking into consideration other factors related to external quantum efficiency, the light extraction efficiency of the device with micro-pillar structure on surface can be increased by up to 130%. Therefore it can be concluded that this method is an efficient way to improve the efficiency of up-conversion IR photodetector. The finding in this paper can also be applied to other semiconductor device with light extraction efficiency.
      通信作者: 郝智彪, zbhao@tsinghua.edu.cn;luoy@tsinghua.edu.cn ; 罗毅, zbhao@tsinghua.edu.cn;luoy@tsinghua.edu.cn
    • 基金项目: 国家重点基础研究发展计划(批准号:2013CB632804,2012CB315605)、国家自然科学基金(批准号:61176015,61210014,51002085,61321004,61307024,61176059)和国家高技术研究发展计划(批准号2015AA017101)资助的课题.
      Corresponding author: Hao Zhi-Biao, zbhao@tsinghua.edu.cn;luoy@tsinghua.edu.cn ; Luo Yi, zbhao@tsinghua.edu.cn;luoy@tsinghua.edu.cn
    • Funds: Project supported by the National Basic Research Program of China (Grant Nos. 2013CB632804, 2012CB315605), the National Natural Science Foundation of China (Grant Nos. 61176015, 61210014, 51002085, 61321004, 61307024, 61176059), and the National High Technology Research and Development Program of China (Grant No. 2015AA017101).
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    Wang L, Hao Z B, Luo Y, et al. 2015 Appl. Phys. Lett. 107 131107

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    Schnitzer I, Yablonovitch E, Caneau C, et al. 1993 Appl. Phys. Lett. 63 2174

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    Chen Y X, Shen G D, Han J R, et al. 2010 Acta Phys. Sin. 59 545 (in Chinese) [陈依新, 沈光地, 韩金茹 等 2010 物理学报 59 545]

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    FuJii T, Gao Y, Sharma R, et al. 2004 J. Appl. Phys. 84 855

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    Lee Y J, Lu T C, Kuo H C, et al. 2007 Mat. Sci. Eng: B 138 157

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    Zike L, Wei G, Chen X, et al. 2010 J. Semicond. 31 114011

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    Ma L, Jiang W J, Zou D S, et al. 2011 J. Phys: Conf. Ser. 276 012077

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    Song Y M, Choi E S, Yu J S, et al. 2009 Opt. Express. 17 20991

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出版历程
  • 收稿日期:  2015-11-23
  • 修回日期:  2016-01-19
  • 刊出日期:  2016-05-05

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