Design rule of indium bump in infrared focal plane array for longer cycling life |
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| Affiliation: | 1. School of Information Engineering, Henan University of Science and Technology, Luoyang 471023, China;2. China Academy Key Laboratory of Science and Technology on Infrared Detector, China Airborne Missile Academy, Luoyang 471009, China;3. Henan Xuji Metering Co., Ltd., Xuchang 461000, China;1. Department of Photonics Engineering, Yuan Ze University, 135, Yuan Tung Road, Chungli 320, Taiwan, Republic of China;2. Department of Physics, Fu Jen University, 510, Zhongzheng Road, Xinzhuang District, New Taipei 242, Taiwan, Republic of China;3. Department of Electrical Engineering, Yuan Ze University, 135, Yuan Tung Road, Chungli 320, Taiwan, Republic of China;1. School of Engineering and Information Technology, The University of New South Wales, Canberra, ACT 2600, Australia;2. Deakin University Geelong, School of Engineering, VIC 3216, Australia;1. Changchun University of Science and Technology, Weixing Road, Changchun 130022, China;2. Department of Public Security of Jilin Province, Changchun 130051, China |
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| Abstract: | In light of the proposed equivalent method, a three-dimensional structural modeling of InSb infrared focal plane arrays (IRFPAs) is created, and the simulated strain distribution is identical to the deformation distribution on the top surface of InSb IRFPAs. After comparing the deformation features at different regions with the structural characteristics of IRFPAs, we infer that the flatness of InSb IRFPAs will be improved with a thinner indium bump array, and this inference is verified by subsequent simulation results. That is, when the diameter of indium bump is smaller than 20 μm, the simulated Z-components of strain on the whole top surface of InSb IRFPAs is uniform, and the deformation amplitude is small. When the diameter of indium bump is larger than 28 μm, the simulated Z-components of strain increases rapidly with the thicker indium bump, and the flatness of InSb IRFPAs is worsened rapidly. According to the changing trend of deformation amplitude with diameters of indium bump, and employing element pitches normalization method, a design rule of indium bump is proposed. That is, when the diameter of indium bump is shorter than 0.4 times the element pitch, the flatness of InSb IRFPAs is in an acceptable range. This design rule was supported by different IRFPAs with different formats delivered by several main research groups for achieving a longer cycling life. |
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| Keywords: | Infrared focal plane arrays Thermal deformation Thinner indium bump Longer cycling life |
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