{"title":"Performance Optimization of Hg1-xCdxTe Photovoltaic Detectors Under Strong Illumination Considering Temperature and Wavelength Dependencies","authors":"Jiahui Chen;Wangyong Chen;Linlin Cai;Pengling Yang;Dahui Wang;Manling Shen;Xiangyang Li;Hui Qiao","doi":"10.1109/JPHOT.2024.3470871","DOIUrl":null,"url":null,"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\n<sup>2</sup>\n (∼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.","PeriodicalId":13204,"journal":{"name":"IEEE Photonics Journal","volume":null,"pages":null},"PeriodicalIF":2.1000,"publicationDate":"2024-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10700044","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"IEEE Photonics Journal","FirstCategoryId":"5","ListUrlMain":"https://ieeexplore.ieee.org/document/10700044/","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ENGINEERING, ELECTRICAL & ELECTRONIC","Score":null,"Total":0}
引用次数: 0
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.
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.