Performance Optimization of Hg1-xCdxTe Photovoltaic Detectors Under Strong Illumination Considering Temperature and Wavelength Dependencies

IF 2.1 4区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC IEEE Photonics Journal Pub Date : 2024-09-30 DOI:10.1109/JPHOT.2024.3470871
Jiahui Chen;Wangyong Chen;Linlin Cai;Pengling Yang;Dahui Wang;Manling Shen;Xiangyang Li;Hui Qiao
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Abstract

Currently, HgCdTe detectors are advancing towards very long wavelengths and room temperature operation. However, as operating temperatures and illumination intensity increase, the performance of these detectors deteriorates, evidenced by increased dark current, reduced responsivity and detectivity, and enhanced saturation effects. These limitations significantly hinder the application of detectors for strong illumination scenarios at room temperature. In this study, we utilize compositional gradients and array electrode designs to make better trade-offs among dark current, responsivity, and saturation characteristics of HgCdTe photovoltaic detectors under mid-wave and long-wave infrared conditions. We elucidate the underlying mechanisms from the perspectives of the responsive region and the non-photosensitive area, as well as carrier motion and recombination processes. The results indicate that increasing compositional gradients are beneficial for reducing dark current, while decreasing compositional gradients are advantageous for improving responsivity. Moreover, detectors with array electrodes design achieve a peak responsivity of 1.5 A/W under 200 W/cm 2 (∼1.8 mW) at room temperature, which is three times higher than the pre-optimized structure. Additionally, the peak detectivity increased by more than 20%. These research findings provide guidance for the design of future HgCdTe detectors operating under strong injection levels and at various temperatures.
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考虑温度和波长相关性的强光照条件下 Hg1-xCdxTe 光电探测器的性能优化
目前,碲化镉汞探测器正朝着超长波长和室温操作的方向发展。然而,随着工作温度和光照强度的增加,这些探测器的性能会下降,表现为暗电流增加、响应率和探测率降低以及饱和效应增强。这些限制极大地阻碍了探测器在室温下强照明场景中的应用。在本研究中,我们利用成分梯度和阵列电极设计,更好地权衡了中波和长波红外条件下 HgCdTe 光电探测器的暗电流、响应率和饱和特性。我们从响应区和非光敏区以及载流子运动和重组过程的角度阐明了其基本机制。结果表明,增加成分梯度有利于减少暗电流,而减少成分梯度则有利于提高响应度。此外,采用阵列电极设计的探测器在室温条件下 200 W/cm2 (1.8 mW)的峰值响应率为 1.5 A/W,比预先优化的结构高出三倍。此外,峰值检测率提高了 20% 以上。这些研究成果为未来在强注入水平和不同温度下工作的碲化镉汞探测器的设计提供了指导。
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来源期刊
IEEE Photonics Journal
IEEE Photonics Journal ENGINEERING, ELECTRICAL & ELECTRONIC-OPTICS
CiteScore
4.50
自引率
8.30%
发文量
489
审稿时长
1.4 months
期刊介绍: Breakthroughs in the generation of light and in its control and utilization have given rise to the field of Photonics, a rapidly expanding area of science and technology with major technological and economic impact. Photonics integrates quantum electronics and optics to accelerate progress in the generation of novel photon sources and in their utilization in emerging applications at the micro and nano scales spanning from the far-infrared/THz to the x-ray region of the electromagnetic spectrum. IEEE Photonics Journal is an online-only journal dedicated to the rapid disclosure of top-quality peer-reviewed research at the forefront of all areas of photonics. Contributions addressing issues ranging from fundamental understanding to emerging technologies and applications are within the scope of the Journal. The Journal includes topics in: Photon sources from far infrared to X-rays, Photonics materials and engineered photonic structures, Integrated optics and optoelectronic, Ultrafast, attosecond, high field and short wavelength photonics, Biophotonics, including DNA photonics, Nanophotonics, Magnetophotonics, Fundamentals of light propagation and interaction; nonlinear effects, Optical data storage, Fiber optics and optical communications devices, systems, and technologies, Micro Opto Electro Mechanical Systems (MOEMS), Microwave photonics, Optical Sensors.
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