异质衬底外延碲镉汞薄膜位错抑制技术进展  

Research Progress of Dislocation Density Reduction in MBE HgCdTe on Alternative Substrates

作　　者：杨晋 李艳辉[1] 杨春章[1] 覃钢[1] 李俊斌 雷文 孔金丞[1] 赵俊[1] 姬荣斌[1] YANG Jin;LI Yanhui;YANG Chunzhang;QIN Gang;LI Junbin;LEI Wen;KONG Jincheng;ZHAO Jun;JI Rongbin(Kunming Institute of Physics,Kunming 650223,China)

机构地区：[1]昆明物理研究所,云南昆明650223

出　　处：《红外技术》2022年第8期828-836,共9页Infrared Technology

基　　金：核高基重大专项项目。

摘　　要：分子束外延碲镉汞技术是制备第三代红外焦平面探测器的重要手段,基于异质衬底的碲镉汞材料具有尺寸大、成本低、与常规半导体设备兼容等优点,是目前低成本高性能红外探测器发展中的研究重点。对异质衬底上碲镉汞薄膜位错密度随厚度的变化规律进行了建模计算,结果显示ρ~1/h 模型与实验结果吻合度好,异质衬底上原生碲镉汞薄膜受位错反应半径制约,其位错密度无法降低至 5×10^(5)cm^(-2)以下,难以满足长波、甚长波器件的应用需求。为了有效降低异质外延的碲镉汞材料位错密度,近年来出现了循环退火、位错阻挡和台面位错吸除等位错抑制技术,本文介绍了各技术的原理及进展,分析了后续发展趋势及重点。循环退火和位错阻挡技术突破难度大,发展潜力小,难以将碲镉汞位错密度控制在 5×10cm以内。台面位错吸除技术目前已经显示出了巨大的发展潜力和价值,后续与芯片工艺融合后,有望大幅促进低成本长波、中长波、甚长波器件的发展。HgCdTe has dominated the high-performance IR detector market for decades. Owing to its numerous merits, including precise energy band structure control and device structure growth, the MBE(molecular beam epitaxy) growth of HgCdTe has become the main tool for fabricating third-generation IR focal plane arrays. CdZnTe is widely considered to be an ideal substrate for HgCdTe epitaxy because of the matched lattice through Zn fraction adjustment. Therefore, HgCdTe/CdZnTe has a high crystal quality with a typical etch pit density in the range of 1×10^(4)–1×10^(5)cm^(-2). However, several limitations, such as high cost,small wafer size, and low yield, still exist in the (211) CdZnTe substrate, which results in high cost and limits the array format size in infrared detectors based on HgCdTe/CdZnTe. Compared with CdZnTe substrates,alternative substrates (e.g., Si, Ge, GaAs, and GaSb) have large wafer size, low cost, and convenience in standard semiconductor equipment, which have the potential to fabricate low-cost high-performance focal plane arrays. The main issue in HgCdTe on alternative substrates is the large lattice mismatch between the substrate and epi-layer (19.3%, 14.3%, 14.4%, and 6.1% for Si, Ge, GaAs, and GaSb, respectively), which is responsible for the high dislocation density of 10~6–10~7 cmin HgCdTe films. The high dislocation density hampers the application of this material to long-wavelength and very long-wavelength infrared detectors.The variation in dislocation density with film thickness in the as-grown HgCdTe film grown on an alternative substrate was modeled, and the results from the ρ~1/h law agreed well with the experimental data. This indicates that the dislocation annihilation radius is the leading cause of impeding the dislocation density below 5×10~6 cmin HgCdTe;thus, dislocation reduction is urgently needed. Moreover, the theory and research progress on three dislocation reduction methods, namely thermal cycle annealing (TCA), dislocation blocking,and mesa dislocation gettering (MDG),

关 键 词：碲镉汞 异质衬底 位错抑制 循环退火 位错阻挡 台面位错吸除 

分 类 号：TN304[电子电信—物理电子学]