Collaborative Research: Silver-Based Colloidal Quantum Dot Devices for Ubiquitous Mid-Wavelength Infrared Sensing

合作研究：用于无处不在的中波长红外传感的银基胶体量子点器件

• 批准号: 1809112
• 负责人: Dong-Kyun Ko
• 金额: $ 23.26万
• 依托单位: New Jersey Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-08-01 至 2022-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1809112&HistoricalAwards=false
• 关键词: Collaborative; Research; Silver; Based; Colloidal

Part 1:Unlike visible or near-infrared night vision cameras, photodetectors operating in the mid-wavelength infrared (MWIR) can image through fog, mist, and other obscurants and do not require an external source of illumination as they can capture images solely by sensing the radiation that objects emit. These MWIR photodetectors that have been traditionally used for military surveillance are finding growing number of applications ranging from night driving assist, search-and-rescue, biomedical imaging, to environmental monitoring of hazardous chemicals. However, existing MWIR technologies are prohibitively expensive and ill-suited for these applications as they require cryogenic cooling to achieve high sensitivity, making the detector bulky, heavy, and consume large power. The proposed research aims to enable a disruptive photodetector technology based on newly discovered infrared colloidal quantum dots (CQDs) that will allow high temperature operation thereby removing the size, weight, and power consumption barriers to wide-scale adoption. Furthermore, the processing of CQD devices is highly compatible with mature silicon technology that will allow monolithic fabrication of photodetectors at the wafer scale leading to dramatic reduction in cost. The highly interdisciplinary nature of this project will also create unique educational opportunities for various levels of students that will help increase the pool of underrepresented minorities entering science and engineering programs at colleges and strengthen our STEM work force in the US.Part 2:The overall goal of this research is to gain a comprehensive understanding of device physics of photodiodes based on silver chalcogenide CQDs to demonstrate high temperature, high sensitivity MWIR photodiodes. Films composed of close-packed, strongly-coupled silver chalcogenide CQDs have the promising potential to enable high temperature operation of photodetectors through Auger suppression. However, the major challenges in realizing high performance CQD-based photodiodes lies in the unavailability of material combinations with suitable band alignment and the lack of understanding of device operation in photodiode structures. This research, though a progressive device study, will investigate a new method of forming heterojunctions based on two types of CQDs which will enable fine tuning of energy levels needed for achieving high device performance. Based on this approach, this project will generate fundamental understanding of Auger suppression and dark current arising from thermally generated carriers as well as carrier transport, recombination, and trapping of optically generated carriers in photodiodes. The outcomes of this project could potentially enable a low-cost, high performance MWIR sensing technology that will be ubiquitously utilized in a broad range of applications. Moreover, this MWIR CQD research, combined with existing visible, near-, and short-wavelength infrared CQDs, will directly contribute to the development of multispectral imaging focal plane arrays.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

第1部分：与可见光或近红外夜视摄像机不同，在中波长红外（MWIR）中工作的光电探测器可以通过雾，薄雾和其他遮蔽物成像，并且不需要外部照明源，因为它们可以通过感测物体发出的辐射来捕获图像。这些传统上用于军事监视的MWIR光电探测器正在发现越来越多的应用，从夜间驾驶辅助，搜索和救援，生物医学成像到危险化学品的环境监测。然而，现有的MWIR技术过于昂贵，并且不适合这些应用，因为它们需要低温冷却来实现高灵敏度，使得检测器体积庞大，重量沉重，并且消耗大功率。拟议的研究旨在实现基于新发现的红外胶体量子点（CQD）的颠覆性光电探测器技术，该技术将允许高温操作，从而消除大规模采用的尺寸，重量和功耗障碍。此外，CQD器件的处理与成熟的硅技术高度兼容，这将允许以晶片规模单片制造光电探测器，从而大幅降低成本。该项目的高度跨学科的性质也将创造独特的教育机会，为不同层次的学生，这将有助于增加池的代表性不足的少数民族进入科学和工程专业的大学和加强我们的干劳动力在美国。第2部分：本研究的总体目标是获得一个全面的了解光电二极管的器件物理的基础上银硫属化合物CQD，以展示高温，高灵敏度MWIR光电二极管。由紧密堆积、强耦合的银硫族化合物CQD构成的膜具有通过俄歇抑制使光电探测器能够高温操作的有希望的潜力。 然而，实现高性能CQD光电二极管的主要挑战在于没有合适的能带对准的材料组合，以及缺乏对光电二极管结构中器件操作的理解。这项研究虽然是一项渐进的器件研究，但将研究一种基于两种类型的CQD形成异质结的新方法，这将能够微调实现高器件性能所需的能级。基于这种方法，该项目将产生俄歇抑制和暗电流所产生的热产生的载流子，以及载流子传输，复合和光生载流子在光电二极管中的捕获的基本理解。 该项目的成果可能使低成本，高性能的MWIR传感技术，将在广泛的应用中无处不在。此外，该MWIR CQD研究，结合现有的可见光，近，短波红外CQD，将直接有助于多光谱成像焦平面阵列的发展。该奖项反映了NSF的法定使命，并已被认为是值得通过使用基金会的智力价值和更广泛的影响审查标准进行评估的支持。

项目成果

Vertically Stacked Intraband Quantum Dot Devices for Mid-Wavelength Infrared Photodetection

• DOI: 10.1021/acsami.0c19450
• 发表时间: 2021-01-13
• 期刊: ACS APPLIED MATERIALS & INTERFACES
• 影响因子: 9.5
• 作者: Hafiz, Shihab Bin;Al Mahfuz, Mohammad M.;Ko, Dong-Kyun
• 通讯作者: Ko, Dong-Kyun

Mid-Wavelength Infrared Responsivity of Colloidal Quantum Dot/Organic Hybrid Photodetectors

胶体量子点/有机混合光电探测器的中波长红外响应度

• DOI: 10.1149/09701.0109ecst
• 发表时间: 2020
• 期刊: ECS Transactions
• 作者: Hafiz, Shihab Bin;Al Mahfuz, Mohammad Mostafa;Ko, Dong-Kyun
• 通讯作者: Ko, Dong-Kyun

(Invited) Mid-Infrared Colloidal Quantum Dot Based Nanoelectronics and Nano-Optoelectronics

（特邀）中红外胶体量子点纳米电子学与纳米光电子学

• DOI: 10.1149/09201.0011ecst
• 发表时间: 2019
• 期刊: ECS Transactions
• 作者: Hafiz, Shihab Bin;Scimeca, Michael R.;Sahu, Ayaskanta;Ko, Dong-Kyun
• 通讯作者: Ko, Dong-Kyun

Silver Selenide Colloidal Quantum Dots for Mid-Wavelength Infrared Photodetection

• DOI: 10.1021/acsanm.9b00069
• 发表时间: 2019-03-01
• 期刊: ACS APPLIED NANO MATERIALS
• 影响因子: 5.9
• 作者: Hafiz, Shihab B.;Scimeca, Michael R.;Ko, Dong-Kyun
• 通讯作者: Ko, Dong-Kyun

Intraband Quantum Dot Barrier Devices - Optimization of Energy Level Alignment

带内量子点势垒器件 - 能级对准的优化

• DOI: 10.1149/10201.0045ecst
• 发表时间: 2021
• 期刊: ECS Transactions
• 作者: Hafiz, Shihab Bin;Al Mahfuz, Mohammad M.;Ko, Dong-Kyun
• 通讯作者: Ko, Dong-Kyun